仅在满足条件的情况下检查语句

Question

我必须创建一个表，仅在满足其他条件时才需要检查条件。

准确地说，我有一个带有“已解决”和“价格”列的表“修复”，如果“已解决”列的值为0，我需要检查“价格”列是否也等于0。

如何在create table语句中执行此操作？

Answer 1

我认为您正在寻找

ALTER TABLE Repair
ADD CONSTRAINT MyConstraint CHECK((Solved = 0 AND Price = 0) OR (Solved <> 0 AND Price <> 0));

如何在create table语句中执行此操作？

CREATE TABLE Repair(
  Solved BIT NOT NULL,
  Price DECIMAL(19,4) NOT NULL,
  CONSTRAINT MyConstraint CHECK((Solved = 0 AND Price = 0) OR (Solved <> 0 AND Price <> 0))
);