hi all,
i am not sure what would be more optimum for speed, i was wondering if one is better than the other.
i have 3 count queries that i can write as
SELECT COUNT(a) FROM ....
SELECT COUNT(b) FROM ....
SELECT COUNT(c) FROM ....
or i can have them in UNION ALL....
which would be faster three seperate queries or one UNION ALL query, any help?
thanks
Aleks
In v. 7 I could create union queries and save them as views, which I found very usefull for feeding data to reporting apps etc. In SQL 2000 the view builder balks at this. (The message states "View definition includes no output columns or includes no items in the from clause.") Version 7 used to complain as well but would still save the view (it's just a text SQL statement, after all). Is it still possible to save a union query as a view in SQL 2000? The view I was trying to create this morning is:
SELECT idx, slots_idx, partno, priority
FROM table 1
UNION ALL
SELECT idx, slots_idx, partno, priority
FROM table 2
Three sql statements whose result has to be unioned
SELECT
orders_recipients as Email
FROM vendors
where
vendorID in
(select Vendorid from Restaurants_VendorsAssoc where restaurantid = @resid)
union
SELECT str_eMail as EMail from tbl_contactmanager where (bit_shared =1) and int_restaurantId in (select restaurantid from users where userID in (select UserID2 from Users_Linked where UserID1 = @userid))
union
SELECT str_eMail as EMail from tbl_contactmanager where int_restaurantId = @resid
I am getting an error message as follows
The text, ntext, or image data type cannot be selected as DISTINCT.
pls help
why this code wont work? Attempting to join Home Games and Away games data from two queries.
SELECTSoccer_Base.dbo.Teams.TeamName
,Sum(Games) as games
(
SELECTSoccer_Base.dbo.Results.HomeTeam as Team
,COUNT(Soccer_Base.dbo.Results.HomeTeam) as [Games]
,SUM(Case WHEN Soccer_Base.dbo.Results.HomeFT> Soccer_Base.dbo.Results.AwayFT THEN 1 ELSE 0 END) AS [Win]
,SUM(Case WHEN Soccer_Base.dbo.Results.HomeFT= Soccer_Base.dbo.Results.AwayFT THEN 1 ELSE 0 END) AS [Draw]
[code]....
Hi I have the following union query that retrieves two counts. Can Isum them up within this query, like wrap this in a sum functionsomehow to get the total count? Or is there a better way to do this.Please help. Using SQL 2000.select count(user_id) from table1UNIONselect count(user_id) from table2
View 2 Replies View RelatedI have a question regarding the use of CTEs.
The query I'm working on involves a UNION of four or five smaller queries, each doing different things. Each query, however, uses the same base set of records. eg:
SELECT ...
FROM Products p
JOIN ... -- many other tables
WHERE p.ProductIsActive = 1
UNION
SELECT ...
FROM Products p
JOIN ... -- a different set of tables
WHERE p.ProductIsActive = 1
UNION ... -- etc etc
So each subquery is working from the same base set of Products rows.
My idea was to pull that out into a CTE. Something like this:
WITH ActiveProducts AS (
SELECT ProductID
FROM Products
WHERE ProductIsActive = 1
)
SELECT ...
FROM ActiveProducts p
JOIN ... -- many other tables
UNION
SELECT ...
FROM ActiveProducts p
JOIN ... -- a different set of tables
UNION ... -- etc etc
So my question is: If I do it this way, will the "ActiveProducts" CTE get executed for every subquery? Or will it just get executed once and used like a view by each subquery?
Or is there a better way to do this that I'm overlooking?
Thanks!
I've run into some trouble with an apparently simple UNION query:
SELECT [Date] AS D, C7, NULL AS L72A, NULL AS P02, PAV
FROM [Process Variables Level 1]
UNION
SELECT [Date] as D, NULL AS C7, L72A, P02, NULL AS PAV
FROM [Process Variables Level 2]
ORDER BY D
Records in the 2 tables may or may not have the same Date/Time values.
The product of the above UNION query appears to be using dates from the [Process Variables Level 2] table only. I'm getting values returned for field C7 with Date/Time values from table [Process Variables Level 2]??
Any suggestions would be welcome!!
