How Does Union/union All Work Inside SQL Server?
Apr 29, 2008
Why the sequence different?
select * from (
select id=3,[name]='Z'
union all select 1,'G'
union all select 2,'R'
union all select 4,'Z'
) as t
order by [name]
--result:
---------
--1 G
--2 R
--4 Z
--3 Z
select * from (
select id=3,[name]='Z'
union select 1,'G'
union all select 2,'R'
union all select 4,'Z'
) as t
order by [name]
--result:
----------
--1 G
--2 R
--3 Z--changed
--4 Z
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Jan 24, 2008
Hi there,
i've tried using the SELECT SQL sentence on PPC with UNION and INNER JOIN in combination with DATEDIFF function which works fine on ordinary SQL but obviously does not work on compact edition. Is there some workaround?
SQL sentence that works:
Code Snippet
SELECT * FROM
(
SELECT 'O' Type, O.Name , OC.Name Contact, Birthday FROM OutletContact OC
INNER JOIN Outlet O ON OC.OutletID=O.OutletID
UNION
SELECT 'W' Type, W.Name,WC.Name Contact, Birthday FROM WholesalerContact WC
INNER JOIN Wholesaler W ON W.WholesalerID=WC.WholesalerID
) S
WHERE Birthday IS NOT NULL AND (DATEDIFF(day,GETDATE(),Birthday) BETWEEN 0 AND 14)
Thanks for any hint or solution to my problem,
Gorazd
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Feb 16, 2008
im trying to do this
declare @count int
set @count=0
while @count<4
begin
set @count=@count+1
select *
from dbo.Categories
where CategoryPID=-1
union()
end
and i get a error
this is not the original code but i want to union all select statements
please help !!!
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Jun 12, 2014
SQL Server 2008 r2...
I have a query which does 3 selects and Union ALLs each to get a final result set. The performance is unacceptable - takes around a minute to run. If I remove the Union All so that the result sets are returned individually it returns all 3 from the query in around 6 seconds (acceptable performance).
Any way to join the result sets together without using Union All.
Each result set has exactly the same structure returned...
Query below [for reference]...
WITH cte AS (
SELECT A.[PoleID], ISNULL(B.[IsSpanClear], 0) AS [IsSpanClear], B.[SurveyDate], ROW_NUMBER() OVER (PARTITION BY A.[PoleID] ORDER BY B.[SurveyDate] DESC) rownum
FROM[UT_Pole] A
LEFT OUTER JOIN [UT_Surveyed_Pole] B ON A.[PoleID] = B.[PoleID]
[Code] .....
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Jul 20, 2005
I am having alot of trouble with a union query Im trying to create.The bizarre thing is I initially created this query and managed tosave it as a viewSELECT ID, DepartureDate, City, Country, Region,fkDepartureAirport, CONVERT(MONEY, Price) AS Price, '1' AS TypeFROM dbo.vHolidayUNION ALLSELECT ID, ValidTo, DestCity, Country, Region, fkDepartureAirport,Price, '2' AS TypeFROM dbo.vFlightHowever when I tried to update the view to this:SELECT ID, DepartureDate, fkCity, City, fkCountry, Country,Region, fkDepartureAirport, CONVERT(MONEY, Price) AS Price, '1' ASTypeFROM dbo.vHolidayUNION ALLSELECT ID, ValidTo, fkCity, DestCity, fkCountry, Country, Region,fkDepartureAirport, Price, '2'FROM dbo.vFlightit comes up with the error: view definition includes no output columnsor includes no items in the from clause.Any ideas??????All suggestions appreciatedAlly
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Jul 20, 2005
Hi,I have a database stored in MS SQL 2000 and an application written inVB5, which connects the database via JET/ODBC.I have a problem with the UNION statement.When I run a simple query like:"SELECT field1 FROM table1 UNION SELECT field2 FROM table2"I get the following error:"Runtime error 3078 - The Microsoft Jet database engine cannot find theinput table or query 'select field1 from table1'. Make sure it existsand that its name is spelled correctly."I can run the queries separately "SELECT field1 FROM table1" and "SELECTfield1 FROM table2", so that I'm sure table and field names are correctand I have permission to access them.Both field1 and field2 are the same type (int).If I run the query in MS SQL Query Analyzer, it works fine.It doesn't work only when I run it from VB/JET/ODBC.Has anyone already had this kind of problem?Any help will be highly appreciated!Thank you so much for the attention.--Posted via http://dbforums.com
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Mar 31, 2004
hi all
I have the following query which works fine when it's executed as a single query. but when i union the result of this query with other queries, it returns a different set of data.
any one know why that might be the case??
select top 100 max(contact._id) "_id", max(old_trans.date) "callback_date", 7 "priority", max(old_trans.date) "recency", count(*) "frequency" --contact._id, contact.callback_date
from topcat.class_contact contact inner join topcat.MMTRANS$ old_trans on contact.phone_num = old_trans.phone
where contact.phone_num is not null
and contact.status = 'New Contact'
group by contact._id
order by "recency" desc, "frequency" desc
i've included the union query here for completeness of the question
begin
declare @current_date datetime
set @current_date = GETDATE()
select top 100 _id, callback_date, priority, recency, frequency from
(
(
select top 10 _id, callback_date, 10 priority, @current_date recency, 1 frequency --, DATEPART(hour, callback_date) "hour", DATEPART(minute, callback_date) "min"
from topcat.class_contact
where status ='callback'
and (DATEPART(year, callback_date) <= DATEPART(year, @current_date))
and (DATEPART(dayofyear, callback_date) <= DATEPART(dayofyear, @current_date)) -- all call backs within that hour will be returned
and (DATEPART(hour, callback_date) <= DATEPART(hour, @current_date))
and (DATEPART(hour, callback_date) <> 0)
order by callback_date asc
--order by priority desc, DATEPART(hour, callback_date) asc, DATEPART(minute, callback_date) asc, callback_date asc
)
union
(
select top 10 _id, callback_date, 9 priority, @current_date recency, 1 frequency
from topcat.class_contact
where status = 'callback'
and callback_date is not null
and (DATEPART(year, callback_date) <= DATEPART(year, @current_date))
and (DATEPART(dayofyear, callback_date) <= DATEPART(dayofyear, @current_date))
and (DATEPART(hour, callback_date) <= DATEPART(hour, @current_date))
and (DATEPART(hour, callback_date) = 0)
order by callback_date asc
)
union
(
select top 10 _id, callback_date, 8 priority, @current_date recency, 1 frequency
from topcat.class_contact
where status = 'No Connect'
and callback_date is not null
and (DATEPART(year, callback_date) <= DATEPART(year, @current_date))
and (DATEPART(dayofyear, callback_date) <= DATEPART(dayofyear, @current_date))
and (DATEPART(hour, callback_date) <= DATEPART(hour, @current_date))
order by callback_date asc
)
union
(
select top 100 max(contact._id) "_id", max(old_trans.date) "callback_date", 7 "priority", max(old_trans.date) "recency", count(*) "frequency" --contact._id, contact.callback_date
from topcat.class_contact contact inner join topcat.MMTRANS$ old_trans on contact.phone_num = old_trans.phone
where contact.phone_num is not null
and contact.status = 'New Contact'
group by contact._id
order by "recency" desc, "frequency" desc
)
) contact_queue
order by priority desc, recency desc, callback_date asc, frequency desc
end
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May 10, 2007
I have two tables Encounter & Encounter_History. They have same columns. One column is of type CLOB. My requirement is to retrieve all the distinct records from both the tables with order by a date column. But problem is, UNION does not work in case of CLOB data type.
I know it will work if I use UNION ALL, but it returns duplicate records.
Please give me suggestion, how to solve this problem.
For example: The following query does not work since column1 is a CLOB data type
select column1 from table1
union
select column1 from table2
Thanks
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Nov 6, 2006
Hi all,
I have a Union All transformation with 4 inputs and one output when I debug the package the sum of the different inputs rows does not match the row count in output.
