I have one table things full of items listed by ItemID. Given an ItemID, I need to get the record with the ItemID and all other items with the same name.
In the sample data below, given the ItemID of 1, I need to select all records with the same name (in this case, "poptarts") as ItemID 1, including the record with ItemID 1.
ItemID = 1 name = poptarts
ItemID = 7 name = poptarts
ItemID = 8 name = cheddar
ItemID = 323 name = poptarts
select a.ItemID, a.name from things where a.ItemID = '1'
UNION
select b.ItemID, b.name from things where b.name = a.name
The SQL I've written above however does not pass a.name to the second select. Is there any way to pass the first name value to the second select? I would like for the statement to return itemid = 1 as the first row and 7 and 323 as the other rows.
UNION is only really used to concatenate two distinct sets. Based on your example, you could probably do something like this:
SELECT a.ItemID, a.Name
FROM things a
WHERE name IN (SELECT name FROM things WHERE itemID = 1)
There are lots of ways to write this kind of query and will depend on which flavor of SQL you're using but this should be more or less universal.
select
a.itemID,
a.name
from
things a
where a.name in (
select name
from things b
where b.itemID = '1'
)
SELECT this.name, this.id, that.id
FROM thing this
LEFT JOIN thing that ON that.name=this.name AND that.id <> this.id
WHERE this.id = 1
;
NOTE: this also selects the this-rows that have no twin records; in that case the that.id will be NULL. If you want to suppress the records without twin-records, remove the LEFT.
UPDATE: added the id <> id clause to suppres the obvious match.
If you really only have one table, no need to bring it in twice, UNION, or anything fancy like htat.
SELECT
name
FROM
a --assuming this is your only table
GROUP BY
itemID, name
HAVING
itemID = '1'
Related
I currently have a select statement which returns Customer Numbers that are primary.
What I would like to do for those returned, I would like to have another column that is for customerRole. For customerRole the value should be either primary or secondary.
My current select statement is bringing those that are primary and based on that select statement. I would like to have a customerRole column that shows these as primary. Then I would like to use this same column with my other select statement to show those that are secondary. When they are ran together I would like to see something like:
accountNumber: 1234455 CustomerRole: Primary
AccountNumber: 3245454 CustomerRole: Secondary
Does anyone know how I can accomplish this? Here is my select to get primary numbers:
SELECT
F.CustomerNumber
FROM ods.CustomerFact F
JOIN ods.holderDim AD
ON F.HolderRowNumber = AD.HolderRowNumber
JOIN ods.holderOwesDim B
ON F.PrimaryHolderNumber = B.SecondaryHolderNumber
I think you want a CASE expression:
SELECT c.CustomerNumber,
(CASE WHEN EXISTS (SELECT 1
FROM ods.holderDim hd
WHERE c.PrimaryHolderNumber = hd.SecondaryHolderNumber
) AND
EXISTS (SELECT 1
FROM ods.holderOwesDim hod
WHERE c.PrimaryHolderNumber = hod.SecondaryHolderNumber
THEN 'Primary' ELSE 'Secondary'
)
END) as role
FROM ods.CustomerFact c;
There is a few posts about it but i can't make it work...
I just want to select just one row per ID, something like row_number() over Partition in oracle but in access.
ty
SELECT a.*
FROM DATA as a
WHERE a.a_sku = (SELECT top 1 b.a_sku
FROM DATA as b
WHERE a.a_sku = b.a_sku)
but i get the same table Data out of it
Sample of table DATA
https://ibb.co/X4492fY
You should try below query -
SELECT a.*
FROM DATA as a
WHERE a.Active = (SELECT b.Active
FROM DATA as b
WHERE a.a_sku = b.a_sku
AND a.Active < b.Active)
If you don't care which record within each group of records with a matching a_sku values is returned, you can use the First or Last functions, e.g.:
select t.a_sku, first(t.field2), first(t.field3), ..., first(t.fieldN)
from data t
group by t.a_sku
I have a table (lets call it "Items") that contains a set of names, groups and statuses. For example
Name | Group | Status
FF A ON
GG A OFF
HH A UNKN
ZZ B ON
YY B OFF
I am trying to aggregate the status of all records in a given group, by taking the most relevant status (in order by relevance: UNKN, OFF, ON).
Edit 1: These statuses are only examples, and their names and orders could change in my application, so that should be configurable in the query.
For example, if I query for the overall status of Group A, the status should be UNKN, and if I query for Group B, the status should be OFF.
Edit 2: It is possible that there are multiples of the same status for a group. For example two records that are UNKN.
The query I have managed is to select all items from a group. For example Group A:
SELECT Items.[Group], Items.[Status]
FROM Items
WHERE (((Items.[Group])="A"));
Produces:
Name | Group | Status
FF A ON
GG A OFF
HH A UNKN
but I can't boil it down to the single most relevant status for every group. I have tried to use CASE WHEN and IF EXISTS but I can't get it to work. Any input?
Edit 3:
As an example of the desired output for the overall group status:
Group | OverallStatus
A UNKN
B OFF
If you can build another table, a simple solution would be:
Add another table with the values in the order you want.
Then, just build a query like this:
SELECT TOP 1 Table1.*, Table2.VALUE
FROM Table1 INNER JOIN Table2 ON Table1.status = Table2.STATUS
WHERE Table1.group="A"
ORDER BY Tabla2.VALUE DESC
If the status changes or are added new ones, or you need a new order, just refresh the new table.
