Question

我有两个表，每个表包含超过一百万行。这两个表看起来像这样; 表1

student_id     student_name
001            mark
002            moses
003            mike
004            john
005            jeff
006            joe

和表2

student_id   height   weight
001          170      80      
002          130      88
003          190      90
004          150      75
005          200      85
006          180      78

如果他们的身高在150厘米到200厘米之间，那么返回前4个体重的学生应该是什么意思;像这样的东西

student_id      student_name         weight
003             mike                 90 
005             jeff                 85
001             mark                 80
006             joe                  78

我尝试过类似的东西，但它不起作用;

SELECT a.student_id AS `Student ID`, a.student_name AS `Student Name`, b.weight
FROM table1 AS a
RIGHT JOIN 
    (
        SELECT student_id 
        FROM table2 
        WHERE height BETWEEN 150 AND 200 ORDER BY weight DESC LIMIT 4
    ) AS b
ON b.student_id
WHERE a.student_id IN b.student_id

任何达到所需结果的方法都受到高度赞赏。提前谢谢！

Answer 1

我使用的是SQL Server，但我认为这应该有用......

SELECT table2.student_id as 'Student ID',
       table1.student_name AS 'Student Name', 
       table2.weight
FROM table2 
INNER JOIN table1 ON table1.student_id = table2.student_id 
WHERE table2.height BETWEEN 150 AND 200 
ORDER BY table2.weight DESC 
LIMIT 4

Answer 2

我会使用LEFT JOIN IE

SELECT a.student_id, a.student_name, b.weight 
FROM table1 a
  LEFT JOIN table2 b
  ON a.student_id = b.student_id
WHERE b.hieght 
   BETWEEN 150 
   AND 200 
ORDER BY b.weight DESC LIMIT 4;

子查询上的SQL RIGHT JOIN没有工作

2 个答案: