General MySQL Oracle SQL Server

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What Is a Subquery in a SELECT Query Statement in SQL Server
What Is a Subquery in a SELECT Query Statement in SQL Server? A subquery is a SELECT statement used as part of the selection criteria of the main SELECT statement. The subquery specified in the WHERE clause will be evaluated repeated on each row of the selection base table. The output of the subquer... 2016-10-29, 2455🔥, 0💬

mssql_query() - Executing SQL Statements
How To Execute a SQL Statement using mssql_query()? Once you have created a connection object, you can use the mssql_query() function to send a SQL statement to the SQL Server linked to the connection object for execution. Here is a simple PHP script that creates a new schema and a new table: &l... 2024-04-07, 2453🔥, 0💬

mssql_result() - Retrieve Field Values
How To Retrieve Field Values using mssql_result()? Once the result set is captured in an object, you can think of it as a "table" with rows and columns (fields). You can use mssql_result() to retrieve the value of any given row and column (field) with this formats: $value = mssql_result($res, $row, ... 2024-03-23, 2451🔥, 0💬

Installing DTS on Windows XP Systems
How To Install DTS (Data Transformation Services) on Windows XP Systems? SQL Server 2000 is not supported on Windows XP systems, but you can still install DTS (Data Transformation Services) as client component your XP system. This allows you to continue to use DTS with SQL Server 2005, if you don't ... 2024-01-31, 2446🔥, 0💬

PHP MSSQL - Inserting Multiple Rows with a Subquery
PHP MSSQL - How To Insert Multiple Rows with a subquery? If want to insert rows into a table based on data rows from other tables, you can use a subquery inside the INSERT statement as shown in the following script example: &lt;?php $con = mssql_connect('LOCALHOST','sa' ,'FYIcenter');mssql_selec... 2024-02-28, 2428🔥, 0💬

"DROP TRIGGER" - Deleting Existing Triggers in SQL Server
How To Delete Existing Triggers using "DROP TRIGGER" in SQL Server? If you don't want to use a trigger any more, you should delete it from the database by using the "DROP TRIGGER" statement as shown in tutorial example: USE FyiCenterData; GO DROP TRIGGER new_user; GO SELECT * FROM sys.triggers GO na... 2016-10-24, 2415🔥, 0💬

PHP ODBC - Inserting Multiple Rows with a Subquery
PHP ODBC - How To Insert Multiple Rows with a subquery? If want to insert rows into a table based on data rows from other tables, you can use a subquery inside the INSERT statement as shown in the following script example: &lt;?php $con = odbc_connect('FYI_SQL_SERVER', 'sa','FYIcenter');$sql = "... 2024-05-29, 2410🔥, 0💬

PHP MSSQL - Including Date and Time Values in SQL Statements
PHP MSSQL - How To Include Date and Time Values in SQL Statements? If you want to provide date and time values in a SQL statement, you should write them in the format of "yyyy-mm-dd hh:mm:ss", and quoted with single quotes ('). The tutorial exercise below shows you two INSERT statements. The first o... 2024-02-18, 2410🔥, 0💬

PHP MSSQL - Including Text Values in SQL Statements
PHP MSSQL - How To Include Text Values in SQL Statements? Text values in SQL statements should be quoted with single quotes ('). If the text value contains a single quote ('), it should be protected by replacing it with two single quotes (''). In SQL language syntax, two single quotes represents one... 2024-02-18, 2407🔥, 0💬

mssql_select_db() - Selecting an Exiting Database
How To Select an Exiting Database using mssql_select_db()? The first thing after you have created a connection object to the SQL Server is to select the database where your tables are located, by using the mssql_select_db() function. If your MSSQL server is offered by your Web hosting company, they ... 2024-04-07, 2406🔥, 0💬

Preparing Data in Text Files for DTS to Import
How To Prepare Data in Text Files for DTS to Import? Sometimes you have data organized in rows and columns and stored in text files. You can import data from text files to SQL Server database tables using the DTS wizard. But you need to prepare data text files with the following questions in mind: W... 2024-01-19, 2402🔥, 0💬

Copying a Table from Source to Destination
How To Copy a Table from Source to Destination? If the DTS data source is set to a SQL Server, you have two options to transform data from source to destination: Copy all rows and columns of a table or view. Generating data by a SELECT query statement. This tutorial continues from previous tutorials... 2024-01-31, 2392🔥, 0💬