EDIT
Acording to the new info by OP, the query can be write in another way. The previous query take into account showing all the record in table1.
If you only need the group and the "max" status, you can use something like this:
SELECT A.group, Table2.STATUS
FROM (SELECT Table1.group, Max(Table2.VALUE) AS MaxVALUE
FROM Table1 INNER JOIN Table2 ON Tabla1.status = Table2.STATUS
GROUP BY Table1.group) as A INNER JOIN Table2 ON A.MaxVALUE= Table2.VALUE;
Use conditional aggregation and some other logic:
select grp,
switch(sum(iif(status = "UNK", 1 0) > 0, "UNK", -- any unknowns
sum(iif(status = "OFF", 1, 0) > 0, "OFF", -- any offs
"ON"
) as group_status
from items
group by grp;
This counts the number of each status and then uses that to determine the overall group status. Your question is not really explicit about the rules, but I think these capture what you are trying to do. It should be easy enough to modify for other rules.
Using the "length" as gauge, this should fit Access SQL:
Select *
From Items
Where Items.Name = (
Select Top 1 T.Name
From Items As T
Where T.Group = Items.Group
Order By Len(T.Status) Desc)
Assuming that the status column will have only three distinct values as shown in data example, you can try below query:
SELECT *
FROM ITEMS
WHERE (GROUP,LENGTH(STATUS)) IN (
SELECT GROUP,MAX(LENGTH(STATUS))
FROM ITEMS
GROUP BY GROUP)
Thanks,
Amitabh
I've got a many-to-many setup where there are items and item names(based on languageID)
I want to retrieve all names for a set id, where the name is replace with an alternate name (same itemID, but different languageID) when name is NULL.
I've set up a table that receives all combinations of itemids and itemnames, even the missing ones, and have the name ordered by an hasName flag, that is set based on name existing to 0,1 or 2. 0 means languageId and name exist, 1 means only name exists, and 2 means neither. I then sort the results: ORDER BY itemId, hasName, languageId this works well enough, because the top 1 row of every itemid meats the critera, and I can just pull that.
However I still need to process other queries using the result, so this doesn't work well, because as soon as I use a WITH statement, the order cannot be used, so it breaks the functionality
What I'm using instead is a join, where I select the top 1 matching row on the ordered table
the problem there is that the time to execute goes up 10x
any ideas what else I could try?
using SQL server 10.50
the slow query:
SELECT
*,
(SELECT top 1 ItemName FROM ItemNameMultiLang x WHERE x.ItemId = tc.ItemId ORDER BY ItemID, hasName, LangID) AS ItemName
FROM ItemCategories tc
ORDER BY ItemId
One way to approach this is with row_number(), so you can get the first row from itemNameMultiLang, which is what you want:
SELECT tc.*, inml.ItemName
FROM ItemCategories tc left outer join
(select inml.*, row_number() over (partition by inml.ItemId order by hasname, langId) as seqnum
from ItemNameMultiLang
) inml
on tc.ItemItem = inml.ItemId and
inml.seqnum = 1
ORDER BY tc.ItemId;
I would like to retrieve all rows matching a set of conditions on the same column. But I would like the rows only if ALL the conditions are good, and no row if only one condition fails.
For example, taking this table:
|id|name|
---------
|1 |toto|
|2 |tata|
I would like to be able to request if "tata" && "toto" are in this table. But when asking if "tata" and "tuto" are in, I would like an empty response if one of argument is in not in the table, for example asking if "toto" && "tutu" are included in the table.
How can I do that ?
Currently, I'am doing one query per argument, which is not very efficient. I tried several solutions including a subselect or a group+having, but no one is working like I want.
thanks for your support !
cheers
This isn't the most efficient way, but this query would work.
SELECT * FROM table_name
WHERE (name = 'toto' OR name = 'tata')
AND ( SELECT COUNT(*) FROM table_name WHERE name = 'toto') > 0
AND ( SELECT COUNT(*) FROM table_name WHERE name = 'tata') > 0
This is a little vague. If the names are unique, you could count the matching rows that match a where clause:
where name='toto' or name='tata'
If the count is 2, then you know both matched. If name is not unique you could potentially select the first ID (select top 1 id ...) that matches each in a union and count those with an outer select.
Even if you had an arbitrary number of names to match, you could create a stored procedure or code in whatever top-level language you are using to build the select statement.
SELECT 1 AS found FROM hehe
WHERE 1 IN (SELECT 1 FROM hehe WHERE name='tata')
AND 1 IN (SELECT 1 FROM hehe WHERE name='toto')
If name is unique you can simplify to:
SELECT *
FROM tbl
WHERE name IN ('toto', 'tata')
AND (SELECT count(*) FROM tbl WHERE name IN ('toto', 'tata')) > 1;
If it isn't:
SELECT *
FROM tbl
WHERE name IN ('toto', 'tata')
AND EXISTS (SELECT * FROM tbl WHERE name = 'toto')
AND EXISTS (SELECT * FROM tbl WHERE name = 'tata');
Or, in PostgreSQL, MySQL and possibly others:
SELECT *
FROM tbl
WHERE name IN ('toto', 'tata')
AND (SELECT count(DISTINCT name) FROM tbl WHERE name IN ('toto', 'tata')) > 1;