摘要： 寫法一 select * from T_User A join T_Dep B and A.DepID = B.DepID where A.UserID = 'A01' 寫法二 select * from T_User A join T_Dep B and A.DepID = B.DepID and A.UserID = 'A01' 對於這二個SQL 返回的資料是相同的，但是從效能來講 寫法... 阅读全文