Question 271675 in Mysql Question posted in
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Mysql – Multiple concat with like not showing the output in sql

I am using multiple concat with like but I am not getting all the output from the table. I am using below SQL query below in the database.

  select 
  company_id as ID, 
  concat(
    c.list_rank, '|||', c.company_name, 
    '|||', c.company_size, '|||', c.industry
  ) as post_content, 
  c.admin_approved from company22 c where company_name like ' % XYZ % ';

I am getting below output. Post content is showing null but I have all the data in the table

enter image description here

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2

Answers


  1. 0

    At least one of the values you’re concatenating must be NULL. Since any operation involving NULL returns NULL, that makes the final result NULL.

    Use IFNULL() to replace the null values with an empty string.

    CONCAT_WS('|||', IFNULL(c.list_rank, ''), IFNULL(c.company_name, ''), IFNULL(c.company_size, ''), IFNULL(c.industry, '')) AS post_content

    I also use CONCAT_WS() to simplify joining several values with the same delimiter.

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  2. 0

    you can also use CONCAT_WS

    like

     concat_ws('',
    c.list_rank, '|||', c.company_name, 
    '|||', c.company_size, '|||', c.industry
  ) as post_content

    The separator can be a string, as can the rest of the arguments. If the separator is NULL , the result is NULL ; all other NULL values are skipped. This makes CONCAT_WS() suitable when you want to concatenate some values and avoid losing all information if one of them is NULL.

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