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Editorial Team
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Asked: 2026-06-07T16:28:21+00:00

I need to select all products whose fields conform to a simple mathematical expression

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I need to select all products whose fields conform to a simple mathematical expression (in my case, division).

Example Query:

SELECT * FROM cars WHERE (retail_price/invoice_price)>1.05

Needs to be flexible:
I need flexibility here because I wish to be able to define the expression as a string somewhere else and just pop it in the SQL query after the WHERE clause.

$expression = "(retail_price/invoice_price)>1.05";
$query = "SELECT * FROM cars WHERE ".$expression." LIMIT 1";

Notes:
– Data type of retail_price is VARCHAR
– Data type of invoice_price is VARCHAR
– Not sure if VARCHAR is suitable for monetary values though..

Any suggestions? Because the above did not work for me. (Returned zero results)

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1 Answer

  1. Editorial Team

    It could be a rounding problem (as @Justin said).
    Try this:

    SELECT * FROM cars WHERE (1.0 * retail_price / invoice_price) > 1.05

    The idea is to force engine to manage floats (multiplying for float number 1.0).

    UPDATE:
    I see you’ve just edited data type to VARCHAR.
    Anyway the result (for me) is the same: look at http://sqlfiddle.com/#!2/298d3/2

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