SQL tutorial-Field calculations

Field calculations

SQL  allows you to calculate the fields of a table. The basic arithmetic operations to calculate the fields are addition(+), subtraction(-), multiplication(*), and division(/).
Example: Calculate the sub totals of each product in the TblProduct below:

TblProduct table:

ProID ProName UnitPrice Qty CatID
P001Angkor 20$ 10 Cat001
P002Anchor 19$ 15 Cat002
P003ABC 50$ 8 Cat003

SELECT ProID,UnitPrice*Qty AS Subtotal

FROM TblProduct;


ProID Subtotal

Note: We use the AS keyword to assign the new name(Subtotal) to the new field that derive from the calculation of other fields. This is called aliasing the field name.



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