Join Using A Substring Function

Jul 30, 2007

Hi All,
I am trying to achieve loading a fact table using my stage and dimesion data , I was planning to use a Lookup transformation to do this, however I am supposed to use a substring task to because the data in the stage table is in adifferent format from that in the dimensions, how do I incorporate this substring task within the data flow, any help is appreciated.


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Substring Function

Jun 20, 2008

it's early in the morning (well it is here anyway) and i need a shot of logic...

in the data base i'm currently working with i have a varchar field that holds either a number or a collection of numbers in square brackets. I need to extract the number or the first number in square brackets if it's a list. i know it's gonna be a simple one but my head just won't do it?? i'm trying with substring and charindex to determine the position of the '[' but just not getting it this morning

quick sample of what the data in this column may look like...

declare @t table (col varchar(30))
insert into @t
select '2' union all
select '[5] [4]' union all
select ' [12] [1]'

so i need to get...


OK, so i get this to work but only if there is actually square brackets

declare @t table (col varchar(30))
insert into @t
--select '2'union all
select '[5] [4]'union all
select ' [12] [1]'

select col
,substring(col, charindex('[',col)+1, charindex(']',col)-charindex('[',col)-1)
from @t


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Substring Function Error.....

Jul 29, 2003

select name, datalength(Name),
charindex('_2_', Name),
substring(name, 5, charindex('_2_', Name) - 0)
-------------------- ----------- ----------- -----------
Job_4927_2_7Sun 30 9 4927_2_7S
Job_250144_2_6Sat 34 11 250144_2_6S
Job_30197_2_1Mon 32 10 30197_2_1M

but when I use following - 3)
select name, datalength(Name),
charindex('_2_', Name),
substring(name, 5, charindex('_2_', Name) - 3)

I get the result I want (last column):
Job_4927_2_7Sun 30 9 4927_2
Job_250144_2_6Sat 34 11 250144_2
Job_30197_2_1Mon 32 10 30197_2

but also with an error:
Server: Msg 536, Level 16, State 3, Line 1
Invalid length parameter passed to the substring function.


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What Is The Max Length Of Substring Function.

Mar 16, 2001

hi thanks for your help

update vendor_invoice
set de_ftpdownload= (select SUBSTRING(de_ftpdownload,1,CHARINDEX('.',de_ftpdow nload,0)-1)as de_ftpdownload from vendor_invoice)
where vendor_invoice_id =931

This get me this error.... so what is the max allowable length of substring function.

Server: Msg 536, Level 16, State 3, Line 1
Invalid length parameter passed to the substring function.
The statement has been terminated.

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SQL 2000 - Substring Function

Jun 20, 2004


I want to select the characters before "-" from Column A.
For example:

I'd would like to select it as:

Please Help!!!!!!!!!!!!!!!!!!!!! :confused:

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Problem In Substring Function

Oct 11, 2005

Harshi writes "Hello SQL Team!!

I have a problem in Substring function. There is a Text data type field in my Table and it has large no of characters. I want to get the whole text as the result. The problem is its just giving me 300 characters from a row, as the result.

My statement as follows;


SELECT a.L2Topic, a.TopicIndex, a.L1Topic,
Substring(b.Des, 1, 900), b.PriceGroup, b.Price,
b.L1TopicIndex, b.Qty, b.OtherPrice,
c.Customer, c.Address, c.Date, c.ChassyNo,
c.VehicleNo FROM wshpTopicIndex a

LEFT JOIN wshpEstimateDetails b ON (a.EstimateID = b.EstimateID)
INNER JOIN wshpEstimateIndex c ON (b.EstimateID = c.EstimateID)

WHERE (b.RandomNo = a.TopicIndex) AND (a.EstimateID = 54)

GROUP BY a.L2Topic, Substring(b.Des, 1, 900), c.Customer, a.TopicIndex, a.L1Topic, b.Qty,
b.PriceGroup, b.Price, b.L1TopicIndex, b.OtherPrice, c.Address, c.Date, c.ChassyNo, c.VehicleNo

ORDER BY b.PriceGroup, b.L1TopicIndex


Can some one please help me to get rid of this problem??

