mysql – 在多个表中为同一个键选择多个值

我在以下结构中有两个表

表格1

uid | name | age
1   | John | 24
2   | Adam | 35
3   | Sara | 26

TABLE_2

id | uid | meta_key | meta_value
1  | 2   | location | NY
2  | 2   | school   | NYU
3  | 3   | Location | NY
4  | 3   | school   | XYZ
6  | 1   | location | NY
6  | 1   | school   | NYU

我想要做的是从table_1选择他们的位置是纽约,学校是纽约大学的用户

这是我尝试使用的查询没有运气

SELECT
  tabl_1.uid
FROM `tabl_1`, `tabl_2`
WHERE
  tabl_1.uid = tabl_2.uid
  AND table_2.meta_key IN ('location', 'school')
  AND table_2.meta_value IN ('NY', 'NYU')
ORDER BY tabl_1.uid ASC

如果您有一个可行的查询或者一个非常感谢的解决方案的链接,我已经无处运气地到处寻找,谢谢.

解决方法:

你应该试试

SELECT t1.uid
FROM tabl_1 t1 INNER JOIN tabl_2 t2
ON t1.uid = t2.uid AND t2.meta_key = 'location' AND t2.meta_value = 'NY'
INNER JOIN tabl_2 t3
ON t1.uid = t3.uid AND t3.meta_key = 'school' AND t3.meta_value = 'NYU'

检查结果http://sqlfiddle.com/#!2/f35ef/1/0

标签：multiple-tables,mysql
来源： https://codeday.me/bug/20190831/1776820.html