Basic SQL Error from AdvantureWorksLT2012

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Hi,

I'm messing around with databases to learn them and I have the following basic SQL which works fine:

SELECT Name AS ProductName, StandardCost AS Cost, ListPrice AS Price
FROM SalesLT.Product
WHERE
ListPrice / 2 < StandardCost;

However, when I alter the SQL as below:

SELECT Name AS ProductName, StandardCost AS Cost, ListPrice AS Price
FROM SalesLT.Product
WHERE
ListPrice / 4 < StandardCost;

It's returning all records in the table even though I'm now dividing by 4. Any ideas?

Cheers.

Brian.

Posted 24-Nov-13 1:03am

BrianHamilton

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OriginalGriff · Accepted Answer · 2013-11-24T01:26:00

Without your actual data, it's pretty difficult to be precise, but...
The operator precedence looks right - divide is done before <, so that should be right.
It may be that all ListPrice values are less than 4 times the standard cost: so try this:

SQL

SELECT Name AS ProductName, StandardCost AS Cost, ListPrice AS Price,
ListPrice / 2 AS LPBY2, ListPrice / 4 as LPBY4
FROM SalesLT.Product
WHERE
ListPrice / 4 < StandardCost;

And look at what the comparison is doing in each case.
If would probably also be worth reversing the test in each case and seeing what you get back:

SQL

...WHERE ListPrice / 2 >= StandardCost

SQL

...WHERE ListPrice / 4 >= StandardCost

That should help you work out why - but if not, let me know what results you do get.