Thank you,

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Substring Function Can't Figure Out

Mar 5, 2008

I have a SQL query in Visual Studio (SSRS). I have a GL Account field that is formatted such as 100-400-123-1234. I wanted to use the substring function to pull out the second set of numbers which I can assign a location:

CASE WHEN substring(GlAccount,5,3)= '400' THEN 'Gainesville'
CASE WHEN substring(GlAccount,5,3)= '401' THEN 'Aledo'

I tried this and it comes back with syntax errors. Can anyone tell me how to approach this as I have a list of about 35 locations that I need to do like this. Thanks.

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Is There A Function Like SUBSTRING But For Integers?

Apr 14, 2006

I'm wondering if there is a function in SQL that works like SUBSTRING function but for integers. Like for example if I have a number like 20010112 and I want to cut it to the first for digits so that it reads 2001?

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Substring Function Requires 3 Arguments

Aug 30, 2007

Substring ('(' + left(@phone,3) + ')') + substring(@phone,4,3) + '-' + substring(@phone,7,4) + 'x' + right(@phone,4) getting an error on this code help please.

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Performance Issue Using Left Or Substring Function

Oct 18, 2007


I've tried the following query in SQL SERVER 2005, SQL Express and MACCESS.

select * from Table1 where drid in (SELECT DrID FROM Table2 WHERE (substring(PostalCode,1,3) IN ('B0E','B1P','B2H','B2Y','B3A','B3M','B4A','B4H','E1A','E1C','E1N','G0A', …)) and (substring(Telephone,1,3) IN ('204','250','306','403','416','418','450','506','514','519','604','613','705','780','807','819','902','905')))

The query is using two table. The first one Table1 is a table with user info. The second table Table2 has the info concerning a survey.

The Table1 containt approx. 6000 row and Table2 containt only 210 rows

The table structure from the different environment(MACCESS, SQL SERVER 2005, Sql Server Express 2005) are the same. The Table1 containt the field "PostalCode" and "Telephone".

When I execute this query on MACCESS and in SQL Server 2005 the result are approximately the same(Less than half second). But there a performance issue in Sql Express 2005. The query take an execution time between 7 and 9 secondes.

When I add a condition using a field from tblResponsePQ2Part1 ex: QA=1
like in the following query :
select * from Table1 where drid in (SELECT DrID FROM Table2
WHERE (QA = 1 substring(PostalCode,1,3) IN ('B0E','B1P','B2H','B2Y','B3A','B3M','B4A','B4H','E1A','E1C','E1N','G0A', …)) and (substring(Telephone,1,3) IN ('204','250','306','403','416','418','450','506','514','519','604','613','705','780','807','819','902','905')))
the query take an execution time of ~15 secondes!!!!

This issue only happen in Sql Server Express, on the others cases(mean MSAccess, Sql Server) the execution time is less than half second.

It’s weird because, Sql Express 2005 is supposed to be more performant
than MACCESS, and have the same performance than Sql Server Professional Edition. Please Help Me!!!!

Anyone have an idea why?

Mathieu Desbiens

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Substring And Patindex Having An User Defined Function

Oct 30, 2007

Hi All,
Can we use the SUBSTRING or PATINDEX function with a User Defined Function as one of the parameters? Something like this:

Code Block
Select SUBSTRING(Select * from DB.dbo.Function('Parameter'), PATINDEX('%\%', Select * from DB.dbo.Function('Parameter'), 8)


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Invalied Length Parameter Passed The Substring Function

Nov 12, 2004

Does anyone know what the above error message means?

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Invalid Length Parameter Passed To Substring Function

Mar 3, 2014

I have a sql job which will execute the below stored proc.

Basically it Refresh the data by truncating the tables and using BCP to import the data. Job was running fine but today got a error message.

Invalid length parameter passed to the substring function. [SQLSTATE 42000] (Error 536). The step failed.

USE [database]
CREATE Procedure [dbo].[Refresh_tables]

[Code] ......

