CREATE UNIQUE CLUSTERED INDEX IX_F_Log ON F_Log(userId,customerId,shopId)--惟一 汇集索引
CREATE NONCLUSTERED INDEX IX_F_Log ON F_Log(userId,customerId,shopId)--不惟一 非汇集索引
CREATE UNIQUE NONCLUSTERED INDEX IX_F_Log ON F_Log(userId,customerId,shopId)--惟一 非汇集索引