I following two queries
First query is
SELECT HomeTeam, 1 AS Pld, CASE WHEN HomeScore > AwayScore THEN 1 ELSE 0 END AS Won, CASE WHEN HomeScore = AwayScore THEN 1 ELSE 0 END AS Draw, CASE WHEN HomeScore < AwayScore THEN 1 ELSE 0 END AS Lost, HomeScore AS Scored, AwayScore AS Against, HomeScore - AwayScore AS Agg, CASE WHEN HomeScore > AwayScore THEN 3 ELSE 0 END AS Pts FROM tblFixtures WHERE (CompID = 1) AND (HomeScore IS NOT NULL)
and second query is
SELECT AwayTeam, 1 AS Pld, CASE WHEN HomeScore < AwayScore THEN 1 ELSE 0 END AS Won, CASE WHEN HomeScore = AwayScore THEN 1 ELSE 0 END AS Draw, CASE WHEN HomeScore > AwayScore THEN 1 ELSE 0 END AS Lost, AwayScore AS Scored, HomeScore AS Against, AwayScore - HomeScore AS Agg, CASE WHEN HomeScore < AwayScore THEN 3 WHEN HomeScore = AwayScore THEN 1 ELSE 0 END AS Pts FROM tblFixtures WHERE (CompID = 1) AND (HomeScore IS NOT NULL)
what i need is
I want to create another joint result of two queries which adds up all the totals from each of the other two queries.
Result some thing like
Team, Pld, W, D, L, F, A, Agg, Pts
Kamran Shahid
Sr. Software Engineer(MCSD.Net)
www.netprosys.com
Hi,I'm trying to get the count of rows from the union of several tables.My code is:select count(*) from (select * from #AdvSearch_Mainunionselect * from #AdvSearch_Atty)This will not get past the syntax check saying that the error occurs onthe final closing ")".Can someone tell me how to correctly write this?Thanks,Glen--------------------------Numbers 6:24-26----------------------------------------------------Numbers 6:24-26--------------------------*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
View 1 Replies View RelatedHi,Should be quite simple but can someone please tell me the best way tocount the number of rows in an UNION ALL statement.I tried using @@ROWCOUNT but that doesn't seem to contain the correctnumber.Also, I assume that running the query again but just returning count(*)instead of the data is horribly inefficient (plus the code is thenbloated.)?Thanks,Mark
View 1 Replies View RelatedHi,
I'm having problems manipulating the results from multiple count(*) queries.
I have a table 'RECOMMENDATIONS' holding a field called 'SCORE'. This field holds a number from 1 to 10 and has no null or zero figures.
I currently have the following three queries:
1) SELECT COUNT(*) FROM RECOMMENDATIONS WHERE SCORE IN (1,2,3,4,5,6)
2) SELECT COUNT(*) FROM RECOMMENDATIONS WHERE SCORE IN (9,10)
3) SELECT COUNT(*) FROM RECOMMENDATIONS
I now need to combine these three queries so that i can divide and multiply the resulst: (query 2/query 1)*query 3
My initial idea was:
SELECT (COUNT(*)/(SELECT COUNT(*) FROM RECOMMENDATIONS WHERE SCORE IN (1,2,3,4,5,6)))* (SELECT COUNT(*) FROM RECOMMENDATIONS) FROM RECOMMENDATIONS WHERE SCORE IN (9,10)
... but this gives a result of "0". I then stripped out the multiplication section to see if the divide was working:
SELECT COUNT(*)/(SELECT COUNT(*) FROM RECOMMENDATIONS WHERE SCORE IN (1,2,3,4,5,6)) FROM RECOMMENDATIONS WHERE SCORE IN (9,10)
... and again the result was "0"
Please could someone help me!!
Ian
I have a requirement to calculate the % change in the number of orders received today with the number of orders that were received 3 days back. All data is in the same table. There is a received date column.
I have two count(*) queries - one for today and one for 3 days back running separately and getting the results. Is it possible I can get the % change in orders received from 3 days back and today in one query.Also if I want to get the number of orders received today between 12:00am today and current time. How would I modify the query.
I have a quite big SQL query which would be nice to be used using UNION betweern two Select and Where clauses. I noticed that if both Select clauses have Where part between UNION other is ignored. How can I prevent this?
I found a article in StackOverflow saying that if UNION has e.g. two Selects with Where conditions other one will not work. [URL] ....
I have installed SQL Server 2014 and I tried to use tricks mentioned in StackOverflow's article but couldn't succeeded.
Any example how to write two Selects with own Where clauses and those Selects are joined with UNION?
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] .....