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SUBSTRING In User Defined Function - Invalid Column

May 23, 2007

I'm trying to create a function that splits up a column by spaces, andI thought creating a function that finds the spaces with CHARINDEX andthen SUBSTRING on those values would an approach. I get an errorsaying that the I have an Invalid column 'Course_Number'. Not surewhy but I am very new to User Defined Functions. Here is what I haveso far:CREATE FUNCTION CourseEvalBreakdown(@fskey int)RETURNS @CourseTable TABLE(Col CHAR(2),Area CHAR(4),Number CHAR(4),Section CHAR(4),Term CHAR(3))ASBEGINDECLARE@Ind1 tinyint,@Ind2 tinyint,@Rows intDECLARE @crstbl TABLE (FStaffKey int,Course_Number char(20),Term char(3),Col char(2),Area char(4),Number char(4),Section char(3))INSERT INTO @crstbl (FStaffKey, Course_Number, Term)SELECT FStaffKey, Course_Number, TermFROM EvalWHERE FStaffKey = @fskeySET @Rows = @@rowcountWHILE @Rows 0BEGINSET @Ind1 = CHARINDEX(' ', Course_Number, 4)SET @Ind2 = CHARINDEX(' ',Course_Number, (CHARINDEX(' ',Course_Number, 4)+1))UPDATE @crstblSET Col = SUBSTRING(Course_Number, 1, 2)WHERE FStaffKey = @fskeyUPDATE @crstblSET Area = UPPER(SUBSTRING(Course_Number, 4, @Ind1-4))WHERE FStaffKey = @fskeyUPDATE @crstblSET Number = UPPER(SUBSTRING(Course_Number, @Ind1+1, (@Ind2-@Ind1)-1))WHERE FStaffKey = @fskeyUPDATE @crstblSET Section = SUBSTRING(Course_Number, @Ind2+1, 3)WHERE FStaffKey = @fskeyENDINSERT @CourseTableSELECT Col, Area, Number, Section, Term FROM @crstblRETURNENDGO

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Invalid Length Parameter Passed To The SUBSTRING Function.

Feb 1, 2008


I was trying to execute the following query.

select substring(ISNULL(CAST(FullAdress AS NVARCHAR(MAX)),''),1,charindex(',',ISNULL(CAST(FullAdress AS NVARCHAR(MAX)),''))-1) from tbl_lrf_company_details_with_codes

but i am getting the error as "Invalid length parameter passed to the SUBSTRING function."
Please advice
Thanks In advance

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Invalid Length Parameter Passed To The SUBSTRING Function

May 27, 2008




(CONVERT (VARCHAR (255), D.CurrentXmlValue)), --expression

(CHARINDEX ('>', CONVERT (VARCHAR (255), D.CurrentXmlValue)) + 1), --start

( (LEN (CONVERT (VARCHAR (255), D.CurrentXmlValue))) -

(CHARINDEX ('>', CONVERT (VARCHAR (255), D.CurrentXmlValue))*2) - 1


) AS Version


This does not work while



(CONVERT (VARCHAR (255), D.CurrentXmlValue)) as expression, --expression

(CHARINDEX ('>', CONVERT (VARCHAR (255), D.CurrentXmlValue)) + 1) as start, --start

( (LEN (CONVERT (VARCHAR (255), D.CurrentXmlValue))) -

(CHARINDEX ('>', CONVERT (VARCHAR (255), D.CurrentXmlValue))*2) - 1

) as length --length

--) AS Version


I get

Msg 536, Level 16, State 5, Line 2

Invalid length parameter passed to the SUBSTRING function.
Any idea why i am getting this??
I am trying to get rid of xml tags in the column.


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Error: Invalid Length Parameter Passed To The SUBSTRING Function.

Sep 28, 2007


I am using a simple procedure to pivot results (found in another forum and adapted it). It is done on SQL Server 2005 server with all service packs. Procedure:
ALTER Procedure [dbo].[EthnicityPivot] @StDate as Datetime, @EndDate as Datetime
DECLARE @Teams varchar(2000)

truncate table ForEthnicPivot

INSERT INTO ForEthnicPivot
FROM dbo._EthnicityByTeamEpisode
where Startdate between @StDate and @EndDate
GROUP BY Ethnicity, Team

SET @Teams = ''
--// Get a list of the pivot columns that are important to you.

SELECT @Teams = @Teams + '[' + Team + '],'
FROM (SELECT Distinct Team FROM ForEthnicPivot) Team
--// Remove the trailing comma

SET @Teams = LEFT(@Teams, LEN(@Teams)-1)
--// Now execute the Select with the PIVOT and dynamically add the list
--// of dates for the columns
EXEC( 'SELECT * FROM ForEthnicPivot PIVOT (SUM(countID) FOR Team IN (' + @Teams + ')) AS X' )

I can call the function:
exec EthnicityPivot '01/01/2007','09/09/2007'

and it works fine in SQL analyzer, but when I want to use it in Visual Studio in a new report I am getting this error

There is an error in the query. Invalid length parameter passed to the SUBSTRING function. Incorrect syntax near ')'.

