check constraint in sql

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showing results for - "check constraint in sql"
Elena
02 Sep 2018
1ALTER TABLE <table>
2ADD CONSTRAINT chk_val CHECK (col in ('yes','no','maybe'))
Alberto
02 Sep 2019
1CREATE TABLE Persons (
2    ID int NOT NULL,
3    LastName varchar(255) NOT NULL,
4    FirstName varchar(255),
5    Age int,
6    City varchar(255),
7    CONSTRAINT CHK_Person CHECK (Age>=18 AND City='Sandnes')
8);
Agustina
09 Mar 2017
1CREATE TABLE test(
2    _id BIGINT PRIMARY KEY NOT NULL,
3    decision NVARCHAR(5),
4    CHECK (decision in ('yes','no','maybe'))
5);
Rogelio
09 Oct 2019
1#Add Check
2ALTER TABLE Persons
3ADD CONSTRAINT CHK_PersonAge CHECK (Age>=18 AND City='Sandnes');
4
5#Drop Check 
6ALTER TABLE Persons
7DROP CHECK CHK_PersonAge;
Victoria
23 Mar 2019
1#For one column
2CREATE TABLE Persons (
3    ID int NOT NULL,
4    LastName varchar(255) NOT NULL,
5    FirstName varchar(255),
6    Age int CHECK (Age>=18)
7);
Sara
13 Oct 2017
1/*Adding Check constraint in sql server*/
2ALTER TABLE (Table_Name)
3ADD CONSTRAINT (Constraint_Name) CHECK (Boolean_Expression) 
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