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Introduction to PHP timezone

PHP timezone function is an inbuild function of PHP which is mostly used for setting up some default values with timezone that will be further used by all the functions related to date or time. There are some special characteristics about PHP timezone like the script in PHP timezone will return false in case timezone is not valid and it comes out to be true other way round. This function accepts single argument which is considered a mandatory argument and arguments more than one like multi-function argument is not a must for making PHP timezone working.

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Syntax

bool date_default_timezone_set( $timezone_id )

The syntax flow is in way where the bool signifies the boolean value and the function passes some parameters like:

It is a must that this function will include single parameter like timezone_id which will be responsible for setting up the parameter with the required date or time inclined with UTC timings of ASIA or KOLKATA.

In case the function returns value as false then that timezone id will be invalid to consider and true otherwise.

How timezone Function works in PHP?

Every function has a working pattern so do timezone function in PHP which functions in the following way:

timezone function is an inbuild function in PHP which is mostly used for setting the values with respect to the values given but still it needs some more setting and the patterns as per requirement.

Also, there are other methods with timezone including setting up the PHP timezone function with setTimeZone and getTimeZone.

Version compatibility in PHP also plays a pivotal role like it should be above 5 with its own pros and cons.

Date_timezone_set function is used exclusively for setting the timezone with Date Time Object which means it sets for the new DateTimeObject.

DateTime::setData function as part of Timezone function resets the current DateTime Object to a different date and time.

This timezone function involves usage of both date and time which means that the date used will be fetched from the date

Once this date or time function set up is done then the format for both the date and time function can be modified and can be made updated in different ways and format.

Also, the function depends on many local setups of the server with the daylight-saving time and leap years into consideration.

For setting up local server and the environment it is very much needed to make this PHP function as part of PHP pre-installation phase which means no third-party installation is required for making use of PHP functions.

This behavior of functions gets affected or changed whenever the function with chúng tôi is used for manipulation with the added aid of timezone.

timezone_abbreviations_list() function is mostly used for returning an associative array containing destination, offset, and any timezone name.

This function is used for accepting a single parameter for manipulation which involves timezone_identifier to make traversal within the function.

The return type is in boolean format with consideration of fact that it can be either true or false depending on the function requirement.

After PHP Version more than 5 which means PHP version with 5 and above will have calls made to date and time by generating E_NOTICE which is a kind of acknowledgement with the fact that the user is receiving a valid or true notice as a message.

If in case the end user receives or get some invalidated or false response as E_Warning then the system settings with the TZ environment variable will receive acknowledgment in warning format.

This is not the only option to make PHP timezone in working format rather an alternative to this procedure can be made with the INI default settings with time zone i.e. by setting the date time with date.timezone to set default timezone.

The timezone identifier plays an important role with the fact that timezone related to identifiers will be according to the locations and it can be in the form of UTC timing like Africa, Asia, Europe etc.

Versions with 5.1.2 supports for the function having validation for the timezoneID parameter whereas the version 5.3.0 supports for acknowledgement with E_Warning rather than E_strict statements.

Date_default_timezone_get() helps in getting the default timezone that will be aided with the date and time format present in the script.

Examples of PHP timezone

Given below are the examples of PHP timezone:

Example #1

This program demonstrates the way to represent default timezone to get the value set up with the default timezone according to India and USA as shown in the output.

Code:

<?php date_default_timezone_set(‘India/USA’); $sc_tz = date_default_timezone_get(); if (strcmp($sc_tz, ini_get(‘date.timezone’))) { echo ‘ini_timezone varies from the ini_timezone present in the script.’; } else { echo ‘Both the timezone including ini and script matches with each other.’; }

Output:

Example #2

Code:

<?php $dt = new DateTime(‘2023-08-05’, new DateTimeZone(‘Europe/London’));

Output:

Example #3

This program demonstrates the creation of date using date_create() function from abbreviation list to make the entire list of function working with the created date as shown in the output.

Code:

<?php $dt=date_create(); echo date_timestamp_get($dt);

Output:

Example #4

This program demonstrates the date with timestamp to get created and then representing it as shown in the output.

