How to create select dynamic fields from a table in mysql?

Question

I have query join in select statement like this :

select a.item_number, total_quantity, store, factory
from (
    select item_number, sum(quantity) as \"tot         


        

Answer 1

This is not tested ,create a fiddle if you find errors.

SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'ifnull(SUM(case when location_code = ''',
      location_code ,
      ''' then quantity end),0) AS `',
      location_code , '`'
    )
  ) INTO @sql
FROM
  item_details;
SET @sql = CONCAT('SELECT item_number,SUM(quantity) as "total_quantity", ', @sql, ' 
                  FROM item_details
                   GROUP BY item_number');

PREPARE stmt FROM @sql;
EXECUTE stmt;

DEALLOCATE PREPARE stmt;