Nested Loop Join
Jan 26, 2006
Hi,
I have came across a situation -
When there are no indices on the tables and if we force SQL server to use the "Nested Loop" joins, the query becomes very slow. Since there are no indices then Nested loop join should not be used.
The background for this problem is -
Analysis services is sending some query to SQL server while doing the cube processing. SQL server is using Nested loop joins even though there are no indices on any of the tables. Is there any way by which we can force the SQL server/Analysis services not to use Nested loop joins since there are no indices in any of the tables.
regards,
datta.
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Mar 31, 2006
i'm running the following code on Ms SQL Server 2000, Query Analyzer to analyze the result of Nested Loop Join.
SET STATISTICS PROFILE ON
GO
SELECT pdN.ProductID, pdN.ProductName,
spN.CompanyName, spN.ContactName
FROM dbo.ProductsNew pdN
INNER JOIN dbo.SuppliersNew spN
ON pdN.SupplierId = spN.SupplierId
GO
but the execution plan give me the following result :-
http://i31.photobucket.com/albums/c366/i3lu3fun/executionplan.jpg
instead of using nested, why does it using hash join? is there anything wrong with my code?
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Dec 10, 2004
Hi there. I want to avoid a cursur using a quite basing nested while loop. The problem is, that the outer index-variable (i) won't increment at all while the inner loop works perfectly.
This one should be quite easy to solve I guess, I'd be very happy if someone could give me a hint what I should try, though because I don't know what to try. The manual didn't help me much either, using CONTINUE and BREAKs didn't solve this problem for me.
My code:
DECLARE @i INTEGER
DECLARE @j INTEGER
SET @i = 1
SET @j = 0
WHILE(@i<= 10) BEGIN
WHILE(@j <= 100) BEGIN
SELECT @i, @j, COUNT(*) as anz FROM mytable WHERE dim1 = @i AND dim2 = @j
SET @j = @j + 1
END
SET @i = @i + 1
END
Thanks a lot for your help :)
Bernhard
corrected typo...
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Jul 30, 2007
I want to know how to create a recursive loop/function in SQL, I can’t seem to figure out how to do it.
The database table I am working with is simply the following:
SeedID, ThisParentSeedID
1, 0
2, 1
3, 1
4, 2
5, 4
6, 5
7, 6
8, 7
9, 7
10, 7
11, 10
12, 0
13, 0
14, 0
The example table above shows that SeedID 1 = the parent level of the data. SeedID 2 and 3 are children of SeedID 1, 4 is child of 2, 5 is child of 4... 12 13 and 14 are also parent levels (they are not children of anything).
I want to know how to create a SQL script that is “object oriented� in that I will not have to create as many levels of nested scripts as there are nested “children� in the data.
What I am wanting to figure out is, with a single script, “which sub-children are assigned to [@SeedID]�? So if this script was called, and @SeedID = 1, it would return (2,3,4,5,6,7,8,9,10,11). If @SeedID = 12, it would return null. If @SeedID = 7, it would return (8,9,10,11)
I have tried to keep my question and data as simple as possible for the sake of getting some feedback or help. If you want me to clarify or explain better, please ask me to!
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Nov 1, 2005
Hi,I'm probably missing something obvious (either that or doing this totally wrong).I'm trying to use a nested loop to generate the following results:Unit Day1 Day2 Day3 Day4 Day5Name1 25 45 89 54 76Name2 48 54 81 74 98What I have so far is this:WHILE @FCount < @TotalFoodUnitsBEGINSELECT (SELECT Unit FROM tbl_acc_FoodVenues WHERE UnitID = (@FCount + 1)) AS Unit WHILE @FDCount < @Days BEGIN SELECT (SELECT FdRevenue_a FROM tbl_acc_aud_SportsAudits WHERE AudDate = DATEADD(day, @FDCount, @pdStartDate)) AS Rev SET @FDCount = @FDCount + 1 END SET @FCount = @FCount + 1ENDAny suggestions please
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Jan 26, 2006
Hi,
I have came across a situation -
When there are no indices on the tables and if we force SQL server to use the "Nested Loop" joins, the query becomes very slow. Since there are no indices then Nested loop join should not be used.
The background for this problem is -
Analysis services is sending some query to SQL server while doing the cube processing. SQL server is using Nested loop joins even though there are no indices on any of the tables. Is there any way by which we can force the SQL server/Analysis services not to use Nested loop joins since there are no indices in any of the tables.
regards,
datta.
