[英]MYSQL count in select statement
I have data in database like this 我有像这样的数据库中的数据
id class gender 1 A F 2 B F 3 A M 4 A F 5 A M 6 B M 7 A F
From this data I want to make select statement to produce report like this 从这个数据我想制作select语句来生成这样的报告
_________________________ Gender class M F Total _________________________ A 2 3 5 B 1 1 2 _________________________ TOTAL 3 4 7
How can I make that select statement ? 我该怎么做那个选择陈述?
Have a look at the following example 看看下面的例子
SELECT class,
SUM(CASE WHEN gender = 'M' THEN 1 ELSE 0 END) `M`,
SUM(CASE WHEN gender = 'F' THEN 1 ELSE 0 END) `F`,
COUNT(1) Total
FROM Table1
GROUP BY class
To get totals for each gender: 要获得每个性别的总计:
SELECT class, gender, COUNT(*) as gender_count
FROM Gender
GROUP BY class, gender;
To get total: 要得到总数:
SELECT class, COUNT(*) as total_count
FROM Gender
GROUP BY class;
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