Msql Crosstab month rows as columns? - mysql

Question

Good morning, I am unsuccessfully trying to create a report using mysql/php, I would like to have rows as columns similar to Access Crosstab or Excel Pivot. I have sales staff & monthly sales which I would like to display across the page with month as column headers.
My query below outputs the data but every salesperson has a row for every month which doesnt read very well,
Jan | Feb | Mar | April
Sales1
Sales2
Sales3
Sales4
Select
tblcontacts.ContactFullName,
Count(tblcases.CaseID) As cases,
MonthName(tblcases.CaseDate) As Monthly
From
tblcases Inner Join
tblcontacts On tblcases.ContactAssignedTo =
tblcontacts.ContactID
Group By
tblcontacts.ContactFullName,
MonthName(tblcases.CaseDate)
with rollup
Ant advice or pointers appreciated, I have researched but most of it went right over my head!
Kind regards

Answer 1

What you can do is simply group by each contact and use conditional aggregation to count rows based on each month:
SELECT
a.ContactFullName,
SUM(MONTH(b.CaseDate) = 1) AS Jan,
SUM(MONTH(b.CaseDate) = 2) AS Feb,
SUM(MONTH(b.CaseDate) = 3) AS Mar,
SUM(MONTH(b.CaseDate) = 4) AS Apr,
SUM(MONTH(b.CaseDate) = 5) AS May,
SUM(MONTH(b.CaseDate) = 6) AS Jun,
SUM(MONTH(b.CaseDate) = 7) AS Jul,
SUM(MONTH(b.CaseDate) = 8) AS Aug,
SUM(MONTH(b.CaseDate) = 9) AS Sep,
SUM(MONTH(b.CaseDate) = 10) AS Oct,
SUM(MONTH(b.CaseDate) = 11) AS Nov,
SUM(MONTH(b.CaseDate) = 12) AS Dec
FROM
tblcontacts a
INNER JOIN
tblcases b ON a.ContactID = b.ContactAssignedTo
GROUP BY
a.ContactFullName
Edit: As per your comments to this answer: to get a price sum of each month, you can do something like:
SELECT
a.ContactFullName,
SUM(IF(MONTH(b.CaseDate) = 1, b.price, 0)) AS Jan,
SUM(IF(MONTH(b.CaseDate) = 2, b.price, 0)) AS Feb,
SUM(IF(MONTH(b.CaseDate) = 3, b.price, 0)) AS Mar,
SUM(IF(MONTH(b.CaseDate) = 4, b.price, 0)) AS Apr,
SUM(IF(MONTH(b.CaseDate) = 5, b.price, 0)) AS May,
SUM(IF(MONTH(b.CaseDate) = 6, b.price, 0)) AS Jun,
SUM(IF(MONTH(b.CaseDate) = 7, b.price, 0)) AS Jul,
SUM(IF(MONTH(b.CaseDate) = 8, b.price, 0)) AS Aug,
SUM(IF(MONTH(b.CaseDate) = 9, b.price, 0)) AS Sep,
SUM(IF(MONTH(b.CaseDate) = 10, b.price, 0)) AS Oct,
SUM(IF(MONTH(b.CaseDate) = 11, b.price, 0)) AS Nov,
SUM(IF(MONTH(b.CaseDate) = 12, b.price, 0)) AS Dec
FROM
tblcontacts a
INNER JOIN
tblcases b ON a.ContactID = b.ContactAssignedTo
GROUP BY
a.ContactFullName
Basically, for each row, if the casedate is in a particular month, pass the value of the price column to the SUM aggregation, otherwise, just pass it 0.

Answer 2

Select
tblcontacts.ContactFullName,
sum(case when MonthName(tblcases.CaseDate)='January' then 1 else 0 end) as January,
sum(case when MonthName(tblcases.CaseDate)='February' then 1 else 0 end) as February,
.
.
sum(case when MonthName(tblcases.CaseDate)='December' then 1 else 0 end) as December,
From
tblcases Inner Join
tblcontacts On tblcases.ContactAssignedTo =
tblcontacts.ContactID
Group By
tblcontacts.ContactFullName