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May 25, 2007
Dear All,
I need to create a query to list all the subfolders within a folder.
I have a database table that lists the usual properties of each of the folder.
I have another database table that has two columns
1. Parent folder
2. Child folder
But this table maintains the parent child relationship only to one level.
For example if i have a folder X that has a subfolder Y and Z.
And Y has subfolders A and B.
and B has subfolder C and D
and C has subfolder E and F
The database table will look like
parentfolder child folder
X Y
X Z
Y A
Y B
B C
B D
C E
C F
I want to write a query which will take a folder name as the input and will provide me a list of all the folders and subfolders under it. The query should be based on the table (parent - child) and there should not be any restriction on the subfolder levels to search and report for.
I have been banging my head to do this but i have failed so far. Any help on this will be highly appreciated.
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Jul 20, 2005
Im getting way too many rows retured..what its trying to do is inserta 0 for revenue for months 7 - 12 (aka July through December) for eachof these cost centers for each payor type..Im getting a lot of repeatsand the concatenation field date always comes back as January 2003instead of the month and date its supposed to--Fiscal Yeardeclare @year smallintset @year = 2004--Month number the Fiscal year starts and endsdeclare @month smallintset @month = 7--Place holder for number of costcentersdeclare @cccounter smallint--loop counter for cost centersdeclare @ccount smallintset @ccount = 1--Place holder for number of payor typesdeclare @ptcounter smallint--loop counter for payor typesdeclare @pcount smallintset @pcount = 1--Temp table to store the blank values for all cost centers/payortypes for the fiscal yeardeclare @Recorded_Revenue_tmp table(Revenue money default 0,[Date] varchar(15),monthn smallint,yearn smallint,[CostCenter] varchar(50),[PayorType] varchar(50))--Temp table to store the values of the cost centersdeclare @costcenter_tmp table(ccid int IDENTITY (1,1),ccname varchar(50))--Inserts cost centers and code into the @costcenter_tmp temp tableinsert into @costcenter_tmp (ccname) select costcenter.fullname + ' '+ costcenter.code from costcenter, agency_cost_centerwhere costcenter.oid = agency_cost_center.cost_center_moniker--Sets the @cccounter variable to the number of cost centersselect @cccounter = count(*) from @costcenter_tmp--Temp table to store the values of the payor typesdeclare @payor_type_tmp table(ptid int identity (1,1),ptname varchar(50))--Inserts payor types into the @payor_type_tmp temp tableInsert into @payor_type_tmp(ptname)select fullname from payor_type,payorwhere payor_type.oid = payor.payor_type_moniker--Sets the @ptcounter variable to the number of payor typesselect @ptcounter = count(*) from @payor_type_tmp--Loop that gets the first part of the fiscal yearWhile (@month <13)begin--Loop that gets the value of the cost center to insertWhile (@ccount <= @cccounter)begin--Loop that inserts values for the first part of the fiscal year intothe @Recorded_Revenue_tmp temp tablewhile (@pcount <= @ptcounter)beginInsert into @Recorded_Revenue_tmp(Revenue, [Date], monthn,yearn,[CostCenter],[PayorType])select 0, datename(month, @month)+ ' ' + cast(@year -1 as varchar(4)),@month, @year -1, ccname, ptnamefrom @costcenter_tmp ct,@payor_type_tmp pt where ct.ccid = @ccount andpt.ptid = @pcountset @pcount = @pcount + 1endset @pcount = 1set @ccount = @ccount + 1endset @ccount = 1set @month = @month + 1endselect * from @Recorded_Revenue_tmpsample return data:(returns 16008 rows!!!)