General MySQL Oracle SQL Server

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Types of Execution Flow Control Statements in Oracle
What Are the Execution Control Statements in Oracle? PL/SQL supports three groups of execution control statements: IF Statements - Conditionally executes a block of statements. CASE Statements - Selectively executes a block of statements. LOOP Statements - Repeatedly executes a block of statements. ... 2018-11-17, 2426🔥, 0💬

Deleting Multiple Rows with One DELETE Statement in SQL Server
How To Delete Multiple Rows with One DELETE Statement in SQL Server? You can delete multiple rows from a table in the same way as deleting a single row, except that the WHERE clause will match multiple rows. The tutorial exercise below deletes 3 rows from the fyi_links table: -- view rows to be dele... 2016-10-30, 2426🔥, 0💬

PHP ODBC - Updating Existing Rows in a Table
PHP ODBC - 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 $con = odbc_connect('FYI_SQL_SERVER', 'sa','FYIcenter');$sq... 2024-05-29, 2425🔥, 0💬

Update Values on Multiple Rows in Oracle
How To Update Values on Multiple Rows in Oracle? If the WHERE clause in an UPDATE matches multiple rows, the SET clause will be applied to all matched rows. This rule allows you to update values on multiple rows in a single UPDATE statement. Here is a good example: UPDATE fyi_links SET counts = 9, n... 2020-01-21, 2425🔥, 0💬

Filter Out Duplications in Returning Rows in Oracle
How To Filter Out Duplications in Returning Rows in Oracle? If there are duplications in the returning rows, and you want to remove the duplications, you can use the keyword DISTINCT or UNIQUE in the SELECT clause. The tutorial exercise below shows you that DISTINCT works on selected columns only: S... 2019-12-19, 2424🔥, 0💬

Query with a Right Outer Join in MySQL
How To Write a Query with a Right Outer Join in MySQL? If you want to query from two tables with a right outer join, you can use the RIGHT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a right outer join from two tables: fyi_links and fyi_rates. The join condit... 2017-09-28, 2424🔥, 0💬

PHP ODBC - Deleting Existing Rows in a Table
PHP ODBC - 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 $con = odbc_connect('FYI_SQL_SERVER', 'sa','FYIcenter');$sql = "DELETE FROM... 2024-05-05, 2423🔥, 0💬

What Is Transaction in MySQL
What Is Transaction in MySQL? A transaction is a logical unit of work requested by a user to be applied to the database objects. MySQL server introduces the transaction concept to allow users to group one or more SQL statements into a single transaction, so that the effects of all the SQL statements... 2016-10-16, 2423🔥, 0💬

Categories of Functions Based on Return Modes in SQL Server
How Many Categories of Functions based Their Return Modes in SQL Server Transact-SQL? SQL Server supports 2 categories of user defined functions based on their return modes: 1. Scalar-valued Functions - A function that returns a single value. Scalar-valued functions can be used in scalar expressions... 2016-12-18, 2422🔥, 0💬

Entering Numeric Values as HEX Numbers in MySQL
How To Enter Numeric Values as HEX Numbers in MySQL? If you want to enter numeric values as HEX numbers, you can quote HEX numbers with single quotes and a prefix of (X), or just prefix HEX numbers with (0x). A HEX number string will be automatically converted into a numeric value, if the expression... 2018-03-31, 2420🔥, 0💬

Expressions with NULL Values in MySQL
What Happens If NULL Values Are Involved in Expressions in MySQL? If NULL values are used in expressions, the resulting values will be NULL values. In other words: Arithmetic expressions with NULL values result NULL values. Comparison expressions with NULL values result NULL values. Logical expressi... 2018-03-28, 2420🔥, 0💬

Giving User Read-only Access in MySQL
How To Give a User Read-Only Access to a Database in MySQL? If you want give a user read-only access to a database, you can grant to him/her only the "SELECT" privilege, so that he/she can not run any DDL statements, and any INSERT, UPDATE, or DELETE statements. The tutorial exercise gives you a goo... 2017-08-21, 2420🔥, 0💬

Creating a New Table in a Given Schema in SQL Server
How To Create a New Table in a Given Schema in SQL Server? When you create a new table, you can specify in which schema you want this table to be located by prefixing the table name with the schema name. In the tutorial example below, a new table "test" is created in schema "fyi": USE FyiCenterData;... 2016-10-22, 2420🔥, 0💬

