#1052 - where 子句中的列“bookingId”不明確

Question

我想加入兩張桌子，但我遇到了問題

這是我的 SQL 語法

select * from booking as b,
booking_detail as bd 
WHERE bookingId = 9 AND b.bookingId = bd.bookingId

這是我得到的錯誤：

#1052 - where 子句中的列 'bookingId' 不明確

Answer 1

使用b.bookingId = 9的別名

select * from booking as b join 
booking_detail as bd on b.bookingId = bd.bookingId
WHERE b.bookingId = 9 

Answer 2

對 bookinid 列使用連接和別名，因為該列在兩個表中都可用

select * from booking as b join
 booking_detail as bd 
 on b.bookingId = bd.bookingId
  WHERE b.bookingId = 9