..0000January 200372003Genesis Assertive Community Treatment Team250SAGA..0000January 200372003Genesis Assertive Community Treatment Team250Self Pay..0000January 200372003Genesis Assertive Community Treatment Team250ABH..0000January 200372003Genesis Assertive Community Treatment Team250Managed Medicaid..0000January 200372003Genesis Assertive Community Treatment Team250Managed Medicaid..0000January 200372003Genesis Assertive Community Treatment Team250Managed Medicaid..0000January 200372003Genesis Assertive Community Treatment Team250Managed Medicaid..0000January 200372003Genesis Assertive Community Treatment Team250Commercial..0000January 200372003Genesis Assertive Community Treatment Team250Commercial..0000January 200372003Genesis Assertive Community Treatment Team250Commercial..0000January 200372003Genesis Assertive Community Treatment Team250Commercialthanks -Jim
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Jul 20, 2005
I have to automate a process that assigns sales leads to sales people.For example:Every day we buy a list of sales leads, it ranges in size from 50 -100 records.We have a team of sales people that also can range from 5 - 8 people.I need to take the new records and divide them evenly among the salespeople.If i get 50 records, and have 5 sales people, then each sales persongets 10 leads.--So, im guessing that I may need to have a nested loop inside this. Ihave tried it several different ways, but cant seem to get it quiteright.DECLARE @TotalRecordCount int, @TotalSalesPeopleCount int,@AmountForEach int, @LooperSalesPeoplerecords int,@LooperNewSalesLeadsRecords int, @SalesPersonID intSELECT @TotalSalesPeopleCount = COUNT(UserId)FROM SalesPeopleWHERE Active = 1--SELECT @TotalRecordCount = COUNT(*)FROM NewSalesLeads--SELECT @AmountForEach = (@TotalRecordCount/@TotalSalesPeopleCount)--SELECT @LooperSalesPeoplerecords = 1SELECT @LooperNewSalesLeadsRecords = 1--WHILE @LooperSalesPeoplerecords <= @TotalSalesPeopleCountBEGINWHILE @LooperNewSalesLeadsRecords <= @TotalRecordCountBEGINSELECT @SalesPersonID = (SELECT UserIDFROM SalesPeopleWHERE UniqueId = @LooperSalesPeoplerecords)SELECT @LooperSalesPeoplerecords =(@LooperSalesPeoplerecords + 1)UPDATE SalesLeadsSET SalesPerson_ID = @SalesPersonIDWHERE UNIQUEID = @LooperSalesPeoplerecordsSELECT @LooperSalesPeoplerecords =(@LooperSalesPeoplerecords + 1)ENDEND----Table structuresCREATE TABLE [dbo].[SalesPeople] ([SalesPerson_ID] [int] NOT NULL ,[FirstName] [varchar](20)NOT NULL) ON [PRIMARY]--INSERT INTO SalesPeople (SalesPerson_ID,FirstName) VALUES (26, 'Bill')INSERT INTO SalesPeople (SalesPerson_ID,FirstName) VALUES (28, 'Bob')INSERT INTO SalesPeople (SalesPerson_ID,FirstName) VALUES (37,'Chris')------------------------------------------------CREATE TABLE [dbo].[SalesLeads] ([SalesLeadID] [int]NOT NULL ,[SalesPerson_ID] [int]NOT NULL) ON [PRIMARY]--INSERT INTO SalesLeads (SalesLeadID,SalesPerson_ID) VALUES (1001,0)INSERT INTO SalesLeads (SalesLeadID,SalesPerson_ID) VALUES (1002,0)INSERT INTO SalesLeads (SalesLeadID,SalesPerson_ID) VALUES (1003,0)INSERT INTO SalesLeads (SalesLeadID,SalesPerson_ID) VALUES (1004,0)INSERT INTO SalesLeads (SalesLeadID,SalesPerson_ID) VALUES (1005,0)INSERT INTO SalesLeads (SalesLeadID,SalesPerson_ID) VALUES (1006,0)------------------------------------------------So in this case, all 3 salespeople should receive 2 salesleads each.I dummied this down quite a bit. It actually ends up being more like15 sales people, and about 400,000 sales leads. But it should work onany level.Thanks for any help you might shed on this.