I don't understand, I've used the Union All transform many times and I've never seen this.
Any idea why this could happen ?
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Mar 29, 2004
I'm working on a softwear and I have to create some Update. This softwear used first MS Access as a database, and now I have to create the code which allows it to use MS SQL-server. This softwear is created in VB6.
I've got some error when I'm using the UNION ALL function. This error appears:
"incorrect syntax towards the key word ' union' "
Here is the code in VB6 :
" GOpenLocalDb (FOR_READ) ' open the database
SQLStmt = "select * from ol_table_temp"
SQLStmt = SQLStmt & " where [Subject_no] = " & dlr_subject & " "
ord$ = SQL_Order()
SQLStmt = SQLStmt & ord$
'dalafouzos: 24/09/2002 I added the lines below to include the DLR entries in the ol_old table
SQLStmt = SQLStmt & " union all select * from ol_table_old where [Subject_no] = " & dlr_subject & " "
ord$ = SQL_Order()
SQLStmt = SQLStmt & ord$
'GOpenLocalDb (FOR_READ) ' open the database
Set DLRset = New ADODB.Recordset
DLRset.CursorLocation = adUseClient
DLRset.Open SQLStmt, g_objConn, adOpenKeyset, adLockReadOnly, adCmdText "
when the error appears the value of SQLStmt is :
"select * from ol_table_temp where [Subject_no] = 1020 Order by [Date] DESC, [Time] DESC union all select * from ol_table_old where [Subject_no] = 1020 Order by [Date] DESC, [Time] DESC "
Thanks for your help...
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Jun 23, 2015
I have created a phone list and am using a union to be able to display letter category. However, what I would like to do is only show the letter category if their is an employee with the corresponding last name.
For example, if someone does not have a last name starting with "Z", then "Z" should not show up on my report.
SELECT LastName, FirstName, Dept, Phone
UNION ALL
SELECT v.letter,NULL,NULL,NULL,NULL
FROM (VALUES('A'),('B'),('C'),('D'),('E'),('F'),('G'),('H'),('I'),('J'),('K'),('L'),('M'),('N'),('O'),('P'),('Q'),('R'),('S'),('T'),('U'),('V'),('W'),('X'),('Y'),('Z')) AS v(letter)
ORDER BY vchLastName, vchFirstName
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Sep 21, 2006
Hi,I'm coming back to Sql Server after 4 years away, using other RDBMS,and there's a few things I'm struggling to remember how to do (if Icould do them in the first place...)Main amongst those is EXCEPT syntax.In DB2, if I have two sets of data and I want to exclude the second setfrom the first, I can do:SELECT col1, col2, col3, ... colNFROM table1EXCEPTSELECT col1, col2, col3, ... colNFROM table2;But SQL Server balks at this. I've had a quick look in the T-SQL helpfor EXCEPT, but I didn't find that particularly enlightening. Anypointers as to how I should be doing this?ThanksJames
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Apr 12, 2008
Hi-
I'm importing an Excel spreadsheet into SQL Server using the spreadsheet as a linked server. I've written the following query to do so:
Use TESTDB
go
SELECT * INTO VTAble FROM LINKSER...[DIST1$]
UNION ALL
SELECT * FROM LINKSER...[DIST2$]
UNION ALL
SELECT * FROM LINKSER...[DIST3$]
UNION ALL
SELECT * FROM LINKSER...[DIST4$]
UNION ALL
SELECT * FROM LINKSER...[DIST5$]
UNION ALL
SELECT * FROM LINKSER...[DIST6$]
UNION ALL
SELECT * FROM LINKSER...[DIST7$]
.... and it continues for 28 tables.
The spreadsheet tables are suposed to be identical, however I receive this error:
Msg 205, Level 16, State 1, Line 2
All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.
I'm guessing that in a couple places in the spreadsheet their is some variance in the data. I've experimented with running the query without SELECT statements for certain tables and have identified that there is something wrong with those tables. Is there a more systematic way I can locate the spreadsheet errors?
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Nov 29, 2006
Hi,
Is there a way I can get this select Union statement to work in Access.