Code:

<?php $dt=date_create(); date_timestamp_set($dt,12167845); echo date_format($dt,”U = Y-m-d H:i:s”);

Output:

Conclusion

PHP timezone function is a very useful inbuild function related to time and date which is primarily used whenever the use requires to implement the functionality related to date and time. Also, the PHP timezone blends well once timezone is confirmed for affirmation and reflection in terms of setting and getting the time uniformly.

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How Row_Number() Function Works In Redshift?

Introduction to Redshift ROW_NUMBER() Function

Redshift row_number() function usually assigns a row number to each row by means of the partition set and the order by clause specified in the statement. If the partitioned rows have the same values then the row number will be specified by order by clause.

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ROW_NUMBER() OVER ( [PARTITION BY column_partition_expression, ... ]

Here in the above syntax, we can say that based on the partition by expression the row sets are divided for the result set of the partition by expression the function will be applied.

Order by is used to logically sort order of the rows in each partition either in ascending or descending order.

Syntax:

ROW_NUMBER() OVER ( [PARTITION BY column_partition_expression, ... ]

Arguments of the above syntax:

( )

The function takes no arguments, but the empty parentheses are required.

OVER

The window clauses for the ROW_NUMBER function.

PARTITION BY partition_expression

It can be Optional. In ROW_NUMBER function One or more expressions can be defined in partition by.

ORDER BY sort_expression

It can be Optional. Order by uses the entire table if no partition by is specified.

How row_number() function work in Redshift?

Let us create a table and apply the Rank function to see how its working:

);

Now let us insert few duplicated values as below and apply rank on it.

insert into row_number_function values ('Product 3', 40)

Now let us select the above table.

SELECT * FROM row_number_function;

The above statement returns all the values in the table.

In the output of the table row_number_function. Now let us apply the row_number() function on the “row_number_function“ table.

FROM row_number_function;

Screenshot for the same:

Now let us only apply only the order by on the “alphabet” column without any partition applied. Let us check the output and difference same.

FROM row_number_function;

Screenshot for the same:

In the above output as there is no partition by expression given. The row number will be given based on the order by expression.

FROM row_number_function;

Screenshot for the above statement output:

Now in the above output only the partition by has been applied on the basis of the column ‘sale_quantity’ the row number will be ascending order by default and consider the partition by expression.

Example

Now let us consider a real-time example and apply the ROW_NUMBER function and check for the output:

Let us create the table “CUST_DATA” with columns cust_id, cust_name, cust_address, cust_phone, cust_salary as below:

cust_S int );

Let us insert few rows in the above table as below and apply the rank function:

select * from CUST_DATA;

Now let us apply row number function in the table “CUST_DATA”.

from CUST_DATA;

Output:

cust_id cust_n cust_a cust_p cust_s row_number_value

6 Bentley B Italy 7877845678 95090 1

9 Shames S London 0979809890 43768 1

4 Ben B London 8879812345 45098 2

1 Sam S USA 9987956479 45110 1

10 Harry H USA 9877890876 56789 2

10 Harry H USA 9877890876 56789 3

8 Sian S USA 6579899887 65345 4

8 Sian S USA 6579899887 65345 5

7 Sony S USA 8979800998 75123 6

3 Will W Germany 9679854678 85330 1

Screenshot is below:

Now let us apply row number function in the table “CUST_DATA” without any partition by.

from CUST_DATA;

Screenshot for the above output:

from CUST_DATA;

Here we have given only the partition by and not the order by. So the ordering will be done by default of the ascending of cust_address column.

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How Count Function Works In Sqlite?

Definition of SQLite COUNT Function

SQLite provides the various kinds of aggregation functions to the user and one of those aggregation functions is provided by the SQLite database. The SQLite count () function is an aggregate function that is used to fetch the total number of rows from the table by using the specified expression and conditions. Basically, the SQLite count () function has a capacity to work with nonnull numeric values, it is used to fetch the total of how many times column exits the nonnull values in the column and that is based on the specified expression. In SQLite count () function, if specified expression contains the asterisk character (*) at that time count () function fetch the number rows dependent on specified aggregate group or condition.

