SQL server條件唯一約束 - 復合鍵

Question

我有一種情況，我需要對一組列強制執行唯一約束，但只對列的一個值。 假設有一個名為Person的表，列'Name'和'isActive'以下應該是結果

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行不應該重復。

Answer 1

嘗試過濾的唯一索引 ：

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