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Jul 20, 2005
I am trying to write a utility/query to get a report from a table. Belowis the some values in the table:table name: dba_daily_resource_usage_v1conn|loginame|dbname|cum_cpu|cum_io|cum_mem|last_b atch------------------------------------------------------------80 |farmds_w|Farm_R|4311 |88 |5305 |11/15/2004 11:3080 |abcdes_w|efgh_R|5000 |88 |4000 |11/15/2004 12:3045 |dcp_webu|DCP |5967 |75 |669 |11/16/2004 11:3095 |dcp_webu|XYZ |5967 |75 |669 |11/17/2004 11:30I need to write a query which for a given date (say 11/15/2004),generate a resource usage report for a given duration (say 3 days).Here is my query:************************************set quoted_identifier offdeclare @var1 intset @var1=0--BEGIN OUTER LOOPwhile @var1<=3 --INPUT runs the report for 3 daysbegindeclare @vstartdate char (10) --INPUT starting dateset @vstartdate='11/15/2004'--builds a range of datedeclare @var2 datetimeset @var2=(select distinct (dateadd(day,@var1,convert(varchar(10),last_batch,101)))--set @var2=(select distinct (dateadd(day,@var1,last_batch))from dba_daily_resource_usage_v1where convert(varchar (10),last_batch,101)=@vstartdate)set @var1=@var1+1 --increments a daydeclare @var5 varchar (12)--set dateformat mdy--converts the date into 11/15/2004 format from @var2set @var5="'"+(convert(varchar(10),@var2,101))+"'"--print @var5 produces '11/15/2004' as resultdeclare @vloginame varchar (50)declare @vdbname varchar (50)--BEGIN INNER LOOPdeclare cur1 cursor read_only forselect distinct loginame,dbname fromdba_daily_resource_usage_v1where convert(varchar (10),last_batch,101)=@var5--??????PROBLEM AREA ABOVE STATEMENT??????--print @var5 produces '11/15/2004' as result--however cursor is not being built and hence it exits the--inner loop (cursor)open cur1fetch next from cur1 into @vloginame, @vdbnamewhile @@fetch_status=0begin--print @var5 produces '11/15/2004' as resultdeclare @vl varchar (50)set @vl="'"+rtrim(@vloginame)+"'"declare @vd varchar (50)set @vd="'"+@vdbname+"'"--processes the cursorsdeclare @scr varchar (200)set @scr=("select max(cum_cpu) from dba_daily_resource_usage_v1 whereloginame="+@vl+" and dbname="+@vd+" and "+"convert(varchar(10),last_batch,101)="+@var5)--set @var3 =(select max(cum_cpu) from dba_daily_resource_usage_v1where--loginame=@vloginame and dbname=@vdbname--and convert(varchar (10),last_batch,101)=@var5)print @scr--exec @scrfetch next from cur1 into @vloginame, @vdbnameend--END INNER LOOPselect @var2 as "For date"deallocate cur1end--END OUTER LOOP************************************PROBLEM:Even though variable @var5 is being passed as '11/15/2004' inside thecursor fetch (see print @var5 inside the fetch), the value is not beingused to build the cursor. Hence, the cursor has no row set.Basically, the variable @var5 is not being processed/passed correctlyfrom outside the cursor to inside the cursor.Any help please.Thanks*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Dec 20, 2007
I have two queries that seem to be the same, but perform very differently. The first query runs very fast (7000+ records returned in <1 sec.). The execution plan shows that it uses a nested loop with index seeks on both tables.
select *
from t_loadbasic
where ld_nbr in (select ld_nbr from t_tripcombined where comp_date between '11/1/07' and '11/05/07')
The second query is almost the same, save the fact that it uses date variables instead of hard dates. The execution plan shows that it uses a hash match instead of a nested loop with an index scan on the main table (t_loadbasic). This query takes about 12 seconds to run.
declare @startdate datetime
,@enddate datetime
set @startdate = '11/1/07'
set @enddate = '11/5/07'
select *
from t_loadbasic
where ld_nbr in (select ld_nbr from t_tripcombined where comp_date between @startdate and @enddate)
I'm trying to figure out why the database executes these two statements so differently. BTW, I've tried switching the order of the tables. I've tried using joins instead of a subquery. The execution plan seems completely dependant on the use of variables. I can attach the execution plans if necessary.
I apologize if this is too simple a question, but I couldn't find an answer on any forums, web searches or BOL. Thanks in adavance.