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Syntax:

select count (DISTINCT or all specified expression) from specified table name [WHERE specified condition] [GROUP BY specified expression];

Explanation:

Specified Expression: Specified expression basically is nothing but the column or we can say expression and that can help us to determine how many non-null rows or values present in that table.

WHERE specified condition: Suppose we need to count how many rows are available in a specified table at that time we need to use the WHERE clause as per the requirement and it is an optional part of the syntax.

GROUP BY specified expression: Sometimes we need to find out how many rows are present in a specified table and that based on the expression at that we need to specify the GROUP BY clause and it is an optional part of the syntax.

Specified table name: It is an actual table that we need to fetch the records from the specified table.

How count function works in SQLite?

Now let’s see how the count () function works in SQLite as follows.

Basically, the SQLite count () function is an aggregate function; it works with different arguments such as WHERE, DISTINCT, ALL, and GROUP BY clauses.

When we specify the ALL argument in the SQL statement that we return all non-null values including the duplicates values and it by default parameter of SQLite if we need skip then we can easily skip.

When we use DISTINCT in the SQL statement then it returns the only unique values with non-null values. The working SQLite count () function is simple and we use it as per the requirement with different parameters or we can say that argument.

Examples

Now let’s see the different examples of SQLite count () function as follows. First, we need to create a table by using the following statement as follows.

create table emp (emp_id integer primary key. emp_first_name text, emp_last_name text, emp_salary numeric, emp_dept_id integer);

Explanation

In the above example, we use create table statement to create a new table name as emp with different attributes with different data types such as emp_id is an integer data type with primary, emp_first_name, emp_last_name, emp_salary, and emp_dept_id as shown in the above statement. The end out of the above statement we illustrated by using the following screenshot.

Now insert some records by using the following statement as follows.

insert into emp(emp_id, emp_first_name, emp_last_name, emp_salary, emp_dept_id) values (1, "Sunny","Patel", 10000, 5), (2, "Jenny", "Sharma", 20000, 2), (3, "Johan", "Gupta", 25000, 2), (4, "Vinay", "Rana", 8500, 4);

Explanation

select * from emp;

Similarly, we created another table name as emp_dept as shown in the following screenshot as follows.

select * from emp_dept;

Now we can use the SQLite count () function as follows.

If we need to count the total number of rows at that time we can use the following statement as follows.

select count (*) from emp;

Explanation

In the above example, we use the SQLite count () function, it returns all rows from the table even if null values exist in the column. The end out of the above statement we illustrated by using the following screenshot.

Now let’s see an example of SQLite count () with a group by clause as follows.

select count (*), dn.emp_dept_name from emp et, emp_dept dn where et.emp_dept_id = dn.emp_dept_id group by et.emp_dept_id;

Explanation

Now implement SQLite count () with distinct clauses as follows.

select dn.emp_dept_name, count (distinct et.emp_id) from emp et, emp_dept dn where et.emp_dept_id = dn.emp_dept_id group by et.emp_dept_id;

Explanation

Basically distinct is used to retrieve the unique records from the table, similarly, in SQLite, we can use the distinct with count () function to fetch the unique records from the table. The end out of the above statement we illustrated by using the following screenshot.

Now let’s see the example of SQLite count function with where clause as follows.

select dn.emp_dept_name, count (et.emp_id) from emp et, emp_dept dn where et.emp_dept_id = dn.emp_dept_id and dn.emp_dept_name = 'COMP' group by et.emp_dept_id;

Explanation

In SQLite, we can use where clause with count () function to fetch the rows from the specified table and that based on the expression. Suppose we need to find how many employees work in a particular department at that time we can use where by clause. The end out of the above statement we illustrated by using the following screenshot.

Conclusion

We hope from this article you have understood about the SQLite count () function. From the above article, we have learned the basic syntax of count () function and we also see different examples of count () function. We also learned the rules of count () function. From this article, we learned how and when we use SQLite count () function.

