sql server - SUM aggregate function and Subquery -SQL -


i'm using ms sql server , have 2 tables.

supply_list

sl_id(pk) supply_id(fk)*       transaction_id    qty  1             14               872670099         3  2             15               872670100         5  3             16               872670101         1  4             16               872670105         4 <
  • supply_id foreign key supply_id in amenity table

supply

supply_id(pk)    no_of_units  ---------------------------- 13               2  14               3 15               6 16               10

the output should supply_id no. of units available equal no_of_units subtracted qty.

output

id      units available  ------------------------- 13           2  14           0 --> [1] 15           1 16           5 --> [2]

[1] since based on supply_list table supply_id 14 has 3 qty

[2] there 2 records contains supply_id 16 have add qty 4 , 1 have 5. , 5 subtracted no_of_units of supply_id 16 , 5 units available.

  • you left outer join list table parent table
  • subtract sum of list qty values parent no_of_units value
  • use isnull in case there no list rows

something like

select    s.supply_id,    s.no_of_units - isnull(sum(sl.qty), 0) [units available]    supply s    left join    supply_list sl on s.supply_id = sl.supply_id group    s.supply_id, s.no_of_units

this makes aggregate more obvious same query

select    s.supply_id,    s.no_of_units - isnull(sl.sumlistqty, 0) [units available]    supply s    left join    (    select supply_id, sum(qty) sumlistqty    supply_list    group supply_id    ) sl on s.supply_id = sl.supply_id

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