[Koha] Problem with some SQL

[Guillermo]

Hi Speak Spanish ?

Ing. Guillermo González

El lun., 15 de mar. de 2021 1:34 a. m., Carlos Lopez <clopez at dml.vic.edu.au>
escribió:

> 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
>
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