Mar 26

SQL PRIMARY KEY Constraint

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The PRIMARY KEY constraint uniquely identifies each record in a database table.

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Mar 19

SQL UNIQUE Constraint

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The UNIQUE constraint uniquely identifies each record in a database table.

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Mar 12

SQL NOT NULL Constraint

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The NOT NULL constraint enforces a column to NOT accept NULL values.

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Mar 05

SQL Constraints

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Constraints are used to limit the type of data that can go into a table.

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