[Koha] Problem with some SQL

[Carlos Lopez]

Hi everyone

I have the following reports that I would like to combine into one:

SELECT categories.description, COUNT(borrowers.borrowernumber)
FROM borrowers, categories
WHERE borrowers.categorycode = categories.categorycode
AND borrowers.date_renewed BETWEEN <<Expiry date BETWEEN (yyyy-mm-dd)|date>> AND <<and (yyyy-mm-dd)|date>>
GROUP BY borrowers.categorycode

(count the number of borrower renewals between 2 given dates and provide a breakdown by borrower category)

And

SELECT categories.description, COUNT(borrowers.borrowernumber)
FROM borrowers, categories
WHERE borrowers.categorycode = categories.categorycode
AND borrowers.dateenrolled BETWEEN <<Expiry date BETWEEN (yyyy-mm-dd)|date>> AND <<and (yyyy-mm-dd)|date>>
GROUP BY borrowers.categorycode

(same thing but for new enrolments rather than renewals)

What I would like is a report that will give me 3 columns: Borrower category (from categories.description), a count of newly-enrolled borrowers, and a count of renewed borrowers, with a breakdown by borrower category, but I only want the user to have to enter a single starting date and a single end date (not 2 identical date ranges).

I tried to run this one but it looks as though we're not allowed to set variables before the SELECT statement:

SET @start_date = <<Start of date range (yyyy-mm-dd)|date>>
SET @end_date = <<End of rate range (yyyy-mm-dd)|date>>
SELECT categories.description AS "BORROWER CATEGORY",
SUM(CASE WHEN borrowers.dateenrolled BETWEEN @start_date AND @end_date THEN 1 ELSE 0) NewBorrowers,
SUM(CASE WHEN borrowers.date_renewed BETWEEN @start_date AND @end_date THEN 1 ELSE 0) RenewedBorrowers
FROM borrowers, categories
WHERE borrowers.categorycode = categories.categorycode
GROUP BY borrowers.categorycode

Is something like what I'm trying to do even possible on Koha, or should I be happy with my 2 reports?

With kind regards from the Dalton McCaughey Library Team

Carlos Lopez

Dalton McCaughey Library | 29 College Crescent, Parkville, VICTORIA 3052
Ph: 03 9340 8888 ext.1 | library at dml.vic.edu.au<mailto:library at dml.vic.edu.au> | library.dmlibrary.org.au