求这个字段里的 百分比占比Sql怎么写,如满意的占总数的百分之多少,不满意的占百分之多少?
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with tt as (
select 1 as id,'满意' as grade union all
select 2 as id,'非常满意' as grade union all
select 3 as id,'满意' as grade union all
select 4 as id,'一般' as grade union all
select 5 as id,'很满意' as grade union all
select 6 as id,'不满意' as grade union all
select 7 as id,'满意' as grade union all
select 8 as id,'不满意' as grade union all
select 9 as id,'满意' as grade
)
select grade,COUNT(1) as 数量,convert(decimal(6,4),COUNT(1))/(select COUNT(*) from tt) as 百分比 from tt group by grade
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