Question

这个MySQL查询返回3行，但我想只选择total_votes = max(total_votes);的那一行，请告诉我该怎么办？

SELECT 
      assembly, 
      seat_code, 
      CONCAT(first_name, ' ', last_name), 
      total_votes, 
      party_id      
FROM (polling JOIN seat USING (seat_id) JOIN candidate USING (candidate_id))
WHERE seat_id = 1;

Answer 1

从

替换您的查询

SELECT 
      assembly, 
      seat_code, 
      CONCAT(first_name,' ',last_name), 
      total_votes, 
      party_id      
FROM (polling JOIN seat USING (seat_id) JOIN candidate USING (candidate_id))
WHERE seat_id=1;

到

SELECT 
      assembly, 
      seat_code, 
      CONCAT(first_name,' ',last_name), 
      total_votes, 
      party_id      
FROM (polling JOIN seat USING (seat_id) JOIN candidate USING (candidate_id))
WHERE seat_id=1 AND total_votes=(SELECT MAX(total_votes) FROM <table name>);

Answer 2

您可以使用MAX聚合：

SELECT 
      assembly, 
      seat_code, 
      CONCAT(first_name,' ',last_name)name, 
      MAX(total_votes)total_votes, 
      party_id      
FROM polling JOIN seat USING (seat_id) JOIN candidate USING (candidate_id)
WHERE seat_id=1;

注意：无需在JOIN部分放置括号。

如何获取具有列的最大值的行

2 个答案: