＃1052-where子句中的列'bookingId'不明确

Question

我想和两张桌子合影，但是我遇到了问题

这是我的sql语法

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

这是我出错了

1052-where子句不明确的列'bookingId'

Answer 1

为Save使用别名

b.bookingId = 9

Answer 2

将联接和别名用作bookinid列，因为该列在两个表中均可用

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