SQL查询似乎不会影响相同的行数，添加一个count语句

Question

I have made a query that looks like this

Query 1.

  SELECT zlec_status.nazwa                       AS Status, 
           piorytet.nazwa                          AS Priorytet, 
           Concat(koord.imie, ' ', koord.nazwisko) AS `Koordynator`, 
           Concat(zlec_adresy.miasto, ' - ', zlec_adresy.ulica, ' ', 
           zlec_adresy.oddzial) 
                                                   AS `adres`, 
           zlec_z_dnia,zlec_id, 
           zlec_nr, 
           zlec_do, 
           zlec_ogran, 
           awizacje, 
           awizacja_na_dzien, 
           termin_zamkniecia, 
           tresc, 
           uwagi 
    FROM   zlec 
           INNER JOIN koord 
                   ON zlec.koord = koord.id 
           INNER JOIN zlec_adresy 
                   ON zlec.zlec_addres = zlec_adresy.id 
           INNER JOIN piorytet 
                   ON zlec.priorytet = piorytet.id 
           INNER JOIN zlec_status 
                   ON zlec.status_zlecenia = zlec_status.id 

And the following one which is a ordinary one

Query 2.

SELECT * FROM zlec;

The thing is the first one returns ( affects by executing ) 48 rows where the second query returns 103 rows. What could be the possible cause of this?

I will also show you my dumb of the sql in case you would like to make a run on your own http://pastebin.com/cMPAtxCU .

Subquestion - quite no point starting of with a new question for that because its also connected with the row count affect.

Besides I was wondering how can I get into the first query a count(*) to get the affected rows - it has to be done in sql I cannot use php code for that, probably it would be good to use a limit 1 for the count.

Answer 1

With INNER JOIN , if one of your other tables, koord , zlec_adresy , piorytet and zlec_status is missing a record corresponding to a record in zlec , that record in zlec will not be in the result set. If you want every record in zlec to appear, you have to use LEFT JOIN . Check out:

http://blog.codinghorror.com/a-visual-explanation-of-sql-joins/

For a pretty good explanation.

Answer 2

With your additional inner joins rows might be eliminated. Have you tried adding the inner joins to your "Select * FROM zlec;"?