I have the following tables
player
-------------
idPlayer,
name,
age,
position
Team
--------
idTeam,
name,
value
and the intermediate table:
team_has_player
-----------
idPlayer,
idTeam
What I need is to search in "team_has_player" with the variable "idTeam" and select all the players that are the ordered pair, summarizing, search for "idTeam" and show all the "Player" that have their "idPlayer" related to that "idTeam".
Use this SELECT Statement
SELECT
e.nombre,
j.nombre
, j.edad
, j,posicion
FROM `jugador/equipo` je
INNER JOIN Equipo e ON e.idEquipo = je.idEquipo
INNER JOIN jugador j ON j.idJugador = je.idJugador
WHERE je.idEquipo = 1;
It will show you, the name of the Club and the nam,e of the Players plus there Age and Position
If you only want to know the ids from the player related to a team, this could work:
SELECT idPlayer FROM team_has_player WHERE idTeam = 2;
This will return a list with all the players in that team.
If you want to know more information like the names (or other info in the player table) you could do the following:
SELECT p.name, p.position FROM player p
JOIN team_has_player tp
ON tp.idplayer = p.idplayer
WHERE tp.team_idteam = 2;
It is not quite clear, what format you expect as output but you could try the following:
SELECT e.nombre nombre_equipo,
GROUP_CONCAT(j.nombre) jugadores
FROM equipo e
INNER JOIN jugador_equipo je ON je.equipo=e.equipo
INNER JOIN jugador j ON j.idjugador=je.idjugador
GROUP BY e.nombre
Related
I have four tables, three of which are pretty static: haul_types, dumpster_type_team (the dumpster_type_team has the many-to-many relationship between dumpster_types and teams), and users. The fourth table, hauls, has transactional data.
haul_types:
id
name
dumpster_type_team:
id
dumpster_type_id
team_id
users:
id
first_name
last_name
is_driver
team_id
hauls:
haul_type_id
haul_status_id
set_dumpster_type_id
completed_driver_id
team_id
I would like a query that has a combination of dumpster_types, haul_types, and drivers (users) and a count of the hauls they were involved in. In some cases, there should be a count of zero because some drivers haven't completed hauls for every haul_type / dumpster type combination.
Here's the query I have so far that seems to be behaving as if it is an inner join because the records are getting filtered to only show where there are matches:
SELECT
c.haul_type_id,
c.dumpster_type_id,
c.driver_id,
count(h.id) AS haul_count
FROM
hauls h
RIGHT JOIN ( SELECT DISTINCT
ht.id AS haul_type_id,
dtt.dumpster_type_id AS dumpster_type_id,
dtt.team_id AS team_id,
u.id AS driver_id
FROM
haul_types ht
CROSS JOIN dumpster_type_team dtt
CROSS JOIN users u
WHERE
u.team_id = dtt.team_id
AND u.is_driver = TRUE) c ON c.haul_type_id = h.haul_type_id
AND c.dumpster_type_id = h.set_dumpster_type_id
AND c.driver_id = h.completed_driver_id
AND c.team_id = h.team_id
WHERE
h.team_id = 9
AND h.haul_status_id = 3
AND h.completed_driver_id IS NOT NULL
GROUP BY
c.haul_type_id, c.dumpster_type_id, c.driver_id
When I run the subquery in isolation:
SELECT DISTINCT
ht.id AS haul_type_id,
dtt.dumpster_type_id AS dumpster_type_id,
dtt.team_id AS team_id,
u.id AS driver_id
FROM
haul_types ht
CROSS JOIN dumpster_type_team dtt
CROSS JOIN users u
WHERE
u.team_id = dtt.team_id
AND u.is_driver = TRUE
I get the results I want: a row for each permutation of haul_type, dumpster_type, driver_id, and team_id. However, when I run the entire query, I get filtered results despite the right join.
What I would like to have is the following:
If I have 4 haul_types: delivery, swap, live, pickup
and 2 dumpster_types: 10YD, 15YD
and 2 drivers: 1, 2
I would like a haul count for the combination of haul_type, dumpster_type, and driver. If there are no hauls matching the row, show 0:
Any help is appreciated. Thank you
The description of the question and the query seem to have little to do with each other. I don't know what a "pivot table" is supposed to be.
