SQL 查找某年某月的天数
declare @yearmonth varchar(6)
set @yearmonth='202002'
select day(dateadd(month,1,@yearmonth+'01')-1)
set @yearmonth='202002'select day(dateadd(month,1,@yearmonth+'01')-1)
set @yearmonth='202002'select day(dateadd(month,1,@yearmonth+'01')-1)
