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Editorial Team
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Asked: 2026-05-31T06:15:50+00:00

I am dealing with phone system and have to work with multiple service vendors.

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I am dealing with phone system and have to work with multiple service vendors. For one vendor I have a MySQL table country_codes like this – 

---------------------------------------------------------
country_code  |  area_code  |  country
---------------------------------------------------------
93            |  93         |  Afghanistan
0             |  9375       |  Afghanistan Cellular-AT
0             |  9370       |  Afghanistan Cellular-AWCC
355           |  355        |  Albania
0             |  35568      |  Albania Cellular-AMC
0             |  35567      |  Albania Cellular-Eagle
213           |  213        |  Algeria
0             |  21377      |  Algeria Cellular-Djezzy
0             |  2135       |  Algeria Cellular-Wataniya
---------------------------------------------------------

and so on…

The country_code column wasn’t there before but I added it since I needed it for my PHP application. I managed to update the country codes for some records (using answer from my previous question here)

What I want to achieve is to replace the 0’s with the respective country code. So the table should look like this –

---------------------------------------------------------
country_code  |  area_code  |  country
---------------------------------------------------------
93            |  93         |  Afghanistan
93            |  9375       |  Afghanistan Cellular-AT
93            |  9370       |  Afghanistan Cellular-AWCC
355           |  355        |  Albania
355           |  35568      |  Albania Cellular-AMC
355           |  35567      |  Albania Cellular-Eagle
213           |  213        |  Algeria
213           |  21377      |  Algeria Cellular-Djezzy
213           |  2135       |  Algeria Cellular-Wataniya
---------------------------------------------------------

I hope I explained myself well enough. Any idea how can I do that with PHP-MySQL ?

(I don’t mind using PHP code to manipulate the table this way)

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1 Answer

  1. Editorial Team

    Try this query –

    UPDATE country_codes
SET country_code := @c := IF(@c IS NOT NULL AND country_code = 0, @c, country_code)
ORDER BY CAST(area_code AS CHAR)
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