Question

我遇到一种情况，我需要对一组列强制执行唯一约束，但仅对列的一个值执行。假设有一个名为Person的表，且列“ Name”和“ isActive” 以下应该是结果

INSERT INTO Person (name,isActive) VALUES ('testUser1',0); --Success
INSERT INTO Person (name,isActive) VALUES ('testUser1',1); --Success
INSERT INTO Person (name,isActive) VALUES ('testUser1',0); --Success
INSERT INTO Person (name,isActive) VALUES ('testUser1',1); --Failure
INSERT INTO Person (name,isActive) VALUES ('testUser1',0); --Success

INSERT INTO Person (name,isActive) VALUES ('testUser2',0); --Success
INSERT INTO Person (name,isActive) VALUES ('testUser2',1); --Success
INSERT INTO Person (name,isActive) VALUES ('testUser2',0); --Success
INSERT INTO Person (name,isActive) VALUES ('testUser2',1); --Failure
INSERT INTO Person (name,isActive) VALUES ('testUser2',0); --Success

基本上我需要的是相同的名称和active = 1行，不应重复。

Answer 1

尝试filtered unique index：

create unique index index_name on Person (name) where isActive = 1

SQL Server条件唯一约束-复合键

1 个答案: