How do I 'subtract' sql tables?

Question

Its not really a subtraction I\'m looking for. And I know its not a union or intersection... I have been given a long and complex stored procedure that returns a table of

Answer 1

if you are substracting a percentage and updating a table use this

UPDATE `TABLENAME` SET `COLUMNNAME` = (50 / 100) * `COLUMNNAME`;

please note that the (50 / 100) is for 50% so in this case this query will discount 50% from the total value of the row!

Answer 2

You can also do this with the NOT IN clause

For example, assuming the stored procedures have given you table variables called @AllDocuments and @ActiveDocuments and each document has an identifier column called DocId

SELECT * FROM @AllDocuments 
WHERE DocId NOT IN 
    (SELECT DocId FROM @ActiveDocuments)

Adapt this as appropriate to match your table / column names.