I would like a query that has a combination of dumpster_types, haul_types, and drivers (users) and a count of the hauls they were involved in.
This sounds like a cross join to generate the rows and then a left join/group by to calculate the results:
select d.dumpster_id, ht.haul_type_id, d.driver_id, count(h.driver_id)
from dumpster_types d cross join
haul_types ht cross join
drivers d left join
hauls h
on h.dumpster_id = d.dumpster_id and
h.haul_type_id = ht.haul_type_id and
h.driver_id = d.driver_id
group by d.dumpster_id, ht.haul_type_id, d.driver_id;
Running the query #GordonLinoff provided, exposed the issue I was facing - when applying a where clause on the top level query, the results were getting filtered to only matches. I moved the where clause to individual subqueries and now I am getting all expected results.
Not sure if this is the most efficient way to write it but it yields the correct results:
SELECT
d.dumpster_type_id,
ht.id AS haul_type_id,
u.id AS driver_id,
count(h.id) AS haul_count
FROM (
SELECT
dumpster_type_id,
team_id
FROM
dumpster_type_team
WHERE
team_id = 9) d
CROSS JOIN haul_types ht
CROSS JOIN (
SELECT
users.id
FROM
users
WHERE
users.is_driver = TRUE
AND users.team_id = 9) u
LEFT JOIN (
SELECT
id, set_dumpster_type_id, haul_type_id, completed_driver_id, team_id
FROM
hauls
WHERE
haul_status_id = 3
AND team_id = 9) h ON h.set_dumpster_type_id = d.dumpster_type_id
AND h.haul_type_id = ht.id
AND h.completed_driver_id = u.id
AND h.team_id = d.team_id
GROUP BY
d.dumpster_type_id,
ht.id,
u.id
I am using the following query to retrieve the number of events per state from 2 tables that are linked by a userID.
SELECT state,COUNT(*) AS num
FROM tableUserInfo
WHERE userID IN (SELECT userID
FROM tableEvents
WHERE conditionOne = 1
AND conditionTwo = 2)
GROUP BY state
This query works correctly. My problem is that not all states have user entries, and I need the query to return 0 for those. I was wondering if there was a method such as joining or using an in clause, that would included a set of all states, making the query return 0 for any that didn't have entries in tableEvents?
Do you have a list of states? If not then this would give a list of all the states your database knows about:
SELECT DISTINCT state FROM tableUserInfo
....and enclosing this in brackets it can be dropped in place in the query below:
SELECT s.state, IFNULL(cnt, 0) AS num
FROM list_of_states s
LEFT JOIN (
SELECT state,COUNT(*) AS cnt
FROM tableUserInfo ui
INNER JOIN tableEvents te
ON ui.userId=te.userId
WHERE conditionOne = 1
AND conditionTwo = 2
GROUP BY state
) u
ON s.state=u.state;
Although in the absence of "list_of_states" it would be more efficient to do this:
SELECT ui.state, SUM(IF(te.userId IS NULL, 0, 1)) AS cnt
FROM tableUserInfo ui
LEFT JOIN tableEvents te
ON ui.userId=te.userId
AND te.conditionOne = 1
AND te.conditionTwo = 2
GROUP BY state;
As #raymond-nijland suggested you can use Left Join to include all states.
SELECT tableUserInfo.state,COUNT(tableUserInfo.*) AS num
FROM tableUserInfo Left Join tableEvents on tableUserInfo.userID = tableEvents.userID
WHERE tableEvents.conditionOne = 1 AND tableEvents.conditionTwo = 2
GROUP BY state
I have a problem with this query in MariaDB language. I want to do an intersect with the same field but with two values. The problem is that i can't use the INTERSECT query.
How can I do it?? I have tried with exists and inner join but it still doesn't work.
