How count notes from table?

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Hello! I need to show title categories from table Menu and count notes from table Cars, where menu.id = cars.marka. So, i wanna get the next: BMW (4), where 4 is number of notes from table Cars.
I tried such, but it not correct:

SQL

SELECT menu.title, COUNT( cars.id_cars ) AS total
FROM menu
LEFT JOIN cars ON (cars.marka = menu.id AND menu.parent_id =96
AND menu.block =3)

Posted 28-May-13 8:42am

Jardin1

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Maciej Los · Answer 1 · 2013-05-28T11:30:00

Jardin1 wrote:
i wanna get the next: BMW (4), where 4 is number of notes from table Cars.

In this case you need to use HAVING clause as follow:

SQL

DECLARE @pid INT
DECLARE @blo INT
DECLARE @cou INT

SET @pid = 96
SET @blo = 3
SET @cou = 4 --no. of BMW ;)

SELECT m.title
FROM menu AS m LEFT JOIN cars AS c ON c.marka = m.id 
WHERE m.parent_id =@pid AND m.block =@blo
GROUP BY m.title
HAVING COUNT(c.id_cars) = @cou

More:
HAVING (T-SQL)[^]
GROUP BY (T-SQL)[^]
Aggregate functions (T-SQL)[^]

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2013-05-28T09:06:00

Solution 2

Do like below...

SQL

SELECT 
      menu.title, 
      COUNT(cars.id_cars) AS total
FROM 
      menu
LEFT JOIN 
      cars 
ON (cars.marka = menu.id AND menu.parent_id = 96 AND menu.block = 3)
GROUP BY menu.title

Posted 28-May-13 9:06am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Houkes · Answer 3 · 2013-05-28T09:06:00

Solution 1

You need a GROUP BY menu.title statement for the COUNT to work,

Posted 28-May-13 9:06am

Houkes

Updated 28-May-13 9:07am

v3