Handle A Subtraction

How do i handle a subtraction between 2 entries in a table? they each belong to 2 tables. my code is below. I wish to subtract ordereditems_quantity from product_stock but i have no idea how to do it in asp.

sqlString="SELECT * FROM products, ordereditems "

sqlString = sqlString & "WHERE product_id=ordereditems_productID"

RS.OPEN sqlString

product_stock = RS( "product_stock" )

ordereditems_quantity = RS( "ordereditems_quantity" )

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Handle A Subtraction

How do i handle a subtraction between 2 entries in a table? they each belong to 2 tables. my code is below. I wish to subtract ordereditems_quantity from product_stock but i have no idea how to do it in asp. pls advise.

sqlString="SELECT * FROM products, ordereditems "
sqlString = sqlString & "WHERE product_id=ordereditems_productID"

RS.OPEN sqlString

product_stock = RS( "product_stock" )
ordereditems_quantity = RS( "ordereditems_quantity" )

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[Link...]

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