sql - MySQL #1243 Unknown prepared statement handler (stmt) given to EXECUTE -


i following tutorial on installed version of mysql, it's throwing me error:

set @sql = null; select   group_concat(distinct     concat(       'max(if(property_name = ''',       property_name,       ''', value, null)) ',       property_name     )   ) @sql   properties; set @sql = concat('select item_id, ', @sql, ' properties group item_id');  prepare stmt @sql; execute stmt; deallocate prepare stmt;

i pasting on sql editor in phpmyadmin.

i followed suggestion. no errors shown here's result:

select item_id ,max(if(property_name = 'color', value, null)) color ,max(if(property_name = 'size', value, null)) size ,max(if(property_name = 'weight', value, null)) weight  properties group item_id

if have access mysql command-line, think you'll find sql code fine (as long @sql doesn't equal null) , issue phpmyadmin. idea wrap code in stored procedure , call procedure.


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