[Koha] Problem with some SQL

[Carlos Lopez]

Thanks Sebastian but I'm afraid I'm still a little lost: How would you feed the same single expression (a user-supplied date range) to 2 separate fields?


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


________________________________
From: Koha <koha-bounces at lists.katipo.co.nz> on behalf of Sebastian Krieg <sebastian.krieg at tuz-eisenach.de>
Sent: Monday, 15 March 2021 6:40 PM
To: koha <koha at lists.katipo.co.nz>
Subject: Re: [Koha] Problem with some SQL

Hello,

Try this to combine the query and exp2 and exp3:

SELECT []
        FROM []
        WHERE
        exp1
        AND
        (exp2 OR exp3)
        ORDER by []
;

I hope this works, I got no error executing this query in my database...

Thanks

Sebastian


> Carlos Lopez <clopez at dml.vic.edu.au> hat am 15.03.2021 06:33 geschrieben:
>
>
> 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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>
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