Question

Can anyone help me with a MySQL query I’m trying to put together. I have two tables as follows (cut down just for the example).

uk_postcodes
____________
Pcode | County        | Region
AB10  | Aberdeen      | Scotland
AB11  | Aberdeen      | Scotland
B10   | West Midlands | West Midlands

p_venues
________
id | Venue_name     | address_postcode
1  | Samples venue  | AB10 1AT
2  | Samples venue  | B10 2DZ

Quite simply, I’m trying to select the Region from table uk_postcodes based on the corresponding postcode (address_postcode) in the p_venues table.

I’ve tried Like% and REGEXP ^ but can’t seem to get it to work.

This is what I’ve tried…

SELECT * FROM `uk_postcodes`, `p_venues` 
WHERE `p_venues`.address_postcode REGEXP ^ `uk_postcodes`.Pcode

This would be easy if I could specifically supply data hardcoded but the problem lies with the comparison (uk_postcodes.Pcode) in the 2nd part of the query being a field – I can’t seem to get the syntax right.

Can anyone please help??

Thanks

Answer 1

This ought to do it. You need to concatenate the LIKE wildcard to the Pcode value from uk_postcodes. If any of your columns are fixed length text, you may need to trim trailing spaces first.

SELECT  p.*, u.Region
FROM    p_venues p
        INNER JOIN
                uk_postcodes u
                ON p.address_postcode LIKE CONCAT(u.Pcode, '%')