How do I get number of results (rows) in MySQL? - mysql

Question

Normally the query below gives me only one result (row).
SELECT
`s`.`FIRMA_UNVANI` AS `FIRMA_UNVANI`,
`s`.`RECNO` AS `RECNO`,
`s`.`BOLGE` AS `BOLGE`,
`s`.`BOLGE_NO` AS `BOLGE_NO`,
`s`.`DURUM` AS `DURUM`,
l.ILCE,
IL.SEHIR,
count(i.recno) AS NUMBER_OF_WORKS
FROM
`SERVISLER` `s`
LEFT JOIN KULLANICI k ON (s.BOLGE = k.KULLANICI)
LEFT JOIN kullanici_cihaz kc ON (k.RECNO = kc.KUL_RECNO)
LEFT JOIN servisler_ilceler c ON (s.RECNO = c.SER_RECNO)
INNER JOIN ILCE l ON (l.RECNO = c.ILCE_RECNO)
INNER JOIN IL ON (IL.ID = l.ILID)
LEFT JOIN ISEMRI i ON (
i.bolge = s.bolge_no
AND i.`SERVIS_DURUMU` = 1
)
WHERE
1 = 1
GROUP BY
s.BOLGE
ORDER BY
IS_SAYISI
LIMIT 0,
15
I get only one result
+----------------+-------+------+---------+------+-----+----------+-----------------+
|FIRMA_UNVANI |RECNO |BOLGE |BOLGE_NO |DURUM |ILCE | SEHIR | NUMBER_OF_WORKS |
+----------------+-------+------+---------+------+-----+----------+-----------------+
|Pirana |2501 |Tekkt |58 |-1 |NT |Istanbul |1428 |
+----------------+-------+------+---------+------+-----+----------+-----------------+
Here the key is RECNO.
I want to count the results:
SELECT
count(0) AS _count
FROM
`SERVISLER` `s`
LEFT JOIN KULLANICI k ON (s.BOLGE = k.KULLANICI)
LEFT JOIN kullanici_cihaz kc ON (k.RECNO = kc.KUL_RECNO)
LEFT JOIN servisler_ilceler c ON (s.RECNO = c.SER_RECNO)
INNER JOIN ILCE l ON (l.RECNO = c.ILCE_RECNO)
INNER JOIN IL ON (IL.ID = l.ILID)
LEFT JOIN ISEMRI i ON (
i.bolge = s.bolge_no
AND i.`SERVIS_DURUMU` = 1
)
WHERE
1 = 1
GROUP BY
s.BOLGE
And I get this wired result:
1428
It was supposed to be 1. Isn't it?

Answer 1

The result is perfectly fine, since you are just counting a 0 for every row instead of i.recno, therefore both resulting in 1428.
To count the number of results, you could wrap your whole query like this to get a resultcount:
SELECT count(*) AS resultcount FROM (
SELECT
`s`.`FIRMA_UNVANI` AS `FIRMA_UNVANI`,
`s`.`RECNO` AS `RECNO`,
`s`.`BOLGE` AS `BOLGE`,
`s`.`BOLGE_NO` AS `BOLGE_NO`,
`s`.`DURUM` AS `DURUM`,
l.ILCE,
IL.SEHIR,
count(i.recno) AS NUMBER_OF_WORKS
FROM
`SERVISLER` `s`
LEFT JOIN KULLANICI k ON (s.BOLGE = k.KULLANICI)
LEFT JOIN kullanici_cihaz kc ON (k.RECNO = kc.KUL_RECNO)
LEFT JOIN servisler_ilceler c ON (s.RECNO = c.SER_RECNO)
INNER JOIN ILCE l ON (l.RECNO = c.ILCE_RECNO)
INNER JOIN IL ON (IL.ID = l.ILID)
LEFT JOIN ISEMRI i ON (
i.bolge = s.bolge_no
AND i.`SERVIS_DURUMU` = 1
)
GROUP BY
s.BOLGE
ORDER BY
IS_SAYISI
LIMIT 0, 15) AS temp
Also note, that WHERE 1=1 is not necessary.

Answer 2

You have used GROUP BY in your query so you will get each group count in result, For example if there 3 group then you will get 3 count result..
If you need to get count of result rows then please use sub query see below
SELECT count(0) AS _count FROM(
SELECT
*
FROM
`SERVISLER` `s`
LEFT JOIN KULLANICI k ON (s.BOLGE = k.KULLANICI)
LEFT JOIN kullanici_cihaz kc ON (k.RECNO = kc.KUL_RECNO)
LEFT JOIN servisler_ilceler c ON (s.RECNO = c.SER_RECNO)
INNER JOIN ILCE l ON (l.RECNO = c.ILCE_RECNO)
INNER JOIN IL ON (IL.ID = l.ILID)
LEFT JOIN ISEMRI i ON (
i.bolge = s.bolge_no
AND i.`SERVIS_DURUMU` = 1
)
WHERE
1 = 1
GROUP BY
s.BOLGE
) AS Temp;