Anyone had similar error and sorted it?



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Sql 2005 ... Invalid Length Parameter Passed To The SUBSTRING Function.

Oct 9, 2006

I am new at sql 2000 and 2005, I have created a package in 2005 which I am trying to execute on a daily bases by creating a job. At first because of security issues the job would not execute. Hence, I had to create a credential and a proxy to run the job with sa account. Now it is giving me this error,
SQLServer Error: 536, Invalid length parameter passed to the SUBSTRING function.
Through research I have no clue as what I need to do, or where to look.
The package runs without error when I execute the package itself.
Any help is greatly appreciated.

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Error In Query; Invalid Length Parameter Passed To The Substring Function

Nov 28, 2005

i got errro mess "Invalid length parameter passed to the substring function" from this below. Anyone how can give me a hint what cause this, and how i can solve it? if i remove whats whitin thoose [] it works, i dont use [] in the code :)
VLF_InfectionDestination is nvarchar 254

SELECT TOP 10 tb_AVVirusLog.VLF_VirusName, COUNT(tb_AVVirusLog.VLF_VirusName) AS number
__CustomerMachines002 ON tb_AVVirusLog.CLF_ComputerName = __CustomerMachines002.FalseName
WHERE (CONVERT(varchar, tb_AVVirusLog.CLF_LogGenerationTime, 120) BETWEEN @fyear + @fmonth + @fday AND @tyear + @tmonth + @tday) AND
(__CustomerMachines002.folder_id = @folderId) [OR
(CONVERT(varchar, tb_AVVirusLog.CLF_LogGenerationTime, 120) BETWEEN @fyear + @fmonth + @fday AND @tyear + @tmonth + @tday) AND
(tb_AVVirusLog.VLF_InfectionDestination LIKE N'%@%')]
GROUP BY tb_AVVirusLog.VLF_VirusName
HAVING (NOT (tb_AVVirusLog.VLF_VirusName LIKE N'cookie'))

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Odd Error Upon SqlDataReader.Read() Invalid Length Parameter Passed To The Substring Function.

Nov 12, 2003

An application I developed normally works great, but it seems that when processing a certian record (and none of the others so far), SQL Server throws this error:
"Invalid length parameter passed to the substring function."

Here's the code in question:

orderReader = orderCommand.ExecuteReader()


Private Sub setControls(ByVal dr As SqlDataReader)
If (dr.Read()) Then '<--*******problem line*******

The SqlDataReader (orderReader) doesn't blow up or anything until I call .Read() (and, as mentioned, this problem only occurs for one order). What could be happening here?

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String Index Function (substring / Charindex) - Extract Specific Characters From Data

Aug 5, 2013

SQL Query. What i need is to be able to extract specific characters from data.

Eg name

1.2-KPIA1-App-00001 this is a name i require, but i also require the '1.2' and the 'KPIA1' to be displayed in new columns in the results

i.e. 1.2-KPIA1-App-00001 1.2 KPIA1

*I need this in part of a script as there is thousands of rows of data.

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Syntax On A Join And RIGHT Function

Mar 31, 2005


Trying to join two tables together.

Select * from ...

inner join

on table1.ID = table2.ID;

this works fine, however i want to use the RIGHT function so that i get the last four digits of the ID. this causes a parse error:

inner join on table1.right([ID],4) = table2.right([ID],4);

searched a bit but couldn't find a way to do what im trying to accomplish. is there a proper syntax?


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Call Function For Inner Join

Aug 10, 2007

I have a procedure which has query
like Query 1.

Query 1

Select Clinetid
from clinet
inner join {

select centerid from GetChildCenter(@Centerid)
select centerid from getParentCenter(@Centerid)
} as Center c

on c.Centerid = client.Centerid

Query 2

declare @Center table ( centerid int)
insert into @Center

select centerid from getchildCenter(@Centerid) union all select centerid from getparentcenter(@Centerid)

Select Clinetid
from clinet
inner join @Center c on c.Centerid = client.Centerid

I just want to know which one is better performance wise..
because there is millions of rows for table center which is used by function getChildCenter() and GetparentCenter()

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Nov 28, 2007


I am running into trouble performing a second join on a column while using aggregate functions over that table.