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Jan 17, 2008
Hi friends, I've been stumped on this for almost a week now. Everything works in the stored procedure code below except for the 'INSERT INTO @Uppdates' block of code. I have a SQL Analyzer test driver and when the code gets to the SELECT statement below the INSERT INTO @Updates line the value of the select line is displayed on the screen and nothing gets written to @Updates. I hope I'm being clear about this. Any ideas? IF @Edit=1 AND LEN(@Changes) > 0
BEGIN
--Split and parse changes
DECLARE @curRec int, @nxtRec int, @Record varchar(8000), @TNum int, @TNam varchar(50), @PDesc varchar(512), @PChk varchar(8), @SNum varchar(12), @NScr varchar(10), @OScr varchar(10),
@curField int, @nxtField int, @curSRec int, @nxtSRec int, @subRec varchar(8000), @curSField int, @nxtSField int
DECLARE @NewProj table (
ProjectID int,
SchoolNumber varchar(20),
ArtTeacherNumber int,
TeacherNumber int,
TeacherName varchar(40),
ProjectDescription varchar(512) NULL,
[Checksum] varchar(20) NULL)
DECLARE @Updates table (
ProjectID int,
StudentNumber varchar(12),
NewScore varchar(10) NULL,
OldScore varchar(10) NULL)
SET @curRec = 1
WHILE @curRec IS NOT NULL
BEGIN
SET @nxtRec = NULLIF(CHARINDEX(CHAR(1), @Changes, @curRec), 0)
SET @Record = SUBSTRING(@Changes, @curRec, ISNULL(@nxtRec,8000)-@curRec) --Extract a class record
SET @curField = 1
SET @nxtField = NULLIF(CHARINDEX(CHAR(2), @Record, @curField), 0)
SET @TNum = SUBSTRING(@Record, @curField, ISNULL(@nxtField,1000)-@curField) -- Extract Teacher Number
SET @curField = @nxtField + 1
SET @nxtField = NULLIF(CHARINDEX(CHAR(2), @Record, @curField), 0)
SET @TNam = SUBSTRING(@Record, @curField, ISNULL(@nxtField,1000)-@curField) -- Extract Teacher Name
SET @curField = @nxtField + 1
SET @nxtField = NULLIF(CHARINDEX(CHAR(2), @Record, @curField), 0)
SET @PDesc = SUBSTRING(@Record, @curField, ISNULL(@nxtField,1000)-@curField) -- Extract Project Description
SET @curField = @nxtField + 1
SET @nxtField = NULLIF(CHARINDEX(CHAR(3), @Record, @curField), 0)-- Step over existing checksum
SET @PChk = RIGHT('0000000' + dbo.int2base(Checksum(@PDesc),16),8)-- Calculate new checksum based on project description that may have been changed.
SET @curField = @nxtField + 1
INSERT INTO @NewProj (ProjectID, SchoolNumber, ArtTeacherNumber, TeacherNumber, TeacherName, ProjectDescription, [Checksum])
SELECT DISTINCT Students.ProjectID, @SchoolNumber, @ArtTeacherNumber, @TNum, @TNam, @PDesc, @PChk
FROM @Students Students
WHERE Students.SchoolNumber=@SchoolNumber AND Students.TeacherNumber=@TNum
SET @curSRec = 1
WHILE @curSRec IS NOT NULL
BEGIN
SET @nxtSRec = NULLIF(CHARINDEX(CHAR(3), @Record, @curField), 0)
SET @subRec = SUBSTRING(@Record, @curField, ISNULL(@nxtSRec,8000)-@curField) -- Extract a score sub record. Consists of Student Number, new Score, old Score.
SET @curSField = 1
SET @nxtSField = NULLIF(CHARINDEX(CHAR(4), @subRec, @curSField), 0)
SET @SNum = SUBSTRING(@subRec, @curSField, ISNULL(@nxtSField, 1000)-@curSField) -- Extract Student Number
SET @curSField = @nxtSField + 1
SET @nxtSField = NULLIF(CHARINDEX(CHAR(4), @subRec, @curSField), 0)
SET @NScr = SUBSTRING(@subRec, @curSField, ISNULL(@nxtSField, 1000)-@curSField) -- Extract new Score
SET @curSField = @nxtSField + 1
IF @curSField > LEN(@subRec)
SET @Oscr = NULL-- If no Old Score specified
ELSE
BEGIN
SET @nxtSField = LEN(@subRec) + 1
SET @OScr = SUBSTRING(@subRec, @CurSField, ISNULL(@nxtSField, 1000)-@curSField) -- Extract old Score
END
-- Check for errors
IF ISNUMERIC(@SNum) = 0 OR @NScr IS NULL OR LEN(ISNULL(@PChk,0)) <> 8
BEGIN
SET @UpdateErr = 1
BREAK
END
-- Update the updates table and find ProjectID from existing data table
INSERT INTO @Updates (ProjectID, StudentNumber, NewScore, OldScore)
SELECT DISTINCT Students.ProjectID, @SNum, @NScr, @OScr
FROM @Students Students
WHERE Students.StudentNumber=@SNum
SET @curField = @nxtSRec + 1
SET @curSRec = @nxtSRec + 1
select * from @Updates
END
IF @UpdateErr = 1
BEGIN
BREAK
END
SET @curRec = @nxtRec + 1
END
Thanks in advance for looking at this,
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Dec 3, 2013
How can I generate the following result using nested loop and variables :
col1col2
15
16
17
25
26
27
35
36
37
45
46
47
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Nov 30, 2005
trouble with this...
