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I have 3 tables (ativo, modelo, tipo) and I need get some columns of the tables (tipo and modelo).
Structure:
Ativo: id_ativo, name_ativo, fk_tipo_atv, fk_modelo_atv
Tipo: id_tipo, name_tipo
Modelo: id_modelo, name_modelo, fk_tipo_modelo
I need list "name - name_tipo - name_modelo"
Anyone can help me?
You haven't given us much to go on regarding what results you want, how the tables are linked and what you've tried but assuming that Ativo.fk_tipo_atv is a link to Tipo.id_tipo and Ativo.fk_modelo_atv is a link to Modelo.id_modelo:
SELECT a.name_ativo,t.name_tipo,m.name_modelo
FROM Ativo a
INNER JOIN Tipo t ON (a.fk_tipo_atv = t.id_tipo)
INNER JOIN Modelo m ON (a.fk_modelo_atv = m.id_modelo)
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I am working with Yii2 and I need to use the Query Builder to convert the following raw SQL query where I am using a subquery in the inner join.
SELECT *
FROM class
INNER JOIN
(SELECT name, MAX(score) AS Maxscore
FROM class
GROUP BY name) topscore
ON class.name = topscore.name
AND class.score = topscore.maxscore;
You should show a bit of effort on your behalf as it is how it works here on SO, but as you are a new bee so i am adding an answer.
It is pretty straight forward see the Query builder guide, and you need to use the subquery in the following way
$subQuery = new \yii\db\Query();
$subQuery->select([new \yii\db\Expression('[[name]], MAX([[score]]) as Maxscore')])
->from('class')
->groupBy('[[name]]');
$query = new \yii\db\Query();
$query->select('*')
->from('class')
->innerJoin(['topscore'=>$subQuery])
->where(['=','class.[[name]]',new \yii\db\Expression('topscore.[[name]]')])
->andWhere(['=','class.[[score]]',new \yii\db\Expression('topscore.[[maxscore]]')])
->all();
Note: I didn't tested it thou but it should work correctly.
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Using mysql 4/5
I have 2 tables:
ROUTE
route_order (int)
zipcode
LOADS
load_id
pu_zipcode
do_zipcode
Goal:
select all rows from Loads where
pu_zipcode and do_zipcode are in Route AND
where the route_order pu_zipcode < route_order do_zipcode
I think this is what you are asking:
SELECT L.*
FROM Loads AS L
JOIN Route AS R1
ON R1.zipcode = L.PU_zipcode
JOIN Route AS R2
ON R2.zipcode = L.do_zipcode
WHERE R1.ROUTE_ORDER < R2.ROUTE_ORDER
Try this query
SELECT l.load_id, l.pu_zipcode, l.do_zipcode
FROM LOADS AS l, ROUTE AS r1, ROUTE AS r2
WHERE l.pu_zipcode=r1.zipcode
AND l.do_zipcode=r2.zipcode
AND r1.route_order<r2.route_order
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I'm learning databases and I have a question: How can I list all the students that study in a specific school using joins?
My table is as follows:
X:schoolName(PK), SchoolAddress, SchoolTelephoneNumber
Y:schoolName(FK),StudentName,StudentNumber
How can i find out all the students name that study in 'London School' including there StudentNumber, SchoolAddress?
Try this:
SELECT
Students.StudentName,
Students.StudentNumber,
Schools.SchoolAddress
FROM
XSchools
INNER JOIN YStudents
ON Schools.schoolName = Students.schoolName
WHERE Schools.schoolName = 'London School'
SELECT
StudentName,
StudentNumber,
SchoolAddress
FROM
X
JOIN Y
WHERE Y.schoolName = 'London School'
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Using this query I get my data which I want.
select *
from tbl_project
join tbl_project_detail on tbl_project_detail.project_id = tbl_project.id
I need to know how I can use this SQL in Linq-to-SQL:
select SUM(pd.no_vacancy) as Number
from tbl_project p
join tbl_project_detail pd on pd.project_id = p.id
where p.id='1'
I also try it but it doesn't work.
var result = (from p in db.tbl_projects
join c in db.tbl_project_details on p.id equals c.project_id
where c.project_id == type
select new { c.no_vacancy }).Sum();
Please help me.. I am stuck :(
I think this might be help you:
from p in tbl_project
join pd in tbl_project_detail on project_id equals p.id
where p.id=1
select new
{
sum(pd => pd.no_vacancy)
};
At Last I Solve My Problem By Using This
var result = (from p in db.tbl_projects
join
c in db.tbl_project_details on p.id equals c.project_id
where c.project_id == type
select (int)c.no_vacancy ).Sum();
Thank You Everyone For Helping Me.. :)
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I have a database with products.
I need to add to name of products some string.
Example:
product name "abc1", "abc2", "abc3"
new products name: "Super abc1", "Super abc2", "Super abc3"
Use MySQL's concat().
If you want to update :
update tablename set column=concat('Super ', column);
You can even add a where clause .
update player
set productName= concat("super ",productName)
You need to use CONCAT function
SELECT CONCAT('Super ',columnWithABc) from tab