Question

I need to take total count of files from category + sub category + subsub category

For that I write this kind of a query using my views.

select ((select count(*) from view_category where 1=1)+ (select count(*) from view sub category where 1=1) + (select count(*) from view subsub category where 1=1)) as cnt

Its returning count value. But I want to know any other better method is available to get the same result.

I tried this way but its not working (How to SUM() multiple subquery rows in MySQL?)

select sum(int_val) from((select count(*) from view_category where 1=1) as int_val union (select count(*) from view sub category where 1=1) as int_val union (select count(*) from view subsub category where 1=1) as int_val ).

Answer 1

This is working for me

select count(*) from(
(select count(*) from view_category where 1=1) union (select count(*) from view sub category where 1=1) union (select count(*) from view subsub category where 1=1) ) AS int_val;