i have a table that looks like this....
orderid=1 ordernumber=1 customernumber=1 product=1
orderid=2 ordernumber=1 customernumber=1 product=2
orderid=3 ordernumber=2 customernumber=2 product=5
how can i combine by the actual order
in other words 1 actual order has more then 1 orderid, i need this data more or less in 1 table or query for my form, i think.
if you know what im talking about, because i dont think i even do, haha, please help
thanks in advance for your time and understanding with my noob question.
Curt
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Feb 8, 2007
I have a database that contains a PERSONNEL table, a VISIT table, and a STARSHIP table.
I am trying to generate a single column list of the personnel that are from Vulcan (PERSONNEL.PLANET) and all starships that have visited Vulcan (VISIT.PLANET). VISIT.SHIP and STARSHIP.REGISTRY columns contain the ships identifiers. How would I accomplish this? I am just beginning sql so please be nice ;)
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Jun 21, 2006
Could Any body Please give me one example of each of three types of joins that is
Merge Join
Hash Join
Nested join
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Aug 2, 2006
If your prediction join is to a SQL datasource, you can easily write a SQL query which returns a nested table like:
SELECT
Predict([Subcategories],2) as [Subcategories]
FROM
[SubcategoryAssociations]
NATURAL PREDICTION JOIN
(SELECT
(SELECT 'Road Bikes' AS Subcategory
UNION SELECT 'Jerseys' AS Subcategory
) AS Subcategories
) AS t
What about if your datasource is a cube? Is there some special MDX syntax similar to the SQL syntax above? Or do you have to utilize the SHAPE/APPEND syntax as follows?
SELECT t.*, $Cluster as ClusterName
FROM [MyModel]
PREDICTION JOIN
SHAPE {
select [Measures].[My Measure] on 0,
[My Dimension].[My Attribute].[My Attribute].Members on 1
from MyCube
}
APPEND (
{
select [Measures].[Another Measure] on 0,
NON EMPTY [My Dimension].[My Attribute].[My Attribute].Members
*[Product].[Product].[Product].Members on 1
from MyCube
}
RELATE [[My Dimension]].[My Attribute]].[My Attribute]].[MEMBER_CAPTION]]]
TO [[My Dimension]].[My Attribute]].[My Attribute]].[MEMBER_CAPTION]]]
)
AS [My Nested Table] AS t
ON [MyModel].[Product].[Product] = t.[My Nested Table].[[Product]].[Product]].[Product]].[MEMBER_CAPTION]]]
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Oct 17, 2007
Hello,
I have this INNER JOIN that is fine to show all possible combinations. But I need to show only rows that have one or more Null values in tbIntersect.
Should I use nested LEFT JOINT? How?
