SQL(postgresql?

Question

我想知道，第一次join后左table和右table是什么组成

例如：

From final_productions fp
             left join things.pc p on fp.production_id = p.id
             left join events.time t on fp.tx_id = t.id
             left join things.car c on c.id = fp.channel_id
             right join events.form f on f.production_id = p.id
             left join events.trigger_alert ta on mc.cue_sheet_id = ta.id

我知道第一个左连接 inner join things.pc p on fp.production_id = p.id 左 table 将是 from statement 中的 table，即 final_productions。但是其他连接（即第一个连接语句之后的连接）呢？有人可以解释一下吗？谢谢

Answer 1

The documentation 说：

Parentheses can be used around JOIN clauses to control the join order. In the absence of parentheses, JOIN clauses nest left-to-right.

所以

a LEFT JOIN b RIGHT JOIN c

与

相同

(a LEFT JOIN b) RIGHT JOIN c

SQL(postgresql?

What is the left and right table for joins after the first join in SQL(postgresql?

postgresql

join