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The best SQL CHECK Constraint Tutorial In 2024, In this tutorial you can learn SQL CHECK Constraint,SQL CHECK constraint CREATE TABLE when,SQL CHECK constraint ALTER TABLE when,Undo CHECK constraint,
SQL CHECK Constraint
SQL CHECK Constraint
CHECK constraint is used to limit the range of values in the column.
If you define a CHECK constraint on a single column, then the specific value of the column allows only.
If a table definition CHECK constraint, then the constraint rows based on the values of other columns in a particular column of the limit values.
SQL CHECK constraint CREATE TABLE when
The following SQL when the "Persons" table is created to create a CHECK constraint on the "P_Id" column. CHECK constraints specify "P_Id" column must contain only an integer greater than 0.
MySQL:
(
P_Id int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255),
CHECK (P_Id>0)
)
SQL Server / Oracle / MS Access:
(
P_Id int NOT NULL CHECK (P_Id>0),
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255)
)
To name a CHECK constraint, and define a plurality of column CHECK constraint, use the following SQL syntax:
MySQL / SQL Server / Oracle / MS Access:
(
P_Id int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255),
CONSTRAINT chk_Person CHECK (P_Id>0 AND City='Sandnes')
)
SQL CHECK constraint ALTER TABLE when
When the table has been created, create columns for CHECK constraints "P_Id", please use the following SQL:
MySQL / SQL Server / Oracle / MS Access:
ADD CHECK (P_Id>0)
To name a CHECK constraint, and define a plurality of column CHECK constraint, use the following SQL syntax:
MySQL / SQL Server / Oracle / MS Access:
ADD CONSTRAINT chk_Person CHECK (P_Id>0 AND City='Sandnes')
Undo CHECK constraint
To drop a CHECK constraint, use the following SQL:
SQL Server / Oracle / MS Access:
DROP CONSTRAINT chk_Person
MySQL:
DROP CHECK chk_Person
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