I have a table that looks like
player:string | team:string | position:string
jim | packers | qb
jack | patriots | rb
mark | texans | te
tim | packers | wr
I want to select the team names that don't have a player that plays the "qb" position. In this case the results would ouput the team names patriots and texans. Below is what I currently have.
select distinct team
from Players
where position <> 'qb'
group by team
You need to check the <> 'qb' for each of the groups you form, so it can't be in the normal where clause, as this applies to the entire table. I would write this with a subquery:
select distinct team
from Players
where team not in (
select team
from Players
where position = 'qb'
);
Related
I Have a query that finds a table, here's an example one.
Name |Age |Hair |Happy | Sad |
Jon | 15 | Black |NULL | NULL|
Kyle | 18 |Blonde |YES |NULL |
Brad | 17 | Blue |NULL |YES |
Name and age come from one table in a database, hair color comes from a second which is joined, and happy and sad come from a third table.My goal would be to make the first line of the chart like this:
Name |Age |Hair |Happy |Sad |
Jon | 15 |Black |Yes |Yes |
Basically I want to get rid of the rows under the first and get the non NULL data joined to the right. The problem is that there is no column where the Yes values are on the Jon row, so I have no idea how to get them there. Any suggestions?
PS. With the data I am using I can't just put a 'YES' in the 'Jon' row and call it a day, I would need to find the specific value from the lower rows and somehow get that value in the boxes that are NULL.
Do you just want COALESCE()?
COALESCE(Happy, 'Yes') as happy
COALESCE() replaces a NULL value with another value.
If you want to join on a NULL value work with nested selects. The inner select gets an Id for NULLs, the outer select joins
select COALESCE(x.Happy, yn_table.description) as happy, ...
from
(select
t1.Happy,
CASE WHEN t1.Happy is null THEN 1 END as happy_id
from t1 ...) x
left join yn_table
on x.xhappy_id = yn_table.id
If you apply an ORDER BY to the query, you can then select the first row relative to this order with WHERE rownum = 1. If you don't apply an ORDER BY, then the order is random.
After reading your new comment...
the sense is that in my real data the yes under the other names will be a number of a piece of equipment. I want the numbers of the equipment in one row instead of having like 8 rows with only 4 ' yes' values and the rest null.
... I come to the conclusion that this a XY problem.
You are asking about a detail you think will solve your problem, instead of explaining the problem and asking how to solve it.
If you want to store several pieces of equipment per person, you need three tables.
You need a Person table, an Article table and a junction table relating articles to persons to equip them. Let's call this table Equipment.
Person
------
PersonId (Primary Key)
Name
optional attributes like age, hair color
Article
-------
ArticleId (Primary Key)
Description
optional attributes like weight, color etc.
Equipment
---------
PersonId (Primary Key, Foreign Key to table Person)
ArticleId (Primary Key, Foreign Key to table Article)
Quantity (optional, if each person can have only one of each article, we don't need this)
Let's say we have
Person: PersonId | Name
1 | Jon
2 | Kyle
3 | Brad
Article: ArticleId | Description
1 | Hat
2 | Bottle
3 | Bag
4 | Camera
5 | Shoes
Equipment: PersonId | ArticleId | Quantity
1 | 1 | 1
1 | 4 | 1
1 | 5 | 1
2 | 3 | 2
2 | 4 | 1
Now Jon has a hat, a camera and shoes. Kyle has 2 bags and one camera. Brad has nothing.
You can query the persons and their equipment like this
SELECT
p.PersonId, p.Name, a.ArticleId, a.Description AS Equipment, e.Quantity
FROM
Person p
LEFT JOIN Equipment e
ON p.PersonId = e.PersonId
LEFT JOIN Article a
ON e.ArticleId = a.ArticleId
ORDER BY p.Name, a.Description
The result will be
PersonId | Name | ArticleId | Equipment | Quantity
---------+------+-----------+-----------+---------
3 | Brad | NULL | NULL | NULL
1 | Jon | 4 | Camera | 1
1 | Jon | 1 | Hat | 1
1 | Jon | 5 | Shoes | 1
2 | Kyle | 3 | Bag | 2
2 | Kyle | 4 | Camera | 1
See example: http://sqlfiddle.com/#!4/7e05d/2/0
Since you tagged the question with the oracle tag, you could just use NVL(), which allows you to specify a value that would replace a NULL value in the column you select from.
Assuming that you want the 1st row because it contains the smallest age:
- wrap your query inside a CTE
- in another CTE get the 1st row of the query
- in another CTE get the max values of Happy and Sad of your query (for your sample data they both are 'YES')
- cross join the last 2 CTEs.
with
cte as (
<your query here>
),
firstrow as (
select name, age, hair from cte
order by age
fetch first row only
),
maxs as (
select max(happy) happy, max(sad) sad
from cte
)
select f.*, m.*
from firstrow f cross join maxs m
You can try this:
SELECT A.Name,
A.Age,
B.Hair,
C.Happy,
C.Sad
FROM A
INNER JOIN B
ON A.Name = B.Name
INNER JOIN C
ON A.Name = B.Name
(Assuming that Name is the key columns in the 3 tables)
I'm still very new to MS-SQL. I have a simple table and query that that is getting the best of me. I know it will something fundamental I'm overlooking.
