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Editorial Team
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Asked: 2026-06-12T23:55:01+00:00

I have table1 and table2 in a Mysql database. Each table has a field

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I have table1 and table2 in a Mysql database.

Each table has a field with the same name, let’s say “id”.

I need a query where I can get the “id” field value of both tables. I tried this:

 SELECT 
   table1.id,
   table2.id
 FROM...

But I got an error message:

Unknown column ‘table1.id’ in ‘field list’

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1 Answer

  1. Editorial Team

    you need to add ALIAS on the columns 

     SELECT 
   table1.id AS table1_ID,                              -- keyword AS is optional
   table2.id AS table2_ID
 FROM...

    and call their alias (for example) $row["table1_ID"] in PHP .

    on more thing Unknown column 'table1.id' in 'field list' results from columns that are unable to be find by the server on your join statements.

    follow-up question, can you post the whole query?

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