Where have I made a Failure is SQL statement?

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So, I want to get datas from database by filtering 4 columns. First column title is Money(amount of money) and the second is Currency, but I have in DB additionally two same Columns with same definitions for example: Money2 and Currency2. So I want to get all datas form db where Money is more than 100 and Currency is USD, but additionally I want to get all datas where Money2 is more than 200 and Currency2 is EUR. I have following query written but unfortunately it doesn't give result from second query.

SQL

SELECT * FROM DB WHERE (Money > 100 AND Currency =  USD) OR Money2 > 200 AND Currency2 = EUR).

Where have i made a failure ?

Posted 20-Jan-16 13:08pm

dave_bulac

Updated 20-Jan-16 13:23pm

Garth J Lancaster

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PIEBALDconsult 20-Jan-16 20:14pm

Be _very_ careful when mixing AND with OR -- I recommend you add more parentheses to specify _exactly_ what you intend.

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Mathi Mani · Answer 1 · 2016-01-20T14:32:00

From your query(given below for reference), I can see two misses:

SELECT * FROM DB WHERE (Money > 100 AND Currency =  USD) OR Money2 > 200 AND Currency2 = EUR).

First, the statement may be missing a open bracket "(" before Money2, so you can try adding that to the select query, like:

SELECT * FROM DB WHERE (Money > 100 AND Currency =  USD) OR (Money2 > 200 AND Currency2 = EUR)

Second, from the data, I assume Currency and Currency2 are varchar or char fields. You might want to try by adding single quotes for these inputs, like:

SELECT * FROM DB WHERE (Money > 100 AND Currency =  'USD') OR (Money2 > 200 AND Currency2 = 'EUR').

Garth J Lancaster · Answer 2 · 2016-01-20T13:28:00

You dont give us any examples of the data in your DB, or say what the 'failure' actually is

I'd hazard one guess/hint, the 'OR Money2...' clause should be 'AND Money2.....' - you say

Quote:
additionally I want to

which means you want both sets of data returned, not one or the other as you have now ..

without seeing your data I'd also be thinking wether a 'union' is what you need, what if you have data that satisfies both contraints in the same record - Ideally you would want 2 lines of data out ? yes/no/maybe ?

dave_bulac · Answer 3 · 2016-01-20T23:06:00

Solution 3

Solution for this question is to use UNION like this : SELECT * FROM DB WHERE Money > 100 AND Currency = 'USD' UNION Money2 > 200 AND Currency = 'EUR'

Posted 20-Jan-16 23:06pm

dave_bulac

Where have I made a Failure is SQL statement?

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