I've changed the field names but the idea is the same.
So the idea is that every time someone signs up they get a RegID, Name, and Team. The names are unique, so for below yes John changed teams. And that's my trouble.
Football Table
+------------+----------+---------+
| Max_RegID | Name | Team |
+------------+----------+---------+
| 100 | John | Red |
| 101 | Bill | Blue |
| 102 | Tom | Green |
| 103 | John | Green |
+------------+----------+---------+
With the query at the bottom using the Max_RegID, I was expecting to get back only one record.
+------------+----------+---------+
| Max_RegID | Name | Team |
+------------+----------+---------+
| 103 | John | Green |
+------------+----------+---------+
Instead I get back below, Which seems to include Max_RegID but also for each team. What am I doing wrong?
+------------+----------+---------+
| Max_RegID | Name | Team |
+------------+----------+---------+
| 100 | John | Red |
| 103 | John | Green |
+------------+----------+---------+
My Query
SELECT
Max(Football.RegID) AS Max_RegID,
Football.Name,
Football.Team
FROM
Football
GROUP BY
Football.RegID,
Football.Name,
Football.Team
EDIT* Removed the WHERE statement
The reason you're getting the results that you are is because of the way you have your GROUP BY clause structured.
When you're using any aggregate function, MAX(X), SUM(X), COUNT(X), or what have you, you're telling the SQL engine that you want the aggregate value of column X for each unique combination of the columns listed in the GROUP BY clause.
In your query as written, you're grouping by all three of the columns in the table, telling the SQL engine that each tuple is unique. Therefore the query is returning ALL of the values, and you aren't actually getting the MAX of anything at all.
What you actually want in your results is the maximum RegID for each distinct value in the Name column and also the Team that goes along with that (RegID,Name) combination.
To accomplish that you need to find the MAX(ID) for each Name in an initial data set, and then use that list of RegIDs to add the values for Name and Team in a secondary data set.
Caveat (per comments from #HABO): This is premised on the assumption that RegID is a unique number (an IDENTITY column, value from a SEQUENCE, or something of that sort). If there are duplicate values, this will fail.
The most straight forward way to accomplish that is with a sub-query. The sub-query below gets your unique RegIDs, then joins to the original table to add the other values.
SELECT
f.RegID
,f.Name
,f.Team
FROM
Football AS f
JOIN
(--The sub-query, sq, gets the list of IDs
SELECT
MAX(f2.RegID) AS Max_RegID
FROM
Football AS f2
GROUP BY
f2.Name
) AS sq
ON
sq.Max_RegID = f.RegID;
EDIT: Sorry. I just re-read the question. To get just the single record for the MAX(RegID), just take the GROUP BY out of the sub-query, and you'll just get the current maximum value, which you can use to find the values in the rest of the columns.
SELECT
f.RegID
,f.Name
,f.Team
FROM
Football AS f
JOIN
(--The sub-query, sq, now gets the MAX ID
SELECT
MAX(f2.RegID) AS Max_RegID
FROM
Football AS f2
) AS sq
ON
sq.Max_RegID = f.RegID;
Use row_number()
select * from
(SELECT
Football.RegID AS Max_RegID,
Football.Name,
Football.Team, row_number() over(partition by name order by Football.RegID desc) as rn
FROM
Football
WHERE
Football.Name = 'John')a
where rn=1
simply you can edit your query below way
SELECT *
FROM
Football f
WHERE
f.Name = 'John' and
Max_RegID = (SELECT Max(Football.Max_RegID) where Football.Name = 'John'
)
or
if sql server simply use this
select top 1 * from Football f
where f.Name = 'John'
order by Max_RegID desc
or
if mysql then
select * from Football f
where f.Name = 'John'
order by Max_RegID desc
Limit 1
You need self join :
select f1.*
from Football f inner join
Football f1
on f1.name = f.name
where f.Max_RegID = 103;
After re-visit question, the sample data suggests me subquery :
select f.*
from Football f
where name = (select top (1) f1.name
from Football f1
order by f1.Max_RegID desc
);
So I got this very inconsistent record for example(just an example):
Manager | Associate | FTE | Revenue
Bob | James | Y | 500
Bob | James | NULL | 100
Bob | James | Y | 200
Kelly | Rick | N | 200
Kelly | Rick | N | 500
Kelly | Rick | NULL | 300
So the goal i wanted was to Sum up the revenue, but the problem is in the group by the nulls kinda split them apart. So i want to write an update statement saying basically "well Looks like James and Bob are both FTE, so lets update that to Y and Kelly and rick are not so update that to no."
How can i fix this? Using MSAccess and of course my table is a lot biger with a lot of different name combos.
