I would like to add the count result of a 2nd query to the result set which queries the 1st table and connect this subquery with the ID of the 1st Table result. This simplified code explains it:
Select
ID_Field_Table1,
(Select Count(x)
From Table2
Where ID_Field_Table2 = ID_Field_Table1) As mycount
From Table1
What is the correct syntax?
Thanks
This code is simplified but the construction is the same. In my DB the ID_Field_Table2 and ID_Field_Table1 have the same name (let's say ID_Field). If I use this same Name, the SubQuery goes like "...Where ID_Field = ID_Field.." and this always Returns a Reslut, because it is not connecting the queries ("Select a Where x = x" returns any record in the table 2).
Select
ID_Field AS ID1,
(Select Count(x)
From Table2
Where ID_Field = ID1) As mycount
From Table1
It just returns an error, saying that ID1 does not exist.
When I use the original name of the columns (which are the same), the result is wrong
When I us an alias, an error occurs
So I think the query is wrong at all.
Well, you can't use an alias defined in the select clause, but you can use the aliases defined in the from clause:
Select
ID_Field AS ID1,
(Select Count(x)
From Table2
Where ID_Field = t1.ID_Field) As mycount
From Table1 t1
You can also do it without an alias, since the sub query is for a different table:
Select
ID_Field AS ID1,
(Select Count(x)
From Table2
Where ID_Field = Table1.ID_Field) As mycount
From Table1
However, I suspect a query using left join to a derived table as suggested in esta's answer would have better performance.
Something like this?
Select
Table1.ID_Field_Table1,
T2.MYCOUNT
From Table1
LEFT JOIN (SELECT ID_Field_Table2, COUNT(x) AS MYCOUNT FROM TABLE2 GROUP BY ID_FIELD_TABLE2) T2 ON T2.ID_Field_Table2=Table1.ID_Field_Table1
Try This query once it may help you.
Select ID_Field_Table1,COUNT_NBR
cross apply
(
Select Count(x) as COUNT_NBR
From Table2
Where ID_Field_Table2 = ID_Field_Table1
group by ID_Field_Table1
) As mycount
From Table1
Related
I am trying to do below
Table 1
Table 2
I am writing a query like below to ensure that if any of the NOT IN satisfies, those records should be filtered out.
SELECT * FROM TABLE1
WHERE TABLE1."DEPTID" NOT IN (SELECT TABLE2."DEPTID" FROM TABLE2)
OR
TABLE1."EMPCOUNTRY" NOT IN (SELECT TABLE2."EMPCOUNTRY" FROM TABLE2)
OR
TABLE1."EMPZONE" NOT IN (SELECT TABLE2."EMPZONE" FROM TABLE2)
But it errors out
What am I doing wrong?
Edited : Exact Query is working with nvl , but result set is not as per requirement.
SELECT * FROM TABLE1 AS T1
WHERE
(
UPPER (T1."DEPTID") NOT IN
(SELECT UPPER (nvl (T2."DEPTID", '')) FROM TABLE2 AS T2)
OR
UPPER (T1."EMPZONE") NOT IN
(SELECT UPPER (nvl (T2."EMPZONE",'')) FROM TABLE2 AS T2)
)
Result - set is not as per requirement, it should filter out if there any DEPTID in the Table2 or if there is any EMPZONE in table 2 or both etc.
What should be the best way to achieve this?
I think the issue is about NULL values coming from the subqueries. Could you try to use something like this?
SELECT * FROM TABLE1 AS T1
WHERE
(
NOT EXISTS (SELECT 1 FROM TABLE2 T2 WHERE equal_null( UPPER(T1."DEPTID"), UPPER(T2."DEPTID")) )
OR
NOT EXISTS (SELECT 1 FROM TABLE2 T2 WHERE equal_null( UPPER(T1."EMPZONE"), UPPER(T2."EMPZONE")) )
);
Also here is a sample to demonstrate why you can't use NOT IN with a subquery returning NULL values:
create table NULL_TABLE ( v varchar);
insert into NULL_TABLE values (NULL),('ABC');
create or replace table MAIN_TABLE ( v varchar);
INSERT INTO MAIN_TABLE values
('Jack'),('Joe'),('ABC');
select * from MAIN_TABLE
where v NOT IN (select v FROM NULL_TABLE);
The last query returns NULL, because we can't determine if a value does not exist in series of numbers where some of them are not known - the last WHERE clause.
