Question

我需要添加一个检查约束，如果另一个值小于3，则需要一个值为0。好到目前为止我得到了答案，但它没有安装到我的数据库中。这是我的测试表和数据：

CREATE TABLE dbo.YourTable(Col1 INT, Col2 INT);

insert into YourTable (Col1,Col2) SELECT 0, 5
insert into YourTable (Col1,Col2) SELECT 1, 5
insert into YourTable (Col1,Col2) SELECT 0, 3
insert into YourTable (Col1,Col2) SELECT 0, 11
insert into YourTable (Col1,Col2) SELECT 0, 4
insert into YourTable (Col1,Col2) SELECT 0, 145
insert into YourTable (Col1,Col2) SELECT 0, 10
insert into YourTable (Col1,Col2) SELECT 0, 1
insert into YourTable (Col1,Col2) SELECT 0, 6
insert into YourTable (Col1,Col2) SELECT 0, 6
insert into YourTable (Col1,Col2) SELECT 0, 2
insert into YourTable (Col1,Col2) SELECT 0, 5
insert into YourTable (Col1,Col2) SELECT 1, 3
insert into YourTable (Col1,Col2) SELECT 0, 10
insert into YourTable (Col1,Col2) SELECT 0, 10


ALTER TABLE dbo.YourTable ADD CONSTRAINT TestConstraint 
CHECK ((Col1 = 0 AND Col2 <= 3) OR Col2 > 3)

Answer 1

CREATE TABLE dbo.YourTable(Col1 INT, Col2 INT);

ALTER TABLE dbo.YourTable ADD CONSTRAINT TestConstraint 
CHECK ((Col1 = 0 AND Col2 <= 3) OR Col2 > 3);

针对2列的SQL检查约束

1 个答案: