msyql 中的计数和排名，PHP

Question

Hi I need help with my query, i have a trackdb table that i need to get total count then rank them per user.

trackdb ----------`` ID task task2 task3 task4 task5 task6 User Date 1 Clean Repair Emp1 1/1/2019 2 Repair Emp2 1/2/2019 3 Clean Emp1 1/5/2019 4 Repair Emp3 1/6/2019 5 Clean Emp1 1/10/2019

I want to get the total task done for each User per month then Rank them

SELECT User,COUNT(CASE WHEN (task='Clean' OR task='Repair') THEN 1 END ) AS totaltask ,COUNT(CASE WHEN (task2='Clean' OR task3='Repair') THEN 1 END ) AS totaltask1 ,COUNT(CASE WHEN (task3='Clean' OR task3='Repair') THEN 1 END ) AS totaltask ,COUNT(CASE WHEN (task4='Clean' OR task4='Repair') THEN 1 END ) AS totaltask ,COUNT(CASE WHEN (task5='Clean' OR task5='Repair') THEN 1 END ) AS totaltask ,COUNT(CASE WHEN (task6='Clean' OR task6='Repair') THEN 1 END ) AS totaltask , FROM trackdb WHERE YEAR(date_received)='$period' AND User='$empname' AND MONTH(date_received)='$month'

$resultprod = mysqli_query($database,$queryprod);  
$rowprod = mysqli_fetch_array($resultprod);
$totprod = $rowprod['totaltask'] + $rowprod['totaltask1'] + $rowprod['totaltask2'] + $rowprod['totaltask3'] + $rowprod['totaltask4'] + $rowprod['totaltask5'];

I was able to get the total task of Emp1 per month per Year with the above query however i needed to get also the rank of Emp1 if compared with the other Employee.

Hope someone can help, Thanks in Advance!

Answer 1

I've the same problem a few months ago. Use dynamic pivot with group_concat like this.

SET @sql_dynamic = (
    SELECT
        GROUP_CONCAT( DISTINCT
            CONCAT(
                'SUM( IF(MONTH(trx_date) = '
                , MONTH(trx_date)
                , ', amount,0) ) AS mo_'
                , MONTH(trx_date)
            )
        )
    FROM sales_table
);

SET @sql = CONCAT('SELECT name, ', 
              @sql_dynamic, ' 
           FROM sales_table
           GROUP BY name WITH ROLLUP'
       );

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Result:

+---------+------+------+------+ | name | mo_1 | mo_2 | mo_3 | +---------+------+------+------+ | Alfa | 375 |815 |375 || Bravo | 310 |525 |825 || Charlie | 850 | 300 | 725 || Delta | 0 | 1000 | 370 || NULL | 1535 |2640 | 2295 | +---------+------+------+------+