When using NOT IN the subquery should not allow null values as reselut, second conditions to happen all at once should be joined with AND instead of OR.
NOT (cond1 OR cond2 OR cond3)
<=>
(NOT cond1) AND (NOT cond2) AND (NOT cond3)
De Morgan's law: "The negation of a disjunction is the conjunction of the negations"
The final query should rather be:
SELECT *
FROM TABLE1 AS T1
WHERE T1."DEPTID" NOT IN (SELECT T2."DEPTID" FROM TABLE2 T2
WHERE T2."DEPTID" IS NOT NULL)
AND T1."EMPCOUNTRY" NOT IN (SELECT T2."EMPCOUNTRY" FROM TABLE2 T2
WHERE T2."EMPCOUNTRY" IS NOT NULL)
AND T1."EMPZONE" NOT IN (SELECT T2."EMPZONE" FROM TABLE2 T2
WHERE T2."EMPZONE" IS NOT NULL);
This query is fine works.
SELECT * FROM TABLE WHERE 330110042 IN (iItem01,iItem02,iItem03,iItem04,iItem05,iItem_1,iItem_2,iItem_3,iItem_4,iItem_5,iItem_6,iItem_7,iItem_8,iItem_9,iItem_10,iItem_11,iItem_12,iItem_13,iItem_14,iItem_15,iItem_16,iItem_17,iItem_18,iItem_19,iItem_20,iItem_21,iItem_22,iItem_23,iItem_24,iItem_25,iItem_26,iItem_27,iItem_28,iItem_29,iItem_30)
But this query didnt work.
SELECT * FROM TABLE WHERE 330110042, 330110002, 330110002 IN (iItem01,iItem02,iItem03,iItem04,iItem05,iItem_1,iItem_2,iItem_3,iItem_4,iItem_5,iItem_6,iItem_7,iItem_8,iItem_9,iItem_10,iItem_11,iItem_12,iItem_13,iItem_14,iItem_15,iItem_16,iItem_17,iItem_18,iItem_19,iItem_20,iItem_21,iItem_22,iItem_23,iItem_24,iItem_25,iItem_26,iItem_27,iItem_28,iItem_29,iItem_30)
How i work in SQL Server?
It's difficult to tell your exact goal here, but one possibility would be to turn the list of values into a table structure of its own. A Common Table Expression might work:
;WITH Ids AS
(
SELECT 330110042 AS Id
UNION ALL
SELECT 330110002
)
SELECT t.*
FROM [Table] t
INNER JOIN Ids i ON t.iItem01 = i.Id OR t.iItem02 = i.Id OR...
But, maybe a solution with UNPIVOT would be more elegant. I presume that your table has a primary key column called Id:
;WITH Unpivoted AS
(
SELECT Id, ColName, ColValue
FROM (SELECT Id, iItem01, iItem02, iItem03
FROM [Table] t) p
UNPIVOT
(ColValue FOR ColName IN (iItem01, iItem02, iItem03)) AS unpvt
)
SELECT t.*
FROM [Table] t
WHERE EXISTS (SELECT 1 FROM Unpivoted u
WHERE t.Id = u.Id
AND u.ColValue IN (330110042, 330110002))
Of course, you would add all the necessary columns. I added only the first three for this example.
I am writing a simple select subquery statement and it is not giving any result. Neither it is throwing any error.
My Sql query is like this -
select * from Table1
where id in (select ID from Table2 where user = 'xyz')
I tried with exists also, but not showing any result.
Appreciate your help.
It could be that the below subquery returns a empty list because the filter condition where user = 'xyz' doesn't matches any record
select ID from Table2 where user = 'xyz'
The outer query as below doesn't matches the condition where id in ()
select * from Table1 where id in ()
Thus returning an empty result set.
You can convert your posted query to be a INNER JOIN query like
select t1.*
from Table1 t1 join Table2 t2
on t1.id = t2.id
where t2.user = 'xyz';
As a test, try using LIKE operator instead of equality comparison
select * from Table1
where id in (select ID from Table2 where user like '%xyz%')
I have a SQL query where I have in my where clause a list into a IN condition.
Example of what I mean:
WHERE Id IN (11111,11112)
And what I try to do is the following: I have a linked server query where I have an IN clause.
