sql server - SQL SUM() condtions questions -

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i have table looks this:

+----+------+--------+----------+ | id | code | optype | quantity | +----+------+--------+----------+ |  0 |    | in     |        7 | |  1 | b    | in     |        8 | |  2 |    | out    |        2 | |  3 | b    | in     |        7 | |  4 | b    | out    |       12 | +----+------+--------+----------+

i want sum(quantity) depending on optype. when optype out, quantity field should multiplied -1.

the result of query should be:

code   in   out   final      7    2     5 b      15   12    3

i've tried this, doesn't work:

select(select sum(quantity) table optype = 'in') as[in], (select sum(quantity) table optype = 'out') as[out], (select sum(quantity) table optype = 'in') - (select sum(quantity) table optype = 'out') as[final] table group code

sql server has pivot functionality.

select  [code], [in], [out], [in] - [out] [final]         (             select  [code], optype, sum(quantity) quantity                tablename             group   [code], optype         ) org         pivot         (             max(quantity)             optype in ([in],[out])         ) pvt

output

╔══════╦════╦═════╦═══════╗ ║ code ║ in ║ out ║ final ║ ╠══════╬════╬═════╬═══════╣ ║    ║  7 ║   2 ║     5 ║ ║ b    ║ 15 ║  12 ║     3 ║ ╚══════╩════╩═════╩═══════╝

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