[英]How to get sum of records of female candidate whose age is less than 50 using MySQL query
這是一個帶有JOIN
的簡單聚合查詢:
SELECT SUM(votes) total_votes
FROM results r
INNER JOIN candidates c
ON c.id = r.candidate_id
AND c.gender = 'F'
AND c.age < 50
您可能希望將<
更改為<=
,具體取決於您的意思是小於50 歲。
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.