SELECT nombre
FROM actores
WHERE codactor IN ( SELECT actor
FROM participacion
WHERE (titulo,año) IN (SELECT titulo, año
FROM peliculas
WHERE director IN (
SELECT coddirector
FROM directores d
WHERE d.nombre='Alejandro'
AND d.apellido='Amenabar')))
INTERSECT
SELECT nombre
FROM actores
WHERE codactor IN ( SELECT actor
FROM participacion
WHERE (titulo,año) IN (SELECT titulo,año
FROM peliculas
WHERE director in (
SELECT coddirector
from directores p
WHERE p.nombre='Pedro'
AND p.apellido='Almodobar')));
INTERSECT was introduced in MariaDB 10.3.0.
INTERSECT
The result of an intersect is the intersection of right and left SELECT results, i.e. only records that are present in both result sets will be included in the result of the operation.
(SELECT e_name AS name, email FROM employees)
INTERSECT
(SELECT c_name AS name, email FROM customers);
As for your query you could leave it as is.
First try it like this, to check you have all the actors. I have to add codactor in case you have actors with same name.
SELECT a.codactor, a.nombre -- add ', *' to see all columns and test query is ok.
FROM actores a
JOIN participacion p
ON a.codactor = p.actor
JOIN peliculas m
ON p.titulo = m.titulo
AND p.ano = m.ano
JOIN directores d
ON p.director = d.coddirector
WHERE (d.nombre = 'Alejandro' and d.apellido = 'Amenabar')
OR (d.nombre = 'Pedro' and d.apellido = 'Almodobar')
Then add GROUP BY to see which actor are in movies from both directors.
GROUP BY a.codactor, a.nombre
HAVING COUNT(DISTINCT coddirector) = 2
I have this query, where I am trying to get max age of a retail store seller(There's multiple towns), and show multiple if there's multiple people with the same (max)age. I am using Microsoft Access 2010. Here is the query:
SELECT Linnad.Linn, Myyjad.Nimi, Max(Myyjad.Vanus) As Vanus
FROM Linnad INNER JOIN Myyjad ON Linnad.LinnID = Myyjad.LinnID
GROUP BY Linnad.Linn, Myyjad.Nimi
ORDER BY Linnad.Linn;
The problem is, it seems to ignore the MAX, and just shows all of the values, and I can't remove the group by Myyjad.Nimi, because it gives me an error that aggregate function not included for Myyjad.Nimi.
And the output should be:
Town - Name - Max(Age)
Also, Linn = Town, Nimi = Name and the Vanus = Age.
I think this may be what your looking for:
SELECT L.Linn, M.Nimi, M.Vanus
FROM Linnad As L,
(
SELECT M2.LinnID, M2.Nimi, M2.Vanus
FROM Myyjad As M2
WHERE M2.Vanus = (SELECT Max(Z.Vanus) FROM Myyjad As Z WHERE Z.LinnID = M2.LinnID)
) As M
WHERE M.LinnID = L.LinnID
This performs a sub-select to get a list of the Linn ID's with all Nimi's showing the maximum Vanus, then we link this sub-select back to the Linnad table via the LinnID.
I think you want:
SELECT Linnad.Linn, Myyjad.Nimi, Myyjad.Vanus
FROM Linnad INNER JOIN Myyjad ON Linnad.LinnID = Myyjad.LinnID
WHERE DateValue(Myyjad.Vanus)
= (SELECT Max(DateValue(Myyjad.Vanus)) FROM Myyjad)
ORDER BY Linnad.Linn
Top N per group:
SELECT Linnad.Linn, Myyjad.Nimi, Myyjad.Vanus
FROM FROM Linnad INNER JOIN Myyjad ON Linnad.LinnID = Myyjad.LinnID
WHERE Myyjad.ID In (
SELECT Top 1 m.ID
FROM Myyjad m
WHERE m.LinnID=Linnad.ID
ORDER BY m.Vanus Desc, m.ID)
Grouping by Linn (town) and Nimi (name) tells the db engine to give you one row for each combination of town and name, and show you the maximum Vanus (age) for each of those combinations. And logically, that's not what you want. You want the name of each person whose age is the same as the maximum age in that town.
First verify you can retrieve the max age for each LinnID.
SELECT
LinnID,
Max(Vanus) As MaxOfVanus
FROM
Myyjad
GROUP BY LinnID;
If that works, you can save it as "qryTownAge", then use it in another query where you join it (on LinnID) with Linnad. That will allow you to retrieve the matching Linn.