This is the SQL statement:
sSQL = "SELECT DISTINCT tbCar100.Car100_ID, tbCar100.Description100 AS [Caractéristique 100], " & _
"tbCar200.Car200_ID, tbCar200.Description200 AS [Caractéristique 200], " & _
"tbCar300.Car300_ID, tbCar300.Description300 AS [Caractéristique 300], " & _
"tbCar400.Car400_ID, tbCar400.Description400 AS [Caractéristique 400], " & _
"tbCar500.Car500_ID, tbCar500.Description500 AS [Caractéristique 500], " & _
"tbCar600.Car600_ID, tbCar600.Description600 AS [Caractéristique 600], " & _
"tbCar700.Car700_ID, tbCar700.Description700 AS [Caractéristique 700], " & _
"tbProducts.Prod_ID, tbProducts.PartNumber AS [Part Number] , tbProducts.Description AS [Description] , tbProducts.DateAdded AS [Date] " & _
"FROM tbProducts INNER JOIN (tbCar700 INNER JOIN (tbCar600 INNER JOIN (tbCar500 INNER JOIN (tbCar400 INNER JOIN (tbCar300 INNER JOIN (tbCar100 INNER JOIN " & _
"(tbCar200 INNER JOIN tbIntersect ON tbCar200.Car200_ID = tbIntersect.Car200_ID) " & _
"ON tbCar100.Car100_ID = tbIntersect.Car100_ID) ON tbCar300.Car300_ID = tbIntersect.Car300_ID) ON tbCar400.Car400_ID = tbIntersect.Car400_ID) ON tbCar500.Car500_ID = tbIntersect.Car500_ID) ON tbCar600.Car600_ID = tbIntersect.Car600_ID) ON tbCar700.Car700_ID = tbIntersect.Car700_ID) ON tbProducts.Prod_ID = tbIntersect.Prod_ID " & _
";"
Here is the content of the tbIntersect table:
Car100_ID Car200_ID Car300_ID Car400_ID Car500_ID Car600_ID Car700_ID Prod_ID ID
1 1 1 1 1 1 1 1 1
1 2 1 1 1 1 1 19
1 3 1 1 1 1 1 20
I need to return the rows that have null data, ex: second row because Prod_ID is NULL and third row because Car300_ID is NULL. In fact I need the data from the other joint tables that correspond to these ID fields.
Thanks
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Mar 2, 2008
i have been trying to determine which is the most efficient, with regards to speed and efficiency, between a view and a common/nested table expression when used in a join.
i have a query which could be represented as index view or a common table expression, which will then be used to join against another table.
the indexed view will use indexes when performing the join. is there a way to make the common table expression faster than an indexed view?
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May 28, 2010
difference between FOR LOOP and FOREACH LOOP with example(if possible) in SSIS.
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Feb 22, 2006
I have a table with RowID(identity). I need to loop though the table using RowID(not using a cursor). Please help me.
Thanks
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Apr 30, 2008
Hello
Can any one tell me the difference between Cross Join, inner join and outer join in laymans language
by just taking examples of two tables such as Customers and Customer Addresses
Thank You
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Mar 3, 2006
I have a foreach loop that is supposed to loop through a recordset, however it doesn't loop. It just repeats the same row, row after row.
I would like to look into the recordset variable but I can't because it is a COM object and the ADODB namespace is not available in the script task.
Any solution to this? anyone experienced anything similar
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Jul 8, 2006
I have a table called Tbltimes in an access database that consists of the following fields:
empnum, empname, Tin, Tout, Thrs
what I would like to do is populate a grid view the a select statement that does the following.
display each empname and empnum in a gridview returning only unique values. this part is easy enough. in addition to these values i would also like to count up all the Thrs for each empname and display that sum in the gridview as well. Below is a little better picture of what I€™m trying to accomplish.
Tbltimes
|empnum | empname | Tin | Tout | Thrs |
| 1 | john | 2:00PM | 3:00PM |1hr |
| 1 | john | 2:00PM | 3:00PM | 1hr |
| 2 | joe | 1:00PM | 6:00PM | 5hr |
GridView1
| 1 | John | 2hrs |
| 2 | Joe | 5hrs |
im using VWD 2005 for this project and im at a loss as to how to accomplish these results. if someone could just point me in the right direction i could find some material and do the reading.
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Feb 23, 2006
I have source and destination table names in the database(one table) and I need to read the source and destination tables one by one...
My Lookp table is like the following...
Srn srctable desttable
1 SRC1 DEST1
2 SRC2 DEST2
3 SRC3 DEST3
Now I want one package to load from source to destination.. how do I do it.. I dont know how to use....
How do I run the pacakge for each of the rows... ..............................
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May 22, 2015
I have two xml source and i need only left restricted data.
how can i perform left restricted join?
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Oct 8, 2015
I was writing a query using both left outer join and inner join. And the query was ....
SELECT
       S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
       Production.Suppliers AS S LEFT OUTER JOIN
      (Production.Products AS P
        INNER JOIN Production.Categories AS C
[code]....
However ,the result that i got was correct.But when i did the same query using the left outer join in both the cases
i.e..