Commonly Used ODBC Functions in PHP
What Are Commonly Used ODBC Functions in PHP? If you look at the PHP 5 manual, you will see a group of functions listed under the ODBC Functions (Unified) section. The commonly used ODBC functions are: odbc_connect � Establish an OBDC connection. odbc_data_source � Returns information about a curren... 2024-03-17, 2417🔥, 0💬

Deleting a User Account in MySQL
How To Delete a User Account in MySQL? If you want to delete a user account, you can connect to the server as "root" and use the "DROP USER ..." command to delete a user account. The tutorial exercise below shows you a good example: &gt;cd \mysql\bin &gt;mysql -u root -pretneciyf mysql mysql... 2017-12-13, 2417🔥, 0💬

mssql_connect() - Connecting to Different Port Numbers
How To Connect with Different Port Numbers? You know that SQL Server could be configured to accept connections with different TCP/IP port numbers. See other tutorial collections on how to view and configure SQL Server TCP/IP protocol. If you installed SQL Server 2005 Express Edition with default set... 2024-04-14, 2416🔥, 0💬

IN - Testing Values Returned by a Subquery in SQL Server
How To Test Values Returned by a Subquery with the IN Operator in SQL Server Transact-SQL? Normally, the comparison operator IN is used against a list of specified values as in the format of: "test_value IN (value_1, value_2, ..., value_n)". But you can also replace the list of values by a subquery ... 2017-01-21, 2416🔥, 0💬

odbc_fetch_row() - Looping through Result Set Objects
How To Loop through Result Set Objects using odbc_fetch_row()? If the returning output of a query statement is captured in a result set object, you can use odbc_fetch_row() to loop through each row in the output. The tutorial PHP script below shows you how to list tables in the database: &lt;?ph... 2024-06-30, 2414🔥, 0💬

How Data Locks Are Respected in Oracle
How Data Locks Are Respected in Oracle? Here are the rules on how data locks are respected: All statements ignore data locks owned its own transaction. SELECT query statements ignores data locks owned by any transactions. INSERT, UPDATE, and DELETE statements in a READ COMMITTED transaction will wai... 2019-08-08, 2414🔥, 0💬

PHP ODBC - Creating a New Table
PHP ODBC - How To Create a New Table? If you want to create a table in the database connected through a ODBC DSN, you can run the CREATE TABLE SQL statement using the odbc_exec() function, as shown in the following sample script: &lt;?php $con = odbc_connect('FYI_SQL_SERVER', 'sa','FYIcenter');#... 2024-06-03, 2412🔥, 0💬

Requirements to Use ODBC Connections in PHP
What Are the Requirements to Use ODBC Connections in PHP Scripts? If you are planning to use ODBC connections to access SQL Server databases in PHP scripts, you need to check the following requirements: The PHP engine must support ODBC functions. If you install PHP 5.2.2 from The PHP Group, the ODBC... 2024-03-17, 2412🔥, 0💬

LIKE - Matching a Pattern in a Character String in SQL Server
What To Perform Pattern Match with the LIKE Operator in SQL Server Transact-SQL? Pattern match is a very important operation for search records base on character string columns. SQL Server 2005 offers the LIKE operator to perform pattern match operations in two formats: target_string LIKE pattern --... 2017-01-21, 2412🔥, 0💬

Defragmenting Table Indexes in SQL Server
How To Defragment Table Indexes in SQL Server? When a table index is fragmented to a certain percentage, you need to defragment the index to maintain its performance level. There are 3 ways to defragment: 1. "ALTER INDEX index_name ON table_name REORGANIZE" - Defragmenting the specified index perfor... 2016-11-08, 2412🔥, 0💬

Retrieve Field Values from RECORD Variables in Oracle
How To Retrieve Values from Data Fields in RECORD Variables in Oracle? If a variable is a RECORD variable with data fields assigned values, you can retrieve those values out of its data fields by using fields names prefixed with variable name as "variable.field_name". Here is a sample script showing... 2018-09-01, 2411🔥, 0💬

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General MySQL Oracle SQL Server