Nilai Periksa Kendala SQL Dalam Daftar
ALTER TABLE <table>
ADD CONSTRAINT chk_val CHECK (col in ('yes','no','maybe'))
Breakable Barracuda
ALTER TABLE <table>
ADD CONSTRAINT chk_val CHECK (col in ('yes','no','maybe'))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')
);CREATE TABLE test(
_id BIGINT PRIMARY KEY NOT NULL,
decision NVARCHAR(5),
CHECK (decision in ('yes','no','maybe'))
);#For one column
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int CHECK (Age>=18)
);CREATE TABLE Orders (
order_id INT PRIMARY KEY,
amount int CHECK (amount >= 100)
);#Add Check
ALTER TABLE Persons
ADD CONSTRAINT CHK_PersonAge CHECK (Age>=18 AND City='Sandnes');
#Drop Check
ALTER TABLE Persons
DROP CHECK CHK_PersonAge;