Sum created columns at runtime mysql

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i want to sum up values of a row in a single column using MySQL. I have tried all the below codes but nothing seems to work, i need help please

What I have tried:

SELECT employee.dept,employee.loc, employee.work, 
COUNT(IF(employee_info.emp_date = '2021-11-01', employee_info.emp_date, NULL)) AS a,
 COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS b,
  COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS c, SUM("a"+"b"+"c") AS total FROM employee_info INNER JOIN employee ON employee_info.employee_number = employee.employee_number GROUP BY employee.dept WITH ROLLUP

SELECT employee.dept,employee.loc, employee.work, 
COUNT(IF(employee_info.emp_date = '2021-11-01', employee_info.emp_date, NULL)) AS a,
 COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS b,
  COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS c, SUM('a'+'b'+'c') AS total FROM employee_info INNER JOIN employee ON employee_info.employee_number = employee.employee_number GROUP BY employee.dept WITH ROLLUP

SELECT employee.dept,employee.loc, employee.work, 
COUNT(IF(employee_info.emp_date = '2021-11-01', employee_info.emp_date, NULL)) AS a,
 COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS b,
  COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS c, 'a'+'b'+'c' AS total FROM employee_info INNER JOIN employee ON employee_info.employee_number = employee.employee_number GROUP BY employee.dept WITH ROLLUP

Posted 15-Jan-22 11:03am

Member 13591430

Updated 16-Jan-22 2:52am

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2 solutions

Solution 1

Do it as a subquery:

SQL

SELECT Dept, Loc, Work, a, b, c, a + b + c  AS [Total]
FROM (SELECT employee.dept AS Dept, employee.loc AS Loc, employee.work AS Work, 
COUNT(IF(employee_info.emp_date = '2021-11-01', employee_info.emp_date, NULL)) AS a,
 COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS b,
  COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) AS c,  FROM employee_info INNER JOIN employee ON employee_info.employee_number = employee.employee_number GROUP BY employee.dept WITH ROLLUP)

Posted 15-Jan-22 11:23am

OriginalGriff

Comments

[no name] 16-Jan-22 9:00am

Thank you for your answer, but it seems to me the solution your provided is for SQL Server, while am using MYSQL. Well i tried it but it keeps giving me error 'ALL CREATED TABLES NEED TO HAVE AN ALIAS', i tried creating alias for the tables but no solution.
Thank you

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M Imran Ansari · Accepted Answer · 2022-01-16T02:52:00

You can also use your query like:

SELECT employee.dept,employee.loc, employee.work, 
(COUNT(IF(employee_info.emp_date = '2021-11-01', employee_info.emp_date, NULL)) +
COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL)) +
COUNT(IF(employee_info.emp_date = '2021-11-02', employee_info.emp_date, NULL))) AS total 

FROM employee_info 
	INNER JOIN employee ON employee_info.employee_number = employee.employee_number 
GROUP BY employee.dept WITH ROLLUP