mysql - 如何创建函数过滤 PostgreSQL 到 MySQL？

Question

如何创建函数过滤PostgreSQL 到 MySQL？

我尝试如下，但失败了：

select
    CASE WHEN statusstorie = false and statusTwentyFive = true and category not in ('goals') and space = 'personal' THEN count(*) ELSE 0 END as "25%",
    CASE WHEN statusstorie = false and statusFifty = true and category not in ('goals') and space = 'personal' THEN count(*) ELSE 0 END as "50%",
    CASE WHEN statusstorie = false and statusSeventyFive = true and category not in ('goals') and space = 'personal' THEN count(*) ELSE 0 END as "75%",
    CASE WHEN statusstorie = false and statusOneHundred = true and category not in ('goals') and space = 'personal' THEN count(*) ELSE 0 END as "100%"
from goals 

PSQL 示例：

select
    count(*) filter(where statusstorie = false and statusTwentyFive = true and category not in ('goals') and space = 'personal')  "25%",
    count(*) filter(where statusstorie = false and statusFifty = true and category not in ('goals') and space = 'personal') "50%",
    count(*) filter(where statusstorie = false and statusSeventyFive = true and category not in ('goals') and space = 'personal') "75%",
    count(*) filter(where statusstorie = false and statusOneHundred = true and category not in ('goals') and space = 'personal') "100%"
from goals 

注意：如果可能的话，我想将该函数复制到 MySQL

CREATE FUNCTION filter()

标签： mysqlpostgresqlfunctionfiltercase-when

Answer 1

这对你有用吗？

select
    sum(CASE WHEN statusstorie = false and statusTwentyFive = true and category not in ('goals') and space = 'personal' THEN 1 ELSE 0 END) as "25%",
    sum(CASE WHEN statusstorie = false and statusFifty = true and category not in ('goals') and space = 'personal' THEN 1 ELSE 0 END) as "50%",
    sum(CASE WHEN statusstorie = false and statusSeventyFive = true and category not in ('goals') and space = 'personal' THEN 1 ELSE 0 END) as "75%",
    sum(CASE WHEN statusstorie = false and statusOneHundred = true and category not in ('goals') and space = 'personal' THEN 1 ELSE 0 END) as "100%"
from goals