如何計算表中每一行的行數？
[英]How count rows for each rows in table?
問題描述
我從table1:獲取行table1:
SELECT table1.id, COUNT(commentTable1.id) AS CNT3, COUNT(photoTable1.id) AS CNT2, COUNT(fileTable1.id) AS CNT3 FROM table1
LEFT JOIN commentTable1 ON...
LEFT JOIN photoTable1 ON...
LEFT JOIN fileTable1 ON ...
如何正確地為每個COUNT使用GROUP BY ？ 現在我弄錯了CNT3數量
1 個解決方案
解決方案1
0 已采納 2014-12-13 20:06:32
您無法按計數分組，所以我假設您正在按table1.id分組
SELECT table1.id, COUNT(commentTable1.id) AS CNT3, COUNT(photoTable1.id) AS CNT2, COUNT(fileTable1.id) AS CNT3 FROM table1
LEFT JOIN commentTable1 ON...
LEFT JOIN photoTable1 ON...
LEFT JOIN fileTable1 ON ...
GROUP BY table1.id
如何列出表中的所有行並從與每行相關的多個表中計數？
[英]How can I list all rows in table and count from multiple table that related with each rows?
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.