Question

好的，所以我有一个查询我正在尝试构建..我有2个表，table1有一堆常规记录正常，具有唯一ID（自动增量），table2有记录，包括来自table1的一些ID 。我试图通过表1中具有相同ID的最高记录进行排序。这是我得到的：

SELECT * FROM table1 
WHERE table1.status = 1 
AND (SELECT COUNT(*) FROM table2 WHERE table2.tbl1_id = table1.id) 
ORDER BY table1.id DESC

谢谢：）

Answer 1

SELECT table1.id 
FROM table1 
LEFT JOIN table2 ON table2.tbl1_id = table1.id
WHERE table1.status = 1 
GROUP BY table1.id
ORDER BY COUNT(table2.tbl1_id) DESC

Answer 2

试试这个：

SELECT a.*, b.cnt
  FROM table1 a LEFT JOIN
    (
        SELECT tbl1_id, COUNT(*) cnt
            FROM table2
        GROUP BY tbl1_id
    ) b
 ON a.id = b.tbl1_id  
WHERE table1.status = 1 
ORDER BY cnt DESC

按行排序

2 个答案: