从子查询中选择多个值

Is it possible to select multiple values from a subquery in SELECT block?

是否可以从select块中的子查询中选择多个值?

Selecting one value works fine like this:

选择一个值可以这样工作:

SELECT
  a.id,
  (SELECT b.id FROM b WHERE b.a_id = a.id) AS b_id
FROM
  a

But if i also want to get the b.name and i change the query to this:

但是如果我也想要得到b。name并将查询改为:

SELECT
  a.id,
  (SELECT b.id, b.name FROM b WHERE b.a_id = a.id)
FROM
  a

... it doesn't work anymore. One possibility would be to put the subquery to FROM block and take values from there but in my particular query that doesn't work so i would like to solve in SELECT block. Thank you!

…它不工作了。一种可能是将子查询放到block中并从那里获取值，但是在我的特定查询中，它不能工作，所以我想在SELECT block中解决这个问题。谢谢你！

1 个解决方案

#1

This will help you

这将帮助你

SELECT A.ID,
       B.ID,
       B.NAME
FROM   A INNER JOIN B ON B.A_ID=A.ID;