And I have a subquery where I use a JOIN table to cross data but I need that in the IN condition use the same Id like the main query.
I hope you guys understand what I try to do:
Here's my code:
SELECT
Name,
Street,
Number,
(SELECT loginUser FROM [LinkedServer].[Database].[dbo].[Users] T1
INNER JOIN [LinkedServer].[Database].[dbo].[General] T2
ON T2.IdUser = T1.Id
WHERE T2.Id IN (11111,11112,11113,11114,11115)
)
FROM [LinkedServer].[Database].[dbo].[General]
WHERE Id IN (11111,11112,11113,11114,11115)
i get this error:
Subquery returned more than 1 value. This is not permitted when the
subquery follows =, !=, <, <= , >, >= or when the subquery is used as
an expression.
To reuse same set of ids you could use Table Variable.
DECLARE #T TABLE(ID INT);
INSERT INTO T
SELECT 11111 UNION ALL SELECT 11112 ....
then
SELECT * FROM
(SELECT Varchar1,
Varchar2,
Varchar3, loginUser FROM [LinkedServer].[Database].[dbo].[Table] T1
INNER JOIN [LinkedServer].[Database].[dbo].[Table] T2
ON T2.INT1 = T1.INT1
WHERE T2.Id IN (select id from #T)
) AS X WHERE
X.Id IN (select id from #T)
Consider using a join instead of a correlated-subquery:
SELECT General.Name
, General.Street
, General.Number
, Users.loginUser
FROM [LinkedServer].[Database].[dbo].[General]
LEFT
JOIN [LinkedServer].[Database].[dbo].[Users]
ON Users.Id = General.IdUser
WHERE General.Id IN (11111, 11112, 11113, 11114, 11115)
This will return the loginUser where possible.
i have solved it finally.
The Problem was that the subquery haven´t a where condition to extract a specific Id.
Without a WHERE Condition the query return more than 1 value.
What i have done:
Thanks for the advice and his solution Author: "LIUFA".
With a combination of his code and some correction of my code i get the solution.
I have add one more column Id and give it an alias. In the subquery i have done the select from the Temp table
using a where condition. And its Working. Perfect.
Hope that this solution can help somebody to solved a related issue.
Finally Code:
DECLARE #T TABLE(ID INT);
INSERT INTO #T
Select ReferenceId From MyBigData
SELECT,
A.Id,
Name,
Street,
Number,
(SELECT loginUser FROM [LinkedServer].[Database].[dbo].[Users] T1
INNER JOIN [LinkedServer].[Database].[dbo].[General] T2
ON T2.IdUser = T1.Id
WHERE T2.Id IN (SELECT Id FROM #T WHERE Id = A.Id)
)
FROM [LinkedServer].[Database].[dbo].[General]
WHERE Id IN (SELECT Id FROM #T)
I've got two tables:
TableA
------
ID,
Name
TableB
------
ID,
SomeColumn,
TableA_ID (FK for TableA)
The relationship is one row of TableA - many of TableB.
Now, I want to see a result like this:
ID Name SomeColumn
1. ABC X, Y, Z (these are three different rows)
2. MNO R, S
This won't work (multiple results in a subquery):
SELECT ID,
Name,
(SELECT SomeColumn FROM TableB WHERE F_ID=TableA.ID)
FROM TableA
This is a trivial problem if I do the processing on the client side. But this will mean I will have to run X queries on every page, where X is the number of results of TableA.
Note that I can't simply do a GROUP BY or something similar, as it will return multiple results for rows of TableA.
I'm not sure if a UDF, utilizing COALESCE or something similar might work?
