SQL Constraints

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SQL constraints are basically used to specify the rules for the data in a table. Here is the general form to define constraints on columns:

CREATE TABLE table_name
column_name1 data_type(size) constraint_name,
column_name2 data_type(size) constraint_name,
column_name3 data_type(size) constraint_name,

SQL Constraints List

Here are the list of constraints available in SQL:

SQL Online Test

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