Check constraint in sql

Sql constraint check value in list

ALTER TABLE <table>
ADD CONSTRAINT chk_val CHECK (col in ('yes','no','maybe'))

Source: stackoverflow.com

Check constraint in sql

CREATE TABLE Persons (
    ID int NOT NULL,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int,
    City varchar(255),
    CONSTRAINT CHK_Person CHECK (Age>=18 AND City='Sandnes')
);

Sql constraint check value in list

CREATE TABLE test(
    _id BIGINT PRIMARY KEY NOT NULL,
    decision NVARCHAR(5),
    CHECK (decision in ('yes','no','maybe'))
);

Source: stackoverflow.com

Check constraint in sql

#For one column
CREATE TABLE Persons (
    ID int NOT NULL,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int CHECK (Age>=18)
);

Check constraint in sql

#Add Check
ALTER TABLE Persons
ADD CONSTRAINT CHK_PersonAge CHECK (Age>=18 AND City='Sandnes');

#Drop Check 
ALTER TABLE Persons
DROP CHECK CHK_PersonAge;

Check constraint in ms sql

/*Adding Check constraint in sql server*/
ALTER TABLE (Table_Name)
ADD CONSTRAINT (Constraint_Name) CHECK (Boolean_Expression)

Similar codes

1 vote307 views1 answer
Select users with same username
SQL
1 vote300 views1 answer
Random name function in mysql for nvarchar
SQL
0 vote269 views1 answer
Mysql select all where count more than"
SQL
1 vote297 views1 answer
Search for replace in mysql
SQL
1 vote297 views1 answer
Mysql how to truncate table with foreign keys
SQL
1 vote294 views1 answer
ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
SQL
0 vote297 views1 answer
Sql shell psql cannot enter password
SQL
1 vote294 views2 answers
Test sqlsrv connection
SQL
0 vote291 views1 answer
VSCode SQL Server Connection error
SQL
1 vote284 views1 answer
Importance of comment in mysql
SQL