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SQL is designed for the retrieval and management of information in relational database. SQL stands for Structured Query Language.

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SQL

SQL Alter Table

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The SQL ALTER TABLE is used to add, delete or modify columns in an existing table.
SQL Alter Table:-
ALTER TABLE table_name ADD column_name datatype

Drop Column:-

ALTER TABLE table_name DROP COLUMN column_name;

Add Unique Constraint:-

ALTER TABLE table_name ADD CONSTRAINT MyUniqueConstraint UNIQUE(column1, column2…);

Add Primary Key:-

ALTER TABLE table_name ADD CONSTRAINT PrimaryKey PRIMARY KEY (column1, column2…);

Also Read :   SQL Like
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