sql - SQL 用 Count 和 Have 统计记录

Question

我对我认为是计算记录的简单查询有疑问：

SELECT req_ownerid, count(req_status_lender) AS total6 
FROM bor_requests
WHERE (req_status_lender = 0 AND req_status_borrower = 0) OR 
      (req_status_lender = 1 AND req_status_borrower = 1)
GROUP BY req_ownerid 
HAVING req_ownerid = 70

我认为这将计算 (req_status_lender = 0 AND req_status_borrower = 0) 和 (req_status_lender = 1 AND req_status_borrower = 1) 的所有记录，然后给我总数，但它只给我任何一个 (req_status_lender = 0 AND req_status_borrower = 0) 或 (req_status_lender = 1 AND req_status_borrower = 1)。

任何想法我做错了什么？

Answer 1

您应该HAVING仅使用该子句来限制在上面的查询中聚合的内容 - 例如，如果您想选择 aSUM(....)或COUNT(...)大于 5 的所有行，那么您将使用HAVING SUM(...) > 5

你在这里做的是一个标准WHERE条款——把它加在那里！

SELECT req_ownerid, count(req_status_lender) AS total6 
FROM bor_requests
WHERE req_ownerid = 70
      AND ((req_status_lender = 0 AND req_status_borrower = 0) OR 
           (req_status_lender = 1 AND req_status_borrower = 1))
GROUP BY req_ownerid