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Data Query Language (or simply DQL) consists of commands that perform data selection, which is the main focus of relational database users in the...
Data Manipulation Language (or simply DML) consists of SQL commands that handle data maintenance functions. This means that you can manipulate the...
In this post, we shall gain an understanding of the commands in DDL using CREATE, ALTER, and DROP. CREATE CREATE Statement The numerous forms of the...
Since a database is a collection of information, it can store names, numbers, images, calculations, financial amounts, characters and so on. This...
Stored Procedure is a block of code given a name which is stored in the database. This block of code can include: SQL Queries DML, DCL, DDL, and TCL...
The not-null constraint Disallow null values in a certain column Must hold true for the current state Must hold true for future state -- Disallow...
