您好我很难完成此查询...
如何获得这些结果？
我有3个表...我只是想这样返回但是我的代码错误地认为子查询只返回1 ...
例如我有这个..
"emergency_codes"
---------------------
| id | name |
---------------------
| 1 | Fire |
| 2 | crime |
| 3 | Medical Need |
"ec_type"
-------------------------------------
| id | ec_id | type |
-------------------------------------
| 1 | 1 | eruf |
| 2 | 2 | eruf |
| 3 | 3 | eruf |
| 4 | 2 | police |
| 5 | 3 | hospital |
| 6 | 1 | firecontrol |
我的Expected Result
"rescue_units"
-------------------------------------
| id | name | type |
-------------------------------------
| 1 | eruf1 | eruf |
| 2 | firecontrol1 | firecontrol |
| 4 | eruf2 | eruf |
| 8 | firecontrol2 | firecontrol |
到目前为止，我试过......
SELECT * from rescue_units WHERE type LIKE (SELECT type FROM ec_type WHERE ec_id = (SELECT id FROM emergency_codes WHERE id = 1 ))