Question

如何在mysql中对同一个字段进行多次计数？下面的单个计数代码可以正常工作

SELECT fruit, COUNT(DISTINCT site) AS `apple` FROM grocery where fruit like '%06201%'

然而，当我尝试过这个但是我得到语法错误

SELECT
    SUM(fruit like '%06201%') AS `apple`,
    SUM(fruit like '%02206%') AS `pears`,
FROM grocery

Answer 1

SELECT
    SUM(fruit like '%06201%') AS `apple`,
    SUM(fruit like '%02206%') AS `pears`,
                                        ^
                                        here
FROM grocery

你有两个逗号，但你只需要一个。

Answer 2

在FROM

之前删除额外的逗号

SELECT
    SUM(fruit like '%06201%') AS `apple`,
    SUM(fruit like '%02206%') AS `pears`
FROM grocery

单个mysql查询中的多个计数

2 个答案: