MySQL：返回COUNT（*）大于的字段

Question

我有以下SQL，但我只想返回'hits'大于10的行。

SELECT clicks.affiliate, COUNT(*) AS hits, affiliates.title, affiliates.url
FROM clicks
INNER JOIN affiliates ON affiliates.id = clicks.affiliate
GROUP BY clicks.affiliate

感谢。

Answer 1

要按聚合过滤，您需要使用having子句。与许多RDBMS不同，MySQL确实允许您在此上下文中使用列别名（大多数其他RDBMS也会坚持将affiliates.title, affiliates.url添加到group by子句中

SELECT clicks.affiliate, COUNT(*) AS hits, affiliates.title, affiliates.url
FROM clicks
INNER JOIN affiliates ON affiliates.id = clicks.affiliate
GROUP BY clicks.affiliate
HAVING hits > 10

Answer 2

SELECT clicks.affiliate, COUNT(*) AS hits, affiliates.title, affiliates.url
FROM clicks
INNER JOIN affiliates ON affiliates.id = clicks.affiliate
GROUP BY clicks.affiliate
HAVING COUNT(*) > 10

Answer 3

 ...
HAVING hits > 10