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
With the function below, I receive this error:Error:Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 1, current count = 0.Function:Public Shared Function DeleteMesssages(ByVal UserID As String, ByVal MessageIDs As List(Of String)) As Boolean Dim bSuccess As Boolean Dim MyConnection As SqlConnection = GetConnection() Dim cmd As New SqlCommand("", MyConnection) Dim i As Integer Dim fBeginTransCalled As Boolean = False
'messagetype 1 =internal messages Try ' ' Start transaction ' MyConnection.Open() cmd.CommandText = "BEGIN TRANSACTION" cmd.ExecuteNonQuery() fBeginTransCalled = True Dim obj As Object For i = 0 To MessageIDs.Count - 1 bSuccess = False 'delete userid-message reference cmd.CommandText = "DELETE FROM tblUsersAndMessages WHERE MessageID=@MessageID AND UserID=@UserID" cmd.Parameters.Add(New SqlParameter("@UserID", UserID)) cmd.Parameters.Add(New SqlParameter("@MessageID", MessageIDs(i).ToString)) cmd.ExecuteNonQuery() 'then delete the message itself if no other user has a reference cmd.CommandText = "SELECT COUNT(*) FROM tblUsersAndMessages WHERE MessageID=@MessageID1" cmd.Parameters.Add(New SqlParameter("@MessageID1", MessageIDs(i).ToString)) obj = cmd.ExecuteScalar If ((Not (obj) Is Nothing) _ AndAlso ((TypeOf (obj) Is Integer) _ AndAlso (CType(obj, Integer) > 0))) Then 'more references exist so do not delete message Else 'this is the only reference to the message so delete it permanently cmd.CommandText = "DELETE FROM tblMessages WHERE MessageID=@MessageID2" cmd.Parameters.Add(New SqlParameter("@MessageID2", MessageIDs(i).ToString)) cmd.ExecuteNonQuery() End If Next i
' ' End transaction ' cmd.CommandText = "COMMIT TRANSACTION" cmd.ExecuteNonQuery() bSuccess = True fBeginTransCalled = False Catch ex As Exception 'LOG ERROR GlobalFunctions.ReportError("MessageDAL:DeleteMessages", ex.Message) Finally If fBeginTransCalled Then Try cmd = New SqlCommand("ROLLBACK TRANSACTION", MyConnection) cmd.ExecuteNonQuery() Catch e As System.Exception End Try End If MyConnection.Close() End Try Return bSuccess End Function
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 ?
below data,
Countery
parentid
CustomerSkId
sales
A
29097
29097
10
A
29465
29465
30
A
30492
30492
40
[code]....
Â
Output
Countery
parentCount
A
8
B
3
c
3
in my count function,my code look like,
 set buyerset as exists(dimcustomer.leval02.allmembers,custoertypeisRetailers,"Sales")
set saleset(buyerset)
set custdimensionfilter as {custdimensionmemb1,custdimensionmemb2,custdimensionmemb3,custdimensionmemb4}
set finalset as exists(salest,custdimensionfilter,"Sales")
Set ProdIP as dimproduct.dimproduct.prod1
set Othersset as (cyears,ProdIP)
(exists(([FINALSET],Othersset,dimension2.dimension2.item3),[DimCustomerBuyer].[ParentPostalCode].currentmember, "factsales")).count
it will take 12 to 15 min to execute.
I am trying to get count on a varchar field, but it is not giving me distinct count. How can I do that? This is what I have....
Select Distinct
sum(isnull(cast([Total Count] as float),0))
from T_Status_Report
where Type = 'LastMonth' and OrderVal = '1'
I use SQL 2000
I have a Column named Bool , the value in this Column is 0�0�1�1�1
I no I can use Count() to count this column ,the result would be "5"
but what I need is "2" and "3" and then I will show "2" and "3" in my DataGrid
as the True is 2 and False is 3
the Query will have some limited by a Where Query.. but first i need to know .. how to have 2 result count
could it be done by Count()? please help.
thank you very much
SQL 2000I have a table with 5,100,000 rows.The table has three indices.The PK is a clustered index and has 5,000,000 rows - no otherconstraints.The second index has a unique constraint and has 4,950,000 rows.The third index has no constraints and has 4,950,000 rows.Why the row count difference ?Thanks,Me.
View 5 Replies View RelatedThe following query returns a value of 0 for the unit percent when I do a count/subquery count. Is there a way to get the percent count using a subquery? Another section of the query using the sum() works.