SELECT '' AS Router UNION SELECT DISTINCT Router FROM IPVPNRouterUpgradeCharges WHERE SchemeID = 12 AND
Router <> 'IPVPN Lite' AND Router <> 'VPN Bridge'
AND Router <> 'IPVPN Aggregated Bandwidth' ORDER By Router
I get this message in Access: Query input must contain at least input of query
Thanks for any help
Chris
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Sep 9, 2014
I have TSQL query using UNION ALL. First subset returns 92 rows, second subset return 0 (ZERO) rows. Now if I execute them separately they execute subsecond. If I put UNION ALL between them then it hangs forever exactly on 88s row.
I understand I need to provide execution plans, actual queries etc but before going into all this details, why on earth even in theory UNION ALL with empty result will result in a hang of the first subset?
Based on estimated execution plan 2 subqueries are performed in parallel and then CONCATENTION is being used which shall result with just first subset immediately displayed in result.
Estimated execution plan attached, I can not get actual execution plan because query never completes.
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May 8, 2015
I have a performance issue with one of the views when I join the view with a temp table
I have 2 Views - View1 and View2.
There is a third view - view_UNION where the
view_UNION =
SELECT * FROM View1
UNION ALL
SELECT * FROM View2
If I have a query like -
Select view_UNION.* FROM
view_UNION INNER JOIN #TMP ON #TMP.ID = view_UNION.ID
the execution is too slow.
But if I execute the views separately, I get good performance.
How to improve the performance of the view_Union
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Jul 30, 2015
I have a query which wants to union join the data. no matter how many times I tried, I got an error. How to change my union query?
select distinct b.lev5 AS "LEVEL 1",b.lev5NAME, C.lev7 "FUND", C.lev7NAME,round (sum(a.data),2) AS AMOUNT
(Select distinct b.lev5
from bf_data a
inner join bf_orgn_cnsl_tbl b
on a.bf_orgn_cd = b.bf_orgn_cd
[Code] .....
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Aug 21, 2015
What I am trying to accomplish is to make a few extra columns with specified date ranges.
I have FY14 date range in the parameters at the top .. I would like to add a FY 15 column so the year would move up by 1.and also I need to add 2 more columns Prior year current month and This year, current month.
<code>
DECLARE @Fy14_start datetime
DECLARE @Fy14_end datetime
SET @Fy14_start = '2013-07-01'
SET @Fy14_end = '2014-06-30'
SELECT x.ACCOUNT_NAME, X.STATUS_CODE, COUNT(X.PATIENT_CODE) AS FY14
[code]....
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Jan 23, 2015
We have a table with 500+ columns. The data is non-normalized, i.e. there are four groups of fields for for "people", followed by data that applies to all people in the row (a "household").For ad-hoc queries, and because I wanted to index columns within each person (person 1's age, person 2's age, etc.), I used UNION:
SELECT P1Firstname AS FirstName, P1LastName as LastName, P1birthday AS birthday, HouseholdIncome, HouseholdNumber of Children, <other "household" columns>
UNION
SELECT P2Firstname AS FirstName, P2LastName as LastName, P2birthday AS birthday, HouseholdIncome, HouseholdNumber of Children, <other "household" columns>
I could get at least the P1... P2... P3... columns with PIVOT, but then I believe I'd have to JOIN back to the row anyway for the "household" columns. Performance of UNION good, but another person here chose to use PIVOT instead.I can' find any articles on PIVOT vs. UNION for "de-flattening".
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Jul 15, 2014
I am writing a stored procedure that takes in a customer number, a current (most recent) sales order quote, a prior (to most current) sales order quote, a current item 1, and a prior item 1, all of these parameters are required.Then I have current item 2, prior item 2, current item 3, prior item 3, which are optional.
I added an IF to check for the value of current item 2, prior item 2, current item 3, prior item 3, if there are values, then variable tables are created and filled with data, then are retrieved. As it is, my stored procedure returns 3 sets of data when current item 1, prior item 1, current item 2, prior item 2, current item 3, prior item 3 are passed to it, and only one if 2, and 3 are omitted.I would like to learn how can I return this as a one data set, either using a full outer join, or a union all?I am including a copy of my stored procedure as it is.
