Select non-empty field

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1

demo table

 id  imagem       flash       codigo
 1   fda.jpg
 2             asdfasd.sfw
 3                           adsense

is there any way to SELECT only the non-empty? if yes what is the best way in PHP or SQL?

          $sql = "SELECT * FROM publicidade ORDER BY RAND() LIMIT 6";

         if flash,image = "" echo codgio

         if codigo,image = "" echo flash

is around or has some way more proper?

php sql
  • 1

    Empty values are empty strings or NULL?

  • Are Empty Strings

1 answer

3


You can use the expression CASE in select, for example:

SELECT
  CASE
    WHEN imagem != '' THEN imagem
    WHEN flash != '' THEN flash
    WHEN codigo != '' THEN codigo
    ELSE NULL
  END AS val
FROM publicidade
ORDER BY RAND()
LIMIT 6

And in php, with the result of this query you can use:

echo $row['val'];

  • really worked but now that I saw it here has to be via php even because the call codes are different for each type I’ll see if the case of php works the same way

  • 1

    Try to use a better template in the database. The correct one would be to have a column of the value type, not a column for each type. For example, tipo_publicidade => "imagem", valor_publicidade => "fda.jpg". That way you would only need to check the type of the value, nor would you need this query that I wrote as an answer. If you want I’ll explain it to you somewhere else.

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