What I think is happening is that the aggregate values (sum, avg, count) are being multiplied because I am joining on the same table a second time, but I don't know how to fix or avoid this problem.

Here's the query:


CAST(ro.xing_tc_no AS INT) AS loc_id,
SUM(ro.total_fatal) AS tot_fatal,
SUM(ro.total_serious) AS tot_serious,
SUM(ro.total_minor) AS tot_minor,
COUNT(ro.report_no) AS tot_accidents,
AVG(ro.NO_OCCUPANTS) AS num_occupants

UserHotspots uh

LEFT JOIN rods_k_crossing AS rkc
ON rkc.location_id = uh.CrossingID

LEFT JOIN rods_occurrence AS ro
ON rkc.tc_location_nbr = ro.xing_tc_no



The second join is also performed on rods_k_crossing and that is when the sums, avgs, and counts get multiplied. If I take that second join out the numbers come out fine.

Thanks for any help!

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Mar 10, 2008


I want to join a table valued function but function parameter should left joined table's primary key .... this is posible in oracle by pipeline method ..
SELECT A.Col1,A.Col2,B.Col1,B.Col2
FROM Tab As A LEFT OUTER JOIN TblFunction(A.Pkey) B
ON A.Col1 = B.Col1

any body help me ... thanx in advance..

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How To Join Using A Table-valued Function?

Oct 22, 2007

Hi there. I've hit some gap in my SQL fundementals. I'm playing with table-valued functions but I can't figure out how to join those results with another table. I found another way to hit my immediate need with a scalar function, but ultimately I'm going to need to use some approach like this. What am I misunderstanding here?

The Given Objects:
function Split(stringToSplit, delimiter) returns table (column: token)
table Words (column: Words.word) -- table of predefined words
table Sentences (column: Sentences.sentence) -- table of sentences; tokens may not be in Words table, etc

The Problems:
1) how do I query a set of Sentences and their Tokens? (using Split)
2) how do I join tables Sentences and Words using the Split function?

The Attempts:
select word, sentence, token
from Words,
dbo.Split(sentence, ' ') -- implicitly joins Split result with Sentences?
where word = token

resulting error: "'sentence' is not a recognized OPTIMIZER LOCK HINTS option."

select word, sentence
from Words, Sentences
where word in (select token from dbo.Split(sentence, ' ')) -- correlated subquery?

resulting error: "'sentence' is not a recognized OPTIMIZER LOCK HINTS option."

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Aug 19, 2006

A have a number of similar tables and what I want to do is to get the count of records grouped by day of week. All tables have date as an indexed unique column but the actual timestamps differs and have no relation. For one table I use this simple querry:

Select DatePart(dw,dato) AS DOW, Count(dato) AS NOR FROM AWP2
where dato > '2006-08-11'
Group By DatePart(dw,dato)

A typical result:

3           8934
6           22397
7           23328
1           23401
4           1938
2           24399
5          1112


Trying to join two or more tables in all sorts of variants of this:

Select datePart(dw,a1.dato) AS DOW1,Count(a1.dato) [Amount 1],
datePart(dw,a2.dato) AS DOW2, Count(a2.dato) [Amount 2]
FROM AWP1 A1 Inner Join AWP2 A2 on datePart(dw,a1.dato) = datePart(dw,a2.dato)
Where a1.dato > '2006-08-11' AND a2.dato > '2006-08-11'
Group By datePart(dw,a1.dato), datePart(dw,a2.dato)

Here I get this as a typical result:

DOW1   Amount 1     DOW2      Amount 2
6           332953802   6            332953802
3           42248886     3            42248886
1           330281714   1            330281714
7           335759904   7            335759904
4           1232568      4            1232568
5           210168        5            210168
2           366985359   2           366985359

Where the numbers are way off.

Any suggestions?

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Jun 23, 2014

This is so complicated (for me) because I usually only work with single table and simple queries (SELECT, INSERT, UPDATE), but now I am in a situation where I am stuck.

