sql - MYSQL query for selecting the result of a condition of one table and showing it on another table -


the 2nd row should subtracted 1st row...and display result in 2nd table

1st table

-------------------------------- stock_name|temple|quantity|type -------------------------------- rice      |shiva |  32    |purchase rice      |shiva |  10    |issue

initially 2nd table empty

what need in 2nd table follows

--------------------------- stock_name|temple|quantity -------------------------- rice      |siva  |22 

insert table2(stock_name,temple,quantity) select a.stock_name, a.temple, sum(case when type='purchase' quantity else (quantity*-1) end) quantity table1 group a.stock_name, a.temple

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