mssql sqlserver in 关键字在值为null的应用举例
原文: mssql sqlserver in 关键字在值为null的应用举例 转自:http://www.maomao365.com/?p=6873 摘要: 下文通过案例分析in 关键字在值为null的应用举例, 分析出not in关键字在null值产生的异常信息 如下所示: CREATE TABLE testA(keyId INT) CREATE TABLE testB(keyId INT) GO INSERT INTO testA(keyId) VALUES (1) INSERT INTO testA(keyId) VALUES (2) INSERT INTO testA(keyId) VALUES (3) GO INSERT INTO testB(keyId) VALUES (1) INSERT INTO testB(keyId) VALUES (2) INSERT INTO testB(keyId) VALUES (4) INSERT INTO testB(keyId) VALUES (NULL) GO SELECT * FROM testA WHERE keyId IN (S...