What I am trying to archive is that: when a project manager logged-into his/her account, a grid-view will show a quick overview for all of his/her projects (id, created date, name and how many files are in pending) like below picture:

3 tables will be involved are:

Sample data for manager_id = 11

I tried this query but it not worked, it seems to display all columns right but the COUNT pending files column (assume the manager_id = 11)

SELECT COUNT(file_id) as 'Pending files', projects.project_id, projects.project_name, projects.status, projects.start_date
FROM ((project_manager
ON project_manager.mag_id = files.manager_id AND project_manager.mag_id = 11 AND file_status = 'Pending')
INNER JOIN projects
ON projects.project_id = project_manager.project_id)
GROUP BY projects.project_id, projects.project_name, projects.status, projects.start_date
ORDER BY projects.status, projects.start_date DESC

result of this query:

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Jan 1, 2015

I found something very strange...stufff function working with self join but not working with left or right join,. I have a table

**Id name**

1 samar

1 Harry

2 jack

I want the output as

**Id name**

1 samar Harry

2 jack

The below query works fine with self join

Select, stuff ((select ` ` + from #test a where =
for xml path (``)),1,1,``)

From #test b
Group by id

But when i do right join i get error _ invalid object name `b`. ....

Select, stuff ((select ` ` + from #test a
right join b on = for xml path (``),1,1,``)

From #test b
Group by id

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Dec 26, 2007

Hello, thanks in advance for reading this. I am having difficulty trying to get a statement to work.

There is a MAIN table:
ItemNo int identity(1,0),
ItemType tinyint

There is a WETPAINT table:
ItemNo int,
Color varchar(20)

There is a DRYPAINT table:
ItemNo int,
Color varchar(20)

Now, what I want to do is JOIN the MAIN table to either the WETPAINT table or the DRYPAINT table depending on the value of MAIN.ItemType

So I created a table function called getTable:

CREATE FUNCTION [dbo].[gettable]
@ItemType int = 1
@thistable TABLE
Color varchar(20)

if @ItemType = 1
insert into @thistable (color) select color from WETPAINT
if @ItemType = 2
insert into @thistable (color) select color from DRYPAINT

This is all fine and dandy if I iterate through the MAIN table one row at a time, but how can I JOIN the tables, like:

SELECT MAIN.ItemNo, a.Color
INNER JOIN gettable(Main.ItemNo) as a
ON a.ItemNo = MAIN.ItemNo

Obviously, there is more than one field in the DRYPAINT and WETPAINT tables, and there is a need to have both tables instead of combining them into one.

Any help in how to create a table alias by passing a value from the select statement would be greatly appreciated! Thanks again.

PS -- I am trying to create a view with this, so I can't use variables and iterate through the MAIN table one row at a time.

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Sep 6, 2006


Can someone explain why this code contains the following error:

Msg 4104, Level 16, State 1, Line 2

The multi-part identifier "TheTable.StartValue" could not be bound.

CREATE FUNCTION MyFunction(@StartValue int)



NextValue int NOT NULL




INSERT INTO @MyTable(NextValue)

VALUES (@StartValue + 1)

INSERT INTO @MyTable(NextValue)

VALUES (@StartValue + 2)






StartValue int NOT NULL



INSERT INTO TheTable(StartValue)


INSERT INTO TheTable(StartValue)






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Mar 31, 2015

I'm having some performance issues with a TSQL query. It's a complex statement but the main issue is the correlated query.

How can I convert this

(SELECT SUM(lt2.col3)
FROM dbo.MyTable2 lt2
WHERElt2.col1 = lt.col1 AND lt2.col2 = lt.col2 AND = ) AS Result
FROM dbo.MyTable1 t1
... to an inner join or a sql2012 window function?

By the way, I just added the TOP 5 myself while testing. It's not in the main query.

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May 13, 2015

I have a few tables I am trying to join to create a report. Everything was working fine until I tried to add an aggregate Sum function to a column (MaxCap) in table ctfBarn. 

x.*, y.division, y.department, y.location
,(right(z.SvcMgrName,len(z.SvcMgrName)-len(left(z.SvcMgrName,CHARINDEX(', ',z.SvcMgrName)-1))-2)+' '+
left(z.SvcMgrName,CHARINDEX(', ',z.SvcMgrName)-1))AS SvcMgrName
,(right(z.SrSvcName,len(z.SrSvcName)-len(left(z.SrSvcName,CHARINDEX(', ',z.SrSvcName)-1))-2)+' '+

[Code] .....

I think I probable need to include a group by but can't figure out the correct syntax.

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