DENSE_RANK() - Density Rank of Sorted Values
How to calculate the density rank of the sorting field expression in the current result set window using the DENSE_RANK() function? DENSE_RANK() is a MySQL built-in window function that calculates the density rank of the sorting field expression in the current result set window. For example: SELECT ... 2024-09-28, 2376🔥, 0💬

PHP MSSQL - Deleting Existing Rows in a Table
PHP MSSQL - How To Delete Existing Rows in a Table? If you want to remove a row from a table, you can use the DELETE statement with a WHERE clause to identify the row. The following sample script deletes one row: &lt;?php $con = mssql_connect('LOCALHOST','sa' ,'FYIcenter');mssql_select_db('FyiCe... 2024-02-18, 2375🔥, 0💬

FORMAT_PICO_TIME() - Formatting Picoseconds in Readable Units
How to format a number of picoseconds in a human-readable unit using the FORMAT_PICO_TIME() function? FORMAT_PICO_TIME(con) is a MySQL built-in function that converts a number of picoseconds in a human-readable unit of ps, ns, ms, s, min, h, or d. For example: SELECT FORMAT_PICO_TIME(9), FORMAT_PICO... 2025-09-24, 2373🔥, 0💬

Defining SQL Server 2005 as the DTS Data Source
How To Define SQL Server 2005 as the DTS Data Source? If you want to transform (export) data out of a SQL Server 2005 database table, you need to configure the DTS data source to connect the SQL Server 2005 server. The tutorial exercise below shows you how to connect to the local SQL Server 2005 ser... 2024-01-31, 2372🔥, 0💬

PHP MSSQL - Updating Existing Rows in a Table
PHP MSSQL - How To Update Existing Rows in a Table? Updating existing rows in a table requires to run the UPDATE statement with a WHERE clause to identify the row. The following sample script updates one row with two new values: &lt;?php $con = mssql_connect('LOCALHOST','sa' ,'FYIcenter');mssql_... 2024-02-18, 2358🔥, 0💬

Defining Excel Files as the DTS Data Destination
How To Define Excel Files as the DTS Data Destination? Microsoft Excel is a nice tool to view and manage data in rows and columns. If you have a small database table, you may want to export its data to an Excel file so that you can make changes easily. This tutorial is a continuation of the previous... 2024-01-31, 2349🔥, 0💬

PHP MSSQL - Making Columns to Take NULL
PHP MSSQL - How To Make a Column Nullable? Based on the testing result from the previous tutorial you can find out that there is a big difference in the column definition when running CREATE TABLE statement with mssql_query(): If CREATE TABLE is executed through mssql_query() and "NULL/NOT NULL" key... 2024-03-07, 2347🔥, 0💬

PHP MSSQL - Creating an Identity Column
PHP MSSQL - How To Create an Identity Column? Many tables require an ID column to assign a unique ID number for each row in the table. For example, if you have a table to hold forum member profiles, you need an ID number to identify each member. To allow SQL Server to automatically assign a new ID n... 2024-02-09, 2347🔥, 0💬

Defining Text Files as the DTS Data Source
How To Define Text Files as the DTS Data Source? If your data text file is ready to import, you can start the DTS wizard and define the text file as the data source following this tutorial: 1. Start the DTS wizard and click Next. The data source window shows up. 2. Select "Text File" as the Data Sou... 2024-01-19, 2347🔥, 0💬

PHP MSSQL - Computing Date and Time Differences
PHP MSSQL - How To Display a Past Time in Days, Hours and Minutes? You have seen a lots of Websites are displaying past times in days, hours and minutes. If you want to do this yourself, you can use the DATEDIFF() SQL function The following tutorial exercise shows you how to use DATEDIFF() to presen... 2024-02-18, 2346🔥, 0💬

mssql_fetch_array() - Looping through Result Set Objects
How To Loop through Result Set Objects using mssql_fetch_array()? If the returning output of a query statement is captured in a result set object, you can use mssql_fetch_array() to loop through each row in the output. The tutorial PHP script below shows you how to list tables in the database: &... 2024-03-23, 2338🔥, 0💬

PHP MSSQL - Returning Result Set Objects
PHP MSSQL - What Is a Result Set Object Returned by mssql_query()? A result set object is a logical representation of data rows returned by mssql_query() function on SELECT statements. Every result set object has an internal pointer used to identify the current row in the result set. Once you get a ... 2024-02-28, 2336🔥, 0💬

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General MySQL Oracle SQL Server