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The DROP Statement in SQL: Overview             You use the DROP statement in SQL to delete created database objects. You can use the DROP statement in SQL to delete databases, tables and indexes. You can also use the DROP statement in SQL in conjunction with the ALTER TABLE statement to delete fields

NULL Values in SQL: Overview             When creating tables in SQL, you will need to deal with NULL values in SQL. A NULL value is a value that is unknown. These values can occur within database tables when a user who is performing data entry skips entering a value into a field. When a value

The UPDATE Statement in SQL: Overview             After you have data within the tables in your database, you will often need to update those records. SQL uses the UPDATE statement to update field data within specified records in a table. The core SQL of the UPDATE statement is shown below. Note that the “table_name” parameter

The SELECT Statement in SQL: Overview             You use the SELECT statement in SQL to choose specific records to view from a table, or from related tables, within a temporary table called a result set. We will start the examination of the SELECT statement by looking at the SELECT statement in its simplest form when

CREATE DATABASE Statement: Overview             Within many relational database management systems, the CREATE DATABASE statement is used to create the database. The core SQL of the statement is shown below. CREATE DATABASE database_name             In this statement, the “database_name” parameter is the name you want to give to the database. Note that while most versions

The UNION Operator in SQL- Tutorial

Wednesday, 11 February 2015 by

The UNION Operator in SQL: Overview             The UNION operator in SQL allows you to combine the result sets of two or more individual SELECT statements into a single result set. Note that the UNION operator in SQL is not a JOIN, but rather a way to combine the data within two result sets into

The DELETE Statement in SQL: Overview             The DELETE statement in SQL is used to remove specified records from a table. Like the UPDATE statement, it includes a WHERE clause that you should ensure is correct before executing the DELETE statement in SQL. If you do not specify a WHERE clause within the DELETE statement

DROP USER and DROP ROLE Statements in SQL: Overview             This blog post discusses using the DROP USER and DROP ROLE statements in SQL. You can use the DROP USER statement in SQL to delete a user from the database. Note that this statement is technically classified as Data Definition Language (DDL), as it defines

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