how to calculate difference of two columns

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I had two tables as
table1 'sale' has column 'saleamount'
table2 'purchase' has column 'purchaseamount'

as

SQL

sale                         purchase
saleamount                   purchaseamount
40                           10
50                           20
60                           15

from above table,

SQL

40-10==30
50-20==30
60-15==45

i want to calculate total of the above difference(30+30+45=105)

Posted 15-May-15 21:25pm

Amol Koruche

Updated 15-May-15 21:51pm

King Fisher

v2

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OriginalGriff · Answer 1 · 2015-05-15T21:46:00

You probably need to have a linking element between the two tables, that identifies the item you are buying and selling - otherwise you will need two tables for each item in your store, which is silly!

Buy - it's pretty trivial to get SQL to return the value from your tables:

SQL

SELECT (SELECT SUM(saleAmount) FROM sale) - (SELECT SUM(purchaseAmount) FROM purchase)

It's just that it is useless in the real world!