SQL server条件唯一约束 - 复合键

Question

我有一种情况，我需要对一组列强制执行唯一约束，但只对列的一个值。假设有一个名为Person的表，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

基本上我需要的是同名和active = 1行不应该重复。

Answer 1

试试filtered unique index：

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