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How Autocorrelation Function Works In Matlab?

Definition of Matlab Autocorrelation

In Matlab, Autocorrelation function means a correlation between numbers in a set or series with other numbers in the same set or series separated by provided time interval. Autocorrelation is also called a serial correlation because it correlates numbers with a delayed copy of itself set or series. Autocorrelation is used in signal processing for analyzing a series of values like time-domain signals. Autocorrelation means the correlation between the observation at the current time spot and the observation at previous time spots. Autocorrelation is used to determine the terms used in the MA model. Autocorrelation is used to measure the relation between the elements’ current value and past values of the same element.

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How does Autocorrelation Function work in Matlab?

Autocorrelation measures the relation between elements’ current value and past values of the same element. There are the following steps of autocorrelation function to work in Matlab: –

Step 1: Load and read all the data from the file.

Step 2: Assign all data to a variable.

Step 3: Then, use the appropriate syntax of the ‘Matlab Autocorrelation’ function.

Step 4: then execute the code.

Examples of Matlab Autocorrelation

Lets us discuss the examples of Matlab Autocorrelation.

Example #1

In this example, we calculate the autocorrelation of random Gaussian noise in Matlab. We know that autocorrelation means matching signals with the delayed version itself. Now for random Gaussian noise, only when shift= 0 is there some autocorrelation value, and for all other cases, the autocorrelation result will be zero. Now first, we will generate random Gaussian noise in Matlab. For generating random Gaussian noise, we will use randn function in Matlab. “x= randn(1, length(t))” generates length t Gaussian sequence with mean 0 and variance 1. After that, we use the subplot and plot function to plot the random Gaussian noise signal. Here we will use the Matlab autocorrelation function to calculate the autocorrelation of random Gaussian noise in Matlab.“autocorr(x)” this syntax is used for calculating the autocorrelation of random Gaussian noise. Then subplot and plot function is used for plotting the autocorrelation of random Gaussian noise. To calculate the autocorrelation of a random Gaussian signal, execute the Matlab code.

Code : 

Output: 

Example #2

In this example, we can see how we can find the periodicity of the signal using the function. So let’s first load the data. Here we use office temperature for data. This is, by default, available in Matlab. Once we load the data, we plot the data. We use a plot function to plot the data. After the plotting data, we will find the temperature oscillates. So we take the normal temperature by using mean temperature. “normal_temp= temp -mean(temp)” ones we subtract mean temperature from temperature, we get the normal temperature. After that, we will plot the normal temperature using the plot function. so we get normal temperatures varying around zero. Now we will set sampling ‘fs’ as 24. Then we are going to create a time vector t. The t will start from 0 and go up to the length of the normal temperature. Then we use Matlab autocorrelation to find the periodicity of the signal. Then we use above syntax “[autocor, lags]= xcorr (normal_temp,3*7*fs,’coeff’)”. Here ‘autocor’ variable stores the autocorrelation matrix, and ‘lags’ this variable stores the lags between the data. ‘xcorr’ correlates between normal temperature and sampling frequency. Then we plot the data that lag/fs, and autocor plot the autocorrelation of the signal.

Code: 

plot(lags/fs,autocor);

Output:

Example #3

In this example, we calculate the autocorrelation of the input sine signal. Now we load the signal in variable ‘x.’ “x= sin(2*t)” is used to get the sine signal in Matlab. After that, we use the subplot and plot function to plot the sine signal. Here we will use the function to calculate the autocorrelation of random Gaussian noise in Matlab.“autocorr(x)” this syntax is used for calculating the autocorrelation of sine signal. Then subplot and plot function is used for plotting the autocorrelation of the sine signal.

Code:

autocorr(x)

Output: 

Conclusion

In this article, we saw the concept of Matlab autocorrelation. Basically, this function is used to measure the relation between elements’ current values and past values of the same element. Then we saw how we could find the periodicity of the signal using this function and the efficient work of the Matlab autocorrelation function.

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Learn How Xmltable Function Works In Oracle?

