SQL DROP CONSTRAINT Keyword

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SQL DROP CONSTRAINT Keyword


❮ SQL Keywords Reference


DROP CONSTRAINT


The DROP CONSTRAINT command is used to delete
a UNIQUE, PRIMARY KEY, FOREIGN KEY, or CHECK constraint.



DROP a UNIQUE Constraint


To drop a UNIQUE constraint, use the following SQL:



SQL Server / Oracle / MS Access:




ALTER TABLE Persons

DROP CONSTRAINT UC_Person;



MySQL:




ALTER TABLE Persons

DROP INDEX UC_Person;



DROP a PRIMARY KEY Constraint


To drop a PRIMARY KEY constraint, use the following SQL:



SQL Server / Oracle / MS Access:




ALTER TABLE Persons

DROP CONSTRAINT PK_Person;



MySQL:




ALTER TABLE Persons

DROP PRIMARY KEY;



DROP a FOREIGN KEY Constraint


To drop a FOREIGN KEY constraint, use the following SQL:



SQL Server / Oracle / MS Access:




ALTER TABLE Orders

DROP CONSTRAINT FK_PersonOrder;



MySQL:




ALTER TABLE Orders

DROP FOREIGN KEY FK_PersonOrder;



DROP a CHECK Constraint


To drop a CHECK constraint, use the following SQL:


SQL Server / Oracle / MS Access:




ALTER TABLE Persons

DROP CONSTRAINT CHK_PersonAge;



MySQL:




ALTER TABLE Persons

DROP CHECK CHK_PersonAge;



❮ SQL Keywords Reference


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