Select the cast (((select COUNT (*) from the table name
Where OperTime between '2020-01-18 08:00:00. 000' and 'the 2020-01-19 08:00:00. 000' and TotalLevel=1)/
(select COUNT (TotalLevel) from the name of the table where OperTime between '2020-01-18 08:00:00. 000' and 'the 2020-01-19 08:00:00. 000'))
* 100 as nvarchar (50)) + cast (' % 'as nvarchar (2))
Why the result is 0, for help bosses