SQL

SQL ALTER TABLE statement

Jun 27,92

The ALTER TABLE statement is used to update database table definitions. For example, to add a column in a table, …

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SQL DROP statement

Jun 26,92

The SQL DROP statement permanently removes database objects such as tables, views, or indexes. To drop a database, use the …

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SQL Constraints

Jun 26,92

SQL Constraints are rules which regulates how database data is inserted or manipulated. They are usually used to prevent a user from storing …

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SQL CREATE TABLE statement

Jun 26,92

The SQL CREATE TABLE statement is used to create tables. To create a table using this statement, you must specify the …

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SQL CREATE DATABASE statement

Jun 26,92

Usually DBMSs include an administration tool that can be used to create, manage database and tables. Database can also be created with the SQL …

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SQL UNION operator

Jun 25,92

The SQL UNION operator is used to combine multiple SELECT statements into one result set. The syntax: SELECT column_name FROM …

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