Introduction to Oracle XMLTABLE

Oracle XMLTABLE function is a new function added to Oracle since Oracle 10g along with other function like XQuery to its collection of XML handling APIs. Here, the XQuery will let you construct the XML data as well as relational data and query XML using the XQuery language. But the XMLTABLE function in Oracle is responsible for creating the relational tables and its columns from Oracle XQuery command query results. Generally, the XMLTABLE function will return the content of any XML document or maybe any element present in a relational table format structure. XMLTABLE is a SQL/XML function that is implemented in the FROM clause of a SQL but in combination with a driving table that contains the XML data for translating the XML data to a relational form. Hence, using this Oracle XMLTABLE function one can retrieve several information from the XML data.

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Syntax

The basic syntax for the XMLTABLE function is explained below:

The XMLTABLE function comprises one row-generating XQuery expression and in the clause COLUMNS, there exists one or more than one column-generating expression.

Before practicing the Oracle XMLTABLE function, we should know first about the XPath, where XPath implements a path expression for selecting nodes as well as a list of nodes from an xml document. Here, is the list of beneficial paths and expression which can be applied for selecting any node or nodelist from an xml document.

Expression                                                                  Description

Nodename                                          Picks all nodes having the name ‘nodename’

/                                                           Chooses from the root node

//                                                         Picks nodes in the document from the present node which equals the choice no matter where they are

.                                                          Picks the present node

..                                                          Picks the parent of the present node

@                                                         Chooses attributes

Table_element                                    Picks all nodes with the name ‘Table_element’

Table_Name/Table_Element             Chooses all table elements that are offspring of table

//Table_Element                                 Picks all table elements no matter where they exist in the document

Also, a list of predicates is stated in square brackets [….] which are applied to discover a particular node or a node that covers a definite value.

Path Expression                                                                      Result

/table_name/table_element[1]                                 Picks the initial table element which is known to be the child of the table element.

/table_name/table_element[last()]                           Picks the last table element which is known to be the child of the table element.

//table_element[@type=’admin’]                              Picks all the table elements which hold an attribute named type having a value of ‘admin’.

How XMLTABLE function works in Oracle?

The XMLTABLE operator in Oracle permits a user to fragment the XML data ahead into table rows and project table columns on to it. For this, a Cartesian product is effectually created concerning the data table and the XMLTABLE call that permits the XMLTABLE for splitting an XML document in one row into more than one row present in the final result of execution.

The table column will be recognized as the source of data using the PASSING clause. Here, the table rows are recognized through an XQuery expression separated with a slash symbol. After that, the columns are predictable onto the resulting XML fragments using the table COLUMNS clause that detects the appropriate tags through the path expression and allots the preferred table column names with the respective data types.

We should be cautious with the column names provided in the clause COLUMNS. If anything is applied other than the upper case, then they may be required to be mentioned for making a straight reference to them. It should be noticed that it is being queried using the alias of the XMLTABLE call somewhat than the consistent table alias.

Examples

Let us illustrate with few instances the Oracle XMLTABLE function using several expressions of XPath for fetching few info from the XML document as below:

XMLTABLE = (XML_namespaces_clause, XQuery_string,XMLTABLE _options)

This describes the XMLTABLE structure where the XML_namespace_clause consists as a set of XML namespace declarations that are referenced by the provided XQuery expression (XQuery_string) further computing the row and with the XPath expression in the clause PATH of the XML_Table_Column, for computing the columns for the whole XMLTABLE function.

Reading Ordernum and Orderdate of all orders

We will query the command below applying the XMLTABLE function for parsing the XML content from the person table as created which also includes few XML data:

CREATE TABLE Persons (PersonID NUMBER, data XMLTYPE);

After running the query, the table will be ready to be operated.