SELECT
       S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
       Production.Suppliers AS S LEFT OUTER JOIN
(Production.Products AS P
LEFT OUTER JOIN Production.Categories AS C
ON C.categoryid = P.categoryid)
ON
S.supplierid = P.supplierid
WHERE
S.country = N'Japan';
The result i got was same,i.e
supplier   country   productid   productname   unitprice   categorynameSupplier QOVFD   Japan   9   Product AOZBW   97.00   Meat/PoultrySupplier QOVFD   Japan  10   Product YHXGE   31.00   SeafoodSupplier QOVFD   Japan  74   Product BKAZJ   10.00   ProduceSupplier QWUSF   Japan   13   Product POXFU   6.00   SeafoodSupplier QWUSF   Japan   14   Product PWCJB   23.25   ProduceSupplier QWUSF   Japan   15   Product KSZOI   15.50   CondimentsSupplier XYZ   Japan   NULL   NULL   NULL   NULLSupplier XYZ   Japan   NULL   NULL   NULL   NULL
and this time also i got the same result.My question is that is there any specific reason to use inner join when join the third table and not the left outer join.
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Dec 23, 2014
I have two select statements, in between select statement taking UNION ALL . I need to avoid the error
Warning: The join order has been enforced because a local join hint is used.
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Aug 10, 2007
Scenario:
OLEDB source 1
SELECT ...
,[MANUAL DCD ID] <-- this column set to sort order = 1
...
FROM [dbo].[XLSDCI] ORDER BY [MANUAL DCD ID] ASC
OLEDB source 2
SELECT ...
,[Bo Tkt Num] <-- this column set to sort order = 1
...
FROM ....[dbo].[FFFenics] ORDER BY [Bo Tkt Num] ASC
These two tasks are followed immediately by a MERGE JOIN
All columns in source1 are ticked, all column in source2 are ticked, join key is shown above.
join type is left outer join (source 1 -> source 2)
result of source1 (..dcd column)
...
4-400-8000119
4-400-8000120
4-400-8000121
4-400-8000122 <--row not joining
4-400-8000123
4-400-8000124
...
result of source2 (..tkt num column)
...
4-400-1000118
4-400-1000119
4-400-1000120
4-400-1000121
4-400-1000122 <--row not joining
4-400-1000123
4-400-1000124
4-400-1000125
...
All other rows are joining as expected.
Why is it failing for this one row?
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Apr 14, 2015
I'm having trouble with a multi-table JOIN statement with more than one JOIN statement.
For each order, I need to return the following: CarsID, CarModelName, MakeID, OrderDate, ProductName, Total ordered the Car Category.
The carid (primary key) and carmodelname belong to the Cars table.
The makeid and orderdate belong to the OrderDetails table.
The productname and carcategory belong to the Product table.
The number of rows returned should be the same as the number of rows in OrderDetails.
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Aug 9, 2013
Why would I use a left join instead of a inner join when the columns entered within the SELECT command determine what is displayed from the query results?
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Jun 5, 2006
I have a merge join (full outer join) task in a data flow. The left input comes from a flat file source and then a script transformation which does some custom grouping. The right input comes from an oledb source. The script transformation output is asynchronous (SynchronousInputID=0). The left input has many more rows (200,000+) than the right input (2,500). I run it from VS 2005 by right-click/execute on the data flow task. The merge join remains yellow and the task never finishes. I do see a row count above the flat file destination that reaches a certain number and seems to get stuck there. When I test with a smaller file on the left it works OK. Any suggestions?
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Jul 25, 2007
I'm using SQL Server 2005.
A piece of software I wrote starting timing out on a query that left outer joins a table to a view. Both the table and view have approximately the same number of rows (about 170000).
The table has 2 very similar columns, one is a varchar(1) and another is varchar(100). Neither are included in any index and beyond the size difference, the columns have the same properties. One of the employees here uses the varchar(1) column (called miscsearch) to tag large sets of rows to perform some action on. In this case, he had set 9000 rows miscsearch value to "g". The query then should join the table and view for all rows where miscsearch is set to g in the table. This query takes at least 20 minutes to run (I stopped it at this point).
If I remove the "where" clause and join all rows in the two tables, the query completes in about 20 seconds. If set the varchar(100) column (called descrip) to "g" for the same rows set via miscsearch, the query completes in about 20 seconds.
If I force the join type to a hash join, the query completes using miscsearch in about 30 seconds.
So, this works:
SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER HASH JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE miscsearch = 'g' ORDER BY balance DESC
and this works:
SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE descrip = 'g' ORDER BY balance DESC
But this does't:
SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE miscsearch = 'g' ORDER BY balance DESC
What should I be looking for here to understand why this is happening?
Thanks,
john
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