sql - What is best way to merge 2 select statement? -

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i have sql server query statement this:

with (     select (             sum(case                      when (t1.price) > 0                         (t1.price)                     else 0                     end)             ) pr1         ,(             abs(sum(case                          when (t1.price) < 0                             (t1.price)                         else 0                         end))             ) pr2     dbo.price_table t1     )     ,b (     select (when(pr1 - pr2) < 0 abs(pr1 - pr2) else 0 end) res         ) select res b

in query, use 2 select statement achieve "res" column, want achieve "res" column in 1 select statement.

what best way merge 2 select statement 1 select statement query?

your calculation seems way complicated. taking sum of positive values. sum of negative values, using abs() make value positive, , subtracting result. guess what? same taking sum() of values in first place.

so, think statement equivalent:

select (case when sum(t1.price) < 0              abs(sum(t1.price))              else 0         end) dbo.price_table t1;

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