Here is a test code snippet:
--Test Count/Count subquery
declare @Date datetime
set @date = '8/15/2007'
select
-- count returns unit data
Count(substring(m.PTNumber,3,3)) as PTCnt,
-- count returns total for all units
(select Count(substring(m1.PTNumber,3,3))
from tblVGD1_Master m1
left join tblVGD1_ClassIII v1 on m1.SlotNum_ID = v1.SlotNum_ID
Where left(m1.PTNumber,2) = 'PT' and m1.Denom_ID <> 9
and v1.Act = 1 and m1.Active = 1 and v1.MnyPlyd <> 0
and not (v1.MnyPlyd = v1.MnyWon and v1.ActWin = 0)
and v1.[Date] between DateAdd(dd,-90,@Date) and @Date) as TotalCnt,
-- attempting to calculate the percent by PTCnt/TotalCnt returns 0
(Count(substring(m.PTNumber,3,3)) /
(select Count(substring(m1.PTNumber,3,3))
from tblVGD1_Master m1
left join tblVGD1_ClassIII v1 on m1.SlotNum_ID = v1.SlotNum_ID
Where left(m1.PTNumber,2) = 'PT' and m1.Denom_ID <> 9
and v1.Act = 1 and m1.Active = 1 and v1.MnyPlyd <> 0
and not (v1.MnyPlyd = v1.MnyWon and v1.ActWin = 0)
and v1.[Date] between DateAdd(dd,-90,@Date) and @Date)) as AUPct
-- main select
from tblVGD1_Master m
left join tblVGD1_ClassIII v on m.SlotNum_ID = v.SlotNum_ID
Where left(m.PTNumber,2) = 'PT' and m.Denom_ID <> 9
and v.Act = 1 and m.Active = 1 and v.MnyPlyd <> 0
and not (v.MnyPlyd = v.MnyWon and v.ActWin = 0)
and v.[Date] between DateAdd(dd,-90,@Date) and @Date
group by substring(m.PTNumber, 3,3)
order by AUPct Desc
Thanks. Dan
HelloWhen I use a PreparedStatement (in jdbc) with the following query:SELECT store_groups_idFROM store_groupsWHERE store_groups_id IS NOT NULLAND type = ?ORDER BY group_nameIt takes a significantly longer time to run (the time it takes forexecuteQuery() to return ) than if I useSELECT store_groups_idFROM store_groupsWHERE store_groups_id IS NOT NULLAND type = 'M'ORDER BY group_nameAfter tracing the problem down, it appears that this is not preciselya java issue, but rather has to do with the underlying cost of runningparameterized queries.When I open up MS Enterprise Manager and type the same query in - italso takes far longer for the parameterized query to run when I usethe version of the query with bind (?) parameters.This only happens when the table in question is large - I am seeingthis behaviour for a table with > 1,000,000 records. It doesn't makesense to me why a parameterized query would run SLOWER than acompletely ad-hoc query when it is supposed to be more efficient.Furthermore, if one were to say that the reason for this behaviour isthat the query is first getting compliled and then the parameters aregetting sent over - thus resulting in a longer percieved executiontime - I would respond that if this were the case then A) it shouldn'tbe any different if it were run against a large or small table B) thisperformance hit should only be experienced the first time that thequery is run C) the performance hit should only be 2x the time for thenon-parameterized query takes to run - the difference in response timeis more like 4-10 times the time it takes for the non parameterizedversion to run!!!Is this a sql-server specific problem or something that would pertainto other databases as well? I there something about the coorect use ofbind parameters that I overall don't understand?If I can provide some hints in Java then this would be great..otherwise, do I need to turn/off certain settings on the databaseitself?If nothing else works, I will have to either find or write a wrapperaround the Statement object that acts like a prepared statement but inreality sends regular Statement objects to the JDBC driver. I wouldthen put some inteligence in the database layer for deciding whetherto use this special -hack- object or a regular prepared statementdepending on the expected overhead. (Obviously this logic would onlybe written in once place.. etc.. IoC.. ) HOWEVER, I would desperatelywant to avoid doing this.Please help :)
View 1 Replies View RelatedHi all
i using lookup error output to insert rows into table
Rows count rows has been inserted on the table 59,123,019 mill
table rows count 6,878,110 mill ............................
any ideas
Is there a difference in performance when using count(*) or count(columnname)?
View 10 Replies View RelatedHi,
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
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.
Could someone explain me Union function in MDX? How is different from the T-SQL Union?
My need is urgent.
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
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.
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 )
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?
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