SQL Reports in Koha

MySQL Reports in Koha in Koha
Nicole C. Engard Koha Documentation Manager
KohaCon 2009

MySQL Intro
MySQL is the language used to query data in the Koha database.
Koha’s database structure can be viewed here:
http://tinyurl.com/kohadbstructure
MySQL’s Documentation Library is a great source for help and information
http://dev.mysql.com/doc/index.html

Reading DB Structure
CREATE TABLE `branches` ( `branchcode` varchar(10) NOT NULL default '', `branchname` mediumtext NOT NULL, `branchaddress1` mediumtext, `branchaddress2` mediumtext, `branchaddress3` mediumtext, `branchphone` mediumtext, `branchfax` mediumtext, `branchemail` mediumtext, `issuing` tinyint(4) default NULL, `branchip` varchar(15) default NULL, `branchprinter` varchar(100) default NULL, UNIQUE KEY `branchcode` (`branchcode`) )

Reading DB Structure
This table’s name is ‘branches’ and it stores the information about libraries or branches in Koha.
Each field is easy to identify because of its name (ex. branchname is the library name).
A field with a number in parens after it is a field that is limited in size.
So varchar(10) means the field can have no more than 10 characters in it
Lastly, we see that ‘branchcode’ is the unique key or unique identifier in the table.

Reports in Koha
Koha has a very powerful guided reports wizard, but sometimes you want to write your own report - for that you need SQL
To start learning how to write SQL queries, you may want to create some guided reports and view the outputted SQL

Querying SQL
Once you know your database structure, querying SQL is very straightforward.
For Example:
SELECT branchcode,branchname FROM branches ORDER BY branchname ASC
This will list all of the branches and their codes in alphabetical order by branch name

Querying a Single Table Single Table
To query a single table you will structure your query like this:
SELECT column_names from table_name [WHERE ...conditions] [ORDER BY ...conditions];
Statements in brackets are optional
You can also select everything in a table by using an * in place of column_names

Querying Multiple Tables Tables
To query multiple tables you will have to join them on a key - what we saw as a UNIQUE KEY in the structure
SELECT a.column_names, b.column_names FROM a LEFT JOIN b ON (a.key=b.key);
OR
SELECT branches.branchname, items.barcode, COUNT(issues.issuedate) as totalissues FROM branches LEFT JOIN issues ON (issues.branchcode = branches.branchcode) LEFT JOIN items ON (issues.itemnumber = items.itemnumber) GROUP BY items.barcode;

Common Functions
COUNT(FIELD) or SUM(FIELD)
Counts the number of or adds up the total value of results in a column
CURDATE()
Is the current date (not time, just date)
MONTH(FIELD) and YEAR(FIELD)
Return the month and year from a field
DATE_SUB(DATE, INTERVAL)
Subtract a period of time from a date

Common WHERE clauses WHERE clauses
WHERE DATE BETWEEN ‘2009-04-01’ AND ‘2009-05-01’
Searches between dates (if no time present it assumes 00:00)
WHERE accounttype IN("A","F","FU")
The same as saying WHERE accounttype = “A” or accounttype = “F” ... etc
Can also do NOT IN( ) for !=

Date & Time Help
The most common use for reports is for end of the month or end of the year statistics
The MySQL manual on Date & Time functions is essential for these queries
http://dev.mysql.com/doc/refman/5.1/en/date-and-time- functions.html

Let’s Play
Think about the reports you would like to see in your Koha system and we’ll try to write at least one report for each of you.

Reports by Nicole
Patrons with fines:
SELECT borrowers.cardnumber,borrowers.surname,borrowers.firstname,FORMAT(SUM(accountlines.amountoutstanding),2) as due FROM borrowers LEFT JOIN accountlines on (borrowers.borrowernumber=accountlines.borrowernumber) WHERE accountlines.amountoutstanding > 0 GROUP BY borrowers.cardnumber ORDER BY borrowers.surname asc

Reports by Nicole
Long Overdues (12 days):
SELECT borrowers.cardnumber,borrowers.surname,borrowers.firstname,items.barcode,issues.date_due FROM borrowers LEFT JOIN issues on (issues.borrowernumber = borrowers.borrowernumber) LEFT JOIN items on (items.itemnumber = issues.itemnumber) WHERE issues.date_due < DATE_SUB(now(), INTERVAL 12 DAY) AND issues.returndate is NULL ORDER BY borrowers.surname asc

Reports by Nicole
Total number of items circulated from a branch other than the owning branch
SELECT count(*) as total from statistics LEFT JOIN items on (statistics.itemnumber = items.itemnumber) where statistics.branch != items.homebranch AND statistics.datetime between '2008-01-01' and '2008-12-31'

Reports by Nicole
How many new children's (shelving locations) books (Item types) did Library X add to the shared catalog in November 2008?
SELECT count(i.biblionumber) as added, i.itype, i.homebranch, i.location from items i WHERE YEAR(i.dateaccessioned) = 2008 AND MONTH(i.dateaccessioned) = 10 AND i.itype = 'BOOK' AND i.location = 'CHILDRENS' GROUP BY i.homebranch ORDER BY i.location asc

Other Reports
Number of titles cataloged (added) between and / or since x date(s):
SELECT COUNT(*) FROM biblio WHERE datecreated BETWEEN '2009-01-01' and '2009-02-01'
SELECT COUNT(*) FROM biblio WHERE datecreated > '2009-02-01'

More Help
NExpress ROCKS!
Reports: www.nexpresslibrary.org/training/reports-training/
Training Videos: www.nexpresslibrary.org/category/tutorial/
Several report videos

Thank You
Nicole C. Engard Koha Documentation Manager
KohaCon 2009
Slides Available Online on Koha Conference Wiki

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SQL Reports in Koha

by Nicole C. Engard on Apr 16, 2009

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