You can "impute" the value by using an aggregation function. The following query aggregates by manager/associate and takes the maximum value of fte. This is then joined back to the original data to do the calculation:
select ma.fte, sum(Revenue)
from table as t inner join
(select manager, associate, max(fte) as fte
from table as t
group by manager, associate
) as ma
on t.manager = ma.manager and
t.associate = ma.associate
group by ma.fte;
EDIT:
Immediately after posting this, I realized the join is not necessary. Two aggregations are sufficient:
select ma.fte, sum(Revenue)
from (select manager, associate, max(fte) as fte, sum(Revenue) as Revenue
from table as t
group by manager, associate
) as ma
group by ma.fte;
You haven't given the primary key columns, which makes it a bit harder. I've called it {id} below.
With the nulls, many SQL dialects have an "IfNull" function, but it seems MS-Access does not. You can get the same effect this way:
IIF(ISNULL(column),0,column)
You'd use that in a SELECT as so:
SELECT IIF(ISNULL(Revenue),0,Revenue) FROM ...
For a one-off fix you could do this:
UPDATE {table} SET Revenue=0 WHERE Revenue = NULL;
Doing a join to get the FTE from another row is more complex, and I don't have access handy to see just what the limits and syntax are. The easy to understand way is a nested query:
UPDATE {table} a SET FTE = (SELECT max(FTE) FROM {table} b WHERE FTE IS NOT NULL AND a.{id} = b.{id})
The max() function works here because it ignores nulls, where some other functions return null if you pass a null in.
I am running a query which get data from multiple tables and condition with inner join. I want this query to group by a single column but when i do it i get: ORA-00979: not a GROUP BY expression, error message. Well as per my understanding this is because of other table column which not support this group by.
This query I am writing to generate reports from iReport. for example below column I am getting from three different tables details, food and hobbies, I want to combine this result group by name...
Name | food | hobby
-------------------------
peter | chips | traveling
peter | burger | tennis
peter | burger | writing
Dave | lamb | game
Dave | kebab | reading
fine result that i want will be: here I only want to get name once and respective all values (even when it is duplicate) and other duplicate name rows should not contains any data..please help me with this sql query.. if there's any option in iReport to do this please let me know or any other keyword/inner queries in sql, i tried there group by option while you design table in it.. but it is not working... thanks in advance
Name | food | hobby
--------------------------------------------------------------
peter | chips | traveling
------ | burger | tennis
------ | burger | writing
Dave | lamb | game
-------| kebab | reading
Query for it:
SELECT org.Location AS organisation_location, list.listId as list_listid, org.Centre AS org_Centre,
org.Department AS org_Department, org.Position AS org_Position, q.content AS q_content,
q.dueTime AS q_dueTime, a.submitted_date AS a_submitted_date, list.frequency AS list_frequency,
a.comments AS a_comments, a.userid AS a_userid, a.submitted as a_submitted
FROM org INNER JOIN list ON org.id = list.org_id INNER JOIN q ON klist.id = q.list_id INNER JOIN a ON qid = a.q_id
WHERE a.submitted=0 andlist.listid='xyz'
I want to group the same by list.listid
Your query doesn't contain "Name", "Food" or "Hobby" so I'm little confused, but following query should help you create your own to achieve desired goal.
SELECT
CASE WHEN X.VERIFY_COL = 1 THEN X.YOUR_UNIQUE_COL ELSE NULL END AS YOUR_COL_NAME,
* FROM
(SELECT
ROW_NUMBER() OVER (PARTITION BY YOUR_UNIQUE_COL ORDER BY YOUR_UNIQUE_COL) AS VERIFY_COL,
* FROM YOUR_VIEW
) X
You can partition your data by column you would like to have only once in your query YOUR_UNIQUE_COL. Then easy take advantage of ROW_COUNT() to set NULL for all rows' names with ROW_COUNT() > 1.
Please note it's SQL SERVER solution. What database engine do you use?
I don't think you need to group your data, try deactivating "Print repeated values"
Considering the tables below, what is the best way to only return the team membership and its related player, but only one player from each team? The important part to note is that selection needs to be based on a given set of player ids. That is the starting point.
Using the example below I would have the player ids: 1,2,3 (among others) and what I need to end up with is the unique memberships from a list of user ids(1,2,3 in this case). I would want to end up with team_memberships with id 1 & 2
Thanks!
player
id | name
1 | bob
2 | joe
3 | tom
team_memberships
id | team_id | player_id
1 | 1 | 1
2 | 2 | 2
3 | 1 | 3
team
id | name
1 | jets
2 | kings
Do you mean
Select team_id, Min(player_id)
From team_Memberships
Where player_id In (1,2,3)
Group By team_id
If the player selected needs to be based on some other attribute in the players table, then:
Select team_id,
(Select Min(player_id) -- in case more than one player satisfies criterion
From players
where playerId = m.Player_Id
And [Some other ctiterion]) playerId
From team_Memberships m
Where player_id In (1,2,3)
Group By team_id