Even this will serve the purpose
Sample data
declare #t table(id int, name varchar(20),somecolumn varchar(MAX))
insert into #t
select 1,'ABC','X' union all
select 1,'ABC','Y' union all
select 1,'ABC','Z' union all
select 2,'MNO','R' union all
select 2,'MNO','S'
Query:
SELECT ID,Name,
STUFF((SELECT ',' + CAST(T2.SomeColumn AS VARCHAR(MAX))
FROM #T T2 WHERE T1.id = T2.id AND T1.name = T2.name
FOR XML PATH('')),1,1,'') SOMECOLUMN
FROM #T T1
GROUP BY id,Name
Output:
ID Name SomeColumn
1 ABC X,Y,Z
2 MNO R,S
1. Create the UDF:
CREATE FUNCTION CombineValues
(
#FK_ID INT -- The foreign key from TableA which is used
-- to fetch corresponding records
)
RETURNS VARCHAR(8000)
AS
BEGIN
DECLARE #SomeColumnList VARCHAR(8000);
SELECT #SomeColumnList =
COALESCE(#SomeColumnList + ', ', '') + CAST(SomeColumn AS varchar(20))
FROM TableB C
WHERE C.FK_ID = #FK_ID;
RETURN
(
SELECT #SomeColumnList
)
END
2. Use in subquery:
SELECT ID, Name, dbo.CombineValues(FK_ID) FROM TableA
3. If you are using stored procedure you can do like this:
CREATE PROCEDURE GetCombinedValues
#FK_ID int
As
BEGIN
DECLARE #SomeColumnList VARCHAR(800)
SELECT #SomeColumnList =
COALESCE(#SomeColumnList + ', ', '') + CAST(SomeColumn AS varchar(20))
FROM TableB
WHERE FK_ID = #FK_ID
Select *, #SomeColumnList as SelectedIds
FROM
TableA
WHERE
FK_ID = #FK_ID
END
In MySQL there is a group_concat function that will return what you're asking for.
SELECT TableA.ID, TableA.Name, group_concat(TableB.SomeColumn)
as SomColumnGroup FROM TableA LEFT JOIN TableB ON
TableB.TableA_ID = TableA.ID
I think you are on the right track with COALESCE. See here for an example of building a comma-delimited string:
http://www.sqlteam.com/article/using-coalesce-to-build-comma-delimited-string
You may need to provide some more details for a more precise response.
Since your dataset seems kind of narrow, you might consider just using a row per result and performing the post-processing at the client.
So if you are really looking to make the server do the work return a result set like
ID Name SomeColumn
1 ABC X
1 ABC Y
1 ABC Z
2 MNO R
2 MNO S
which of course is a simple INNER JOIN on ID
Once you have the resultset back at the client, maintain a variable called CurrentName and use that as a trigger when to stop collecting SomeColumn into the useful thing you want it to do.
Assuming you only have WHERE clauses on table A create a stored procedure thus:
SELECT Id, Name From tableA WHERE ...
SELECT tableA.Id AS ParentId, Somecolumn
FROM tableA INNER JOIN tableB on TableA.Id = TableB.F_Id
WHERE ...
Then fill a DataSet ds with it. Then
ds.Relations.Add("foo", ds.Tables[0].Columns("Id"), ds.Tables[1].Columns("ParentId"));
Finally you can add a repeater in the page that puts the commas for every line
<asp:DataList ID="Subcategories" DataKeyField="ParentCatId"
DataSource='<%# Container.DataItem.CreateChildView("foo") %>' RepeatColumns="1"
RepeatDirection="Horizontal" ItemStyle-HorizontalAlign="left" ItemStyle-VerticalAlign="top"
runat="server" >
In this way you will do it client side but with only one query, passing minimal data between database and frontend
I tried the solution priyanka.sarkar mentioned and the didn't quite get it working as the OP asked. Here's the solution I ended up with:
SELECT ID,
SUBSTRING((
SELECT ',' + T2.SomeColumn
FROM #T T2
WHERE WHERE T1.id = T2.id
FOR XML PATH('')), 2, 1000000)
FROM #T T1
GROUP BY ID
Solution below:
SELECT GROUP_CONCAT(field_attr_best_weekday_value)as RAVI
FROM content_field_attr_best_weekday LEFT JOIN content_type_attraction
on content_field_attr_best_weekday.nid = content_type_attraction.nid
GROUP BY content_field_attr_best_weekday.nid
Use this, you also can change the Joins
SELECT t.ID,
t.NAME,
(SELECT t1.SOMECOLUMN
FROM TABLEB t1
WHERE t1.F_ID = T.TABLEA.ID)
FROM TABLEA t;
This will work for selecting from different table using sub query.
I have reviewed all the answers. I think in database insertion should be like:
ID Name SomeColumn
1. ABC ,X,Y Z (these are three different rows)
2. MNO ,R,S
The comma should be at previous end and do searching by like %,X,%