Group_concat（）不根据数据排序

Question

Sorted data is what I want and I am not getting it from this order by clause addition to this statement.

SELECT
    GROUP_CONCAT(DISTINCT
        CONCAT(
            'COUNT((CASE WHEN (`ltd`.`total_pass_pc` =',total_pass_pc,') THEN 1 ELSE NULL END)) AS `TC=',total_pass_pc,'`'
        )
    )INTO @sql
    FROM log_tc_data
    ORDER BY `total_pass_pc`;

the results that this group_concat produce for total_pass_pc is in order 0 11.1111111 80 33.33333........not sorted I want to sort it 0 11.11111 33.333333 80......sorted order

here is the screen shot of its result

http://postimg.org/image/yywctdpj3/7cc79088/

Answer 1

You need a define a GROUP BY clause so that while selecting data the records will be grouped relative to this column name. And to sort it you can use ORDER BY inside GROUP_CONCAT Try this:

SELECT
GROUP_CONCAT(DISTINCT CONCAT('COUNT((CASE WHEN (`ltd`.`total_pass_pc`=',total_pass_pc,') THEN 1 ELSE NULL END)) AS `TC=',total_pass_pc,'`')
  ORDER BY `total_pass_pc`)INTO @sql

FROM log_tc_data;