Output:

We can view the contents of table Persons as;

SELECT * FROM Persons;

Output:

The XML includes the person-related data thus, now we will apply the Oracle XMLTABLE function for retrieving any information from this created XML document using the XPath and XQuery string expressions as follows:

SELECT t.PersonID, x.* FROM Persons t, XMLTABLE ('/Persons/Person' PASSING chúng tôi COLUMNS Personname VARCHAR2 (30) PATH  ‘text()’ ) x WHERE y.PersonID =1;

SELECT t.PersonID, x.* FROM Persons t, XMLTABLE ('/Persons/Person' PASSING chúng tôi COLUMNS Personname VARCHAR2 (30) PATH 'personname',Profile VARCHAR2(30) PATH 'profile' ) x WHERE t.PersonID =1;

Output:

Conclusion

Oracle XMLTABLE function and operator functions actually well with small XML documents or database tables along with several rows where each one includes an insignificant XML document.

Again, whenever the XML documents get superior then the performance of the server becomes worse as equated to the manual parse technique. But when dealing with these big XML documents, the user might have to relinquish the accessibility for the XMLTable operator in favor of a labor-intensive resolution.

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How The Opendir Function Works In Perl?

Introduction to Perl opendir

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Syntax

As we have seen that opendir is a function that is used to handle operations on the directory in Perl. We have different functions available to operate on the directory. Let’s see the syntax for a better understanding of this function in detail see below;

opendir DIRHANDLE, EXPR

This is the basic syntax for the opendir function as per the Perl documentation. Here we have two parameters as the input. One is the directory handle, and another one is expression. Let’s see one practice syntax for better understanding of the function see below;

opendir(DIR, 'Your_directory_name_here') or die;

In the coming section, we will see in more detail how we can use this while programming in Perl.

How opendir function works in Perl?

As of now, we know that opendir function is used to open the directory in the Perl. In Perl programming language, we have different functions available which are used to handle operations on the directory. If we want to open a directory in Perl, then we can use this function by specifying the directory path there. Let’s see the method signature of this function we have in Perl see below;

Method signature:

opendir (DIR, $directory) or die;

Example:

#!/usr/bin/perl my $mysample = '/your/path/to/directory. ..'; opendir (DIR, $mysample) or die "Error occured, $!"; while ($myfile = readdir DIR) { }

As you can see in the above lines of code, we are using the opendir function to open the directory in Perl and to read the files; we have the readdir function available in Perl. So first, we are creating one variable which is pointing to the directory path that we actually want to read named as ‘my sample’ After this, we are calling the opendir function to perform operations on the directory. Inside this function, we are passing two-parameter as the input. The first parameter is the directory handle which will handle the output And the second parameter is the directory path of the system. After this, we would have all the results in the DIR first parameter; we can read our directory or files in the current directory pointer by the use of it. So we are using the readdir function from the Perl directory to read the directory result inside the loop; we can have our logic to read them. In this way, we are using the opendir function in Perl; by the use of it, we can open the directory and read the files.

If we talk about the return type, we have a below-mentioned point for this function in Perl :

return type: This function return a Boolean value as a result; if successful, it will return true. In case of failure, it will return false as the value.

Points to remember while working with opendir function in Perl:

This function is used to open the directory.

That means we can now access the files or sun directories that are available inside the current search directory.

This is an alternate way to access the directory information and other stiff through Perl programming; this will help us to read the files from code in Perl.

We can also return some error message if the function does not find the mentioned path. We can use one keyword named ‘die’; this can be used to throw or return some error message that the user can easily understand.

If the mentioned directory is not found and even we are also not throwing any error using ‘die’, then it will throw an exception at runtime saying ‘No such file or directory found’.

To read and close the directory, we can use readdir and closedir functions from the Perl directory library.

After successfully reading and opening the directory, we have to close the directory; otherwise, it will lead to some memory leakage.

Examples

Example:

#!/usr/bin/perl my $mydirectory = 'C:/project'; opendir (DIR, $mydirectory) or die "error while finding directory path in system, $!"; while ($myfiledemo = readdir DIR) { print "file name is ::n" print "$myfiledemon"; }

Output:

Conclusion

Opendir function is used to perform operations on the directory in Perl. We can open the directory and access the files inside it using programming by the use of this. This makes the operations on the directory easy to handle; we have so many different functions available to read, close the directory as needed.

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