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Jan 23, 2001
Hi,
I am using DTS to import data where the query involves the UNION .
Select a,z,y from x
UNION
select b,z,y from y;
Only the columns Z,y appearing in the output. Is there any known problem with UNION in DTS?
Thanks
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Dec 3, 2004
Help me again . :) ..
Query :
Select 1 AS ColA, ColB,ColC
FROM Table1
Where ColA = 1
Union
Select 2 AS ColA, ColB,ColC
FROM Table1
Where ColA = 2
Expected Result.
ColA ColB ColC
1 Apple Sweet
1 Wine Alcohol
2 Home Nice
2 Travel Fun
But gives
ColA ColB ColC
1 Apple Sweet
1 Wine Alcohol
1 Home Nice
1 Travel Fun
any suggestions .please reply.
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Mar 23, 2007
Could someone explain me Union function in MDX? How is different from the T-SQL Union?
My need is urgent.
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Jul 12, 2004
i have a table with country names
table name:country
column name:country
it is populated with:
UK
USA
africa
asia
japan
i want a query which gives the foll output
USA
UK
africa
asia
japan
(i.e) USA and UK must be on the top 2 rows
while the rest of the countries should come below these 2 and sorted in the ascending order.
if it is possible with any other query also it is ok
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Jul 14, 2004
Hi
I just found out that I can do an ORDER BY clause on entire records set retrieve from a query that combines several sub queries with UNION from different tables with the same structure... so this is great to know, BTW, is this a new feature of MSSQL 2K ? I don't recall being able to do this in MSSQL 7 or 6.5.
Anyway, the main question is, can I use the TOP command in a query that has UNION in it?? Meaning, there are two queries (or more) from two tables (or more) and I need to fetch the top 10 records by an ORDER BY clause from the combined results, when I try to add each sub query TOP 10 the results are not correct at all, when I try to add TOP 10 only to the first query hoping that the analyzer will refer to the whole query, it's selecting TOP 10 from the first query and combines it with all the records from the others...
So, can anyone help? I hope the problem is understood.
Thank you,
Inon.
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Nov 8, 2004
Hi!
I am trying to join to different queries into one table ( I accomplished this)
Next I need to ADD or SUM the results of 2 rows to form a single row.
As you can see in the query below, I run 2 separate queries and use ' ' as a place holder for the UNION to work. I get duplicate rows, one with a value and the other with a '0'. I want to have a single row.
Any help is greatly appreciated!
(SELECT
v_gs_supportedpackages.ProdID0 as 'Product Name',
v_RA_System_SMSInstalledSites.SMS_Installed_Sites0 as 'Site',
Count(ProdID0) as '# copies installed',
'' as '# legitimate copies installed'
FROM
v_R_System SYS,
v_GS_Workstation_Status HWSCAN,
v_gs_SupportedPackages
inner join
v_RA_System_SMSInstalledSites on v_RA_System_SMSInstalledSites.ResourceID = v_gs_SupportedPackages.ResourceID
WHERE
SYS.ResourceId = HWSCAN.ResourceId
AND
SYS.ResourceId = v_gs_SupportedPackages.ResourceId
AND
v_gs_supportedpackages.ProdID0 = substring('MS Security Patch MS04-030,031,032,034,037,038',1,60)
GROUP BY
v_gs_supportedpackages.ProdID0,
v_RA_System_SMSInstalledSites.SMS_Installed_Sites0 )
UNION
(SELECT
v_gs_supportedpackages.ProdID0 as 'Product Name',
v_RA_System_SMSInstalledSites.SMS_Installed_Sites0 as 'Site',
'' as '# copies installed',
Count(ProdID0) as '# legitimate copies installed'
FROM
v_R_System SYS,
v_GS_Workstation_Status HWSCAN,
v_gs_SupportedPackages
inner join
v_RA_System_SMSInstalledSites on v_RA_System_SMSInstalledSites.ResourceID = v_gs_SupportedPackages.ResourceID
WHERE
SYS.ResourceId = HWSCAN.ResourceId
AND
SYS.ResourceId = v_gs_SupportedPackages.ResourceId
AND
v_gs_supportedpackages.ProdID0 = substring('MS Security Patch MS04-030,031,032,034,037,038',1,60)
AND
DateDiff(Day,HWSCAN.LastHWScan,GetDate()) <= '20'
GROUP BY
v_gs_supportedpackages.ProdID0,
v_RA_System_SMSInstalledSites.SMS_Installed_Sites0 )
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Dec 15, 2006
Just a pet peeve....
