這篇文章介紹SQL 的 HAVING 函數和 WHERE 的差異，並試著用 HAVING 搭配 COUNT 找出重複的資料項目。 HAVING 介紹. 有使用聚合函數(例如 SUM ) 計算 ... ... <看更多>

Get all my courses for USD 5.99/Month - https://bit.ly/all-courses-subscriptionIn this SQL Tutorial, we will learn about SQL HAVING clause. ... <看更多>

WHERE clause introduces a condition on individual rows; HAVING clause introduces a condition on aggregations, i.e. results of selection where a single ... ... <看更多>

It is a mistake to use them 'as is' in the HAVING clause, but it is possible to use other column names like this: ... <看更多>