SELECT l.LinnID, l.Linn, q.MaxOfVanus
FROM
Linnad AS l
INNER JOIN qryTownAge AS q
ON l.LinnID = q.LinnID
ORDER BY l.Linn;
If that works, save it as qryTownAge2. Then try this query.
SELECT q.Linn, q.MaxOfVanus, m.Nimi
FROM
qryTownAge2 AS q
INNER JOIN Myyjad AS m
ON (
m.LinnID = q.LinnID
AND m.Vanus = q.MaxOfVanus
)
ORDER BY q.Linn;
If that all works, you could create a single query which does it all. However, doing it step by step should help us pinpoint errors.
I have 3 tables
person (id, name)
area (id, number)
history (id, person_id, area_id, type, datetime)
In this tables I store the info which person had which area at a specific time. It is like a salesman travels in an area for a while and then he gets another area. He can also have multiple areas at a time.
history type = 'I' for CheckIn or 'O' for Checkout.
Example:
id person_id area_id type datetime
1 2 5 'O' '2011-12-01'
2 2 5 'I' '2011-12-31'
A person started traveling in area 5 at 2011-12-01 and gave it back on 2011-12-31.
Now I want to have a list of all the areas all persons have right now.
person1.name, area1.number, area2.number, area6.name
person2.name, area5.number, area9.number
....
The output could be like this too (it doesn't matter):
person1.name, area1.number
person1.name, area2.number
person1.name, area6.number
person2.name, area5.number
....
How can I do that?
This question is, indeed, quite tricky. You need a list of the entries in history where, for a given user and area, there is an 'O' record with no subsequent 'I' record. Working with just the history table, that translates to:
SELECT ho.person_id, ho.area_id, ho.type, MAX(ho.datetime)
FROM History AS ho
WHERE ho.type = 'O'
AND NOT EXISTS(SELECT *
FROM History AS hi
WHERE hi.person_id = ho.person_id
AND hi.area_id = ho.area_id
AND hi.type = 'I'
AND hi.datetime > ho.datetime
)
GROUP BY ho.person_id, ho.area_id, ho.type;
Then, since you're really only after the person's name and the area's number (though why the area number can't be the same as its ID I am not sure), you need to adapt slightly, joining with the extra two tables:
SELECT p.name, a.number
FROM History AS ho
JOIN Person AS p ON ho.person_id = p.id
JOIN Area AS a ON ho.area_id = a.id
WHERE ho.type = 'O'
AND NOT EXISTS(SELECT *
FROM History AS hi
WHERE hi.person_id = ho.person_id
AND hi.area_id = ho.area_id
AND hi.type = 'I'
AND hi.datetime > ho.datetime
);
The NOT EXISTS clause is a correlated sub-query; that tends to be inefficient. You might be able to recast it as a LEFT OUTER JOIN with appropriate join and filter conditions:
SELECT p.name, a.number
FROM History AS ho
JOIN Person AS p ON ho.person_id = p.id
JOIN Area AS a ON ho.area_id = a.id
LEFT OUTER JOIN History AS hi
ON hi.person_id = ho.person_id
AND hi.area_id = ho.area_id
AND hi.type = 'I'
AND hi.datetime > ho.datetime
WHERE ho.type = 'O'
AND hi.person_id IS NULL;
All SQL unverified.
You're looking for results where each row may have a different number of columns? I think you may want to look into GROUP_CONCAT()
SELECT p.`id`, GROUP_CONCAT(a.`number`, ',') AS `areas` FROM `person` a LEFT JOIN `history` h ON h.`person_id` = p.`id` LEFT JOIN `area` a ON a.`id` = h.`area_id`
I haven't tested this query, but I have used group concat in similar ways before. Naturally, you will want to tailor this to fit your needs. Of course, group concat will return a string so it will require post processing to use the data.
EDIT I thikn your question has been edited since I began responding. My query does not really fit your request anymore...
Try this:
select *
from person p
inner join history h on h.person_id = p.id
left outer join history h2 on h2.person_id = p.id and h2.area_id = h.area_id and h2.type = 'O'
inner join areas on a.id = h.area_id
where h2.person_id is null and h.type = 'I'