From BOL:
By default, the UNION operator removes duplicate rows from the result set.
If you use ALL, all rows are included in the results and duplicates are not
removed.
Why is it assumed that one would want the duplicates removed by default?
Isn't that what SELECT DISINCT is for?
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Mar 18, 2004
I was wondering if there is a way I could write this query as one query using union instead of 3 different queries?
SELECT columna as column,count(ID) as Applications
FROM tablea
GROUP columna
SELECT columna as column2, count(ID) as Approved
FROM tablesa where substring(APP_DATE,1,6) >'200304' and in 'Approved')
GROUP BY columna
SELECT columna as column3, count(ID) as Booked, sum(AMT) as amt, sum(AMT)/count(ID) as lavg
from tablea where substring(APP_DATE,1,6) >'200304' and STATUS in('book')
group by columna
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Apr 22, 2008
Hi All,
I am doing a UNION of 8 views(with 3 million rows in each view approx). I am sure that there is NO DUPLICATE data between the views. SO specifying a UNION ALL would be better than specifying a UNION in this case?
Thanks!
Prakash.P
The secret to creativity is knowing how to hide your sources!
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Jun 20, 2008
Hi folks,
I have a question about the performance of the following query:
(SELECT name, lastName
from Data
where salary >= 2200
)
union
(SELECT name, lastName
from Data
where salary >= 2200
) union
(SELECT name, lastName
from Data
where salary >= 2200
)
How that query works? Is it slow for a larger data? Does it do 3 queries and then combine them?
Thank you.
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Feb 11, 2008
Hi All
I want to do the following report and I want the 2nd select statement to appear at the bottom to display the totals
SELECT Item,B.Mar, B.Apr, B.May, B.Jun,B.Jul, B.Aug, B.Sep, B.Oct, B.Nov, B.Dec, B.Jan
FROM fncWineSales(2007) AS A
UNION
SELECT 'Total',SUM(B.Mar), SUM(B.Apr), SUM(B.May), SUM(B.Jun),SUM(B.Jul), SUM(B.Aug), SUM(B.Sep), SUM(B.Oct), SUM(B.Nov), SUM(B.Dec), SUM(B.Jan)
FROM dbo.fncWineSales (2007) AS B
thanx in advance
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Jul 23, 2005
Hello,Bear with me (not had much sleep last night), pls see following ddl,dml and comments for what is desired, I don't have a problem gettingdesired result(s), however, I'm wondering if there's another (better)solution than UNION operator in this case. TIA.-- DDLCREATE TABLE #TMP (col varchar(10));-- DMLinsert into #TMPvalues('A124');insert into #TMPvalues('A127');insert into #TMPvalues('A12728');insert into #TMPvalues('A17282');insert into #TMPvalues('BCD');insert into #TMPvalues('BCD');insert into #TMPvalues('CDSS');insert into #TMPvalues('DS');insert into #TMPvalues('YUUEI');-- goal: get one row with col data starting with 'A' and distict rowsfor the restselect top 1 colfrom #TMPwhere col LIKE 'A%'UNIONselect distinct colfrom #TMPwhere col NOT LIKE 'A%'
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Jul 20, 2005
Hi,I can return results of a union easily enough, but I wish to sum the recordsfirst. Is this possible in a single SQL statement? Or do I have to useseparate ones to sum up after the union?Cheers,Chris
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