Question

I need to combine 2 columns and find whether the combined content matches something. However the following query doesn’t work:

select 
  concat(column1,column2) as combined_column 
from 
  my_table 
where 
  combined_column like '%value%';

MySQL reports an error that ‘combined_column’ doesn’t exist. How to solve this problem?

Answer 1

You should replace your where clausole with this one:

where concat(column1,column2) like '%value%';

Explanation: The where clausole isn’t able to read the var named in the SELECT.