限制sql查詢和排名總計

Question

我有一個SQL查詢我的MYSQL數據庫，並希望限制結果只有10個銷售人員，而不是20.我試圖在查詢中插入他們的名字，但不斷收到錯誤。也可以根據總數排名。我使用的SQL查詢：

select sales_id, totalbuy, totalsell, totalbuy + totalsell as total from 
(select sales_id, SUM(CASE WHEN side= 'buy' THEN 1 ELSE 0 END) AS totalbuy, 
SUM(CASE WHEN side= 'sell' THEN 1 ELSE 0 END) AS totalsell 
from sales_id where sales_id='sales1', GROUP BY sales_id)q 

，它說的銷售額1我已經嘗試了其餘9個sales_ids'使用逗號和單引號補充，但不能讓它開始工作。

Answer 1

如果您只需要某些sales_id，請使用「IN」子句。

如果你想只有前10總，刪除了這一行，並使用極限

select sales_id, totalbuy, totalsell, totalbuy + totalsell as total from 
(select owner_id, SUM(CASE WHEN side= 'buy' THEN 1 ELSE 0 END) AS totalbuy, 
SUM(CASE WHEN side= 'sell' THEN 1 ELSE 0 END) AS totalsell 
from sales_id 
where sales_id in ('sales1', 'sales2', 'sales3', 'sales4')-- if you wanna certain sales_id only 
GROUP BY sales_id)q 
order by total desc 
limit 0, 10;--top 10 by total (bigger first)