OSQL DELETE Using LIKE, With A Cascading Effect

Nov 16, 2006

Edit: Sorry This is OSQL.

What I use as my query is:
"DELETE FROM timerecord WHERE Actual_Time_In LIKE '11.12.2006%'"

The row of Actual_Time_In is formatted with Date and time (MM.DD.YYYY HH:MM:SS) sometimes there are ten records and I'd rather not have to remove them from the table one at a time. However, even though I have a record that is '11.12.2006 22:43:00' my delete doesn't work osql states I have 0 rows affected.
This is only MSDE so I don't have anyother way to open the table.

Sometimes these records have other records that reference them. Is there anyway to do a cascading delete without it getting to complex?


Thanks of all your help, I am just a tech support guy beating his head against a wall..

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Cascading Deletes - Which Is Better - A Trigger Or Foreign Key Cascading Delete?

Aug 17, 2005

I need to implement my cascading deletes on a SQL database.  Is it better (performance/reliablility-wise) to use the Foreign Key Cascading Deletes or to just write my own triggers to do the deletes?I was hoping someone had experimented and found which works best.

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SQL - Cascading Delete, Or Delete Trigger, Maintaining Referential Integrity - PLEASE HELP ME!!!

Nov 13, 2006

I am having great difficulty with cascading deletes, delete triggers and referential integrity.

The database is in First Normal Form.

I have some tables that are child tables with two foreign keyes to two different parent tables, for example:

Table A
/
Table B Table C
/
Table D

So if I try to turn on cascading deletes for A/B, A/C, B/D and C/D relationships, I get an error that I cannot have cascading delete because it would create multiple cascade paths. I do understand why this is happening. If I delete a row in Table A, I want it to delete child rows in Table B and table C, and then child rows in table D as well. But if I delete a row in Table C, I want it to delete child rows in Table D, and if I delete a row in Table B, I want it to also delete child rows in Table D.

SQL sees this as cyclical, because if I delete a row in table A, both table B and table C would try to delete their child rows in table D.

Ok, so I thought, no biggie, I'll just use delete triggers. So I created delete triggers that will delete child rows in table B and table C when deleting a row in table A. Then I created triggers in both Table B and Table C that would delete child rows in Table D.

When I try to delete a row in table A, B or C, I get the error "Delete Statement Conflicted with COLUMN REFERENCE". This does not make sense to me, can anyone explain? I have a trigger in place that should be deleting the child rows before it attempts to delete the parent row...isn't that the whole point of delete triggers?????

This is an example of my delete trigger:

CREATE TRIGGER [DeleteA] ON A
FOR DELETE
AS
Delete from B where MeetingID = ID;
Delete from C where MeetingID = ID;

And then Table B and C both have delete triggers to delete child rows in table D. But it never gets to that point, none of the triggers execute because the above error happens first.

So if I then go into the relationships, and deselect the option for "Enforce relationship for INSERTs and UPDATEs" these triggers all work just fine. Only problem is that now I have no referential integrity and I can simply create unrestrained child rows that do not reference actual foreign keys in the parent table.

So the question is, how do I maintain referential integrity and also have the database delete child rows, keeping in mind that the cascading deletes will not work because of the multiple cascade paths (which are certainly required).

Hope this makes sense...
Thanks,
Josh


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Cascading Delete?

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I use SQL Server 2005I have tables tblUserData, tblUsersAndGuestbook, tblGuestbooktblUserdata contains:UserCode   intUsername   nvarchar(50)tblUsersAndGuestbook contains:Usercode    int   (FK to tblUserData)GBEntryCode    inttblGuestbookGBEntryCode    int   (FK to tblUsersAndGuestbook)GBText      textNow...if I delete a user in tblUserData I want to also delete the entries in tblUsersAndGuestbook AND in tblGuestbook.I've heard something about cascading delete, but how can i configure that in my database?Or do I manually need to delete all entries from code?

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Hi,
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Cascading Delete ...

Sep 14, 2004

Procedure spDeleteRows
/*
Recursive row delete procedure.

It deletes all rows in the table specified that conform to the criteria selected,
while also deleting any child/grandchild records and so on. This is designed to do the
same sort of thing as Access's cascade delete function. It first reads the sysforeignkeys
table to find any child tables, then deletes the soon-to-be orphan records from them using
recursive calls to this procedure. Once all child records are gone, the rows are deleted
from the selected table. It is designed at this time to be run at the command line. It could
also be used in code, but the printed output will not be available.
*/
(
@cTableName varchar(50), /* name of the table where rows are to be deleted */
@cCriteria nvarchar(1000), /* criteria used to delete the rows required */
@iRowsAffected int OUTPUT /* number of records affected by the delete */
)
As
set nocount on
declare @cTab varchar(255), /* name of the child table */
@cCol varchar(255), /* name of the linking field on the child table */
@cRefTab varchar(255), /* name of the parent table */
@cRefCol varchar(255), /* name of the linking field in the parent table */
@cFKName varchar(255), /* name of the foreign key */
@cSQL nvarchar(1000), /* query string passed to the sp_ExecuteSQL procedure */
@cChildCriteria nvarchar(1000), /* criteria to be used to delete
records from the child table */
@iChildRows int /* number of rows deleted from the child table */

/* declare the cursor containing the foreign key constraint information */
DECLARE cFKey CURSOR LOCAL FOR
SELECT SO1.name AS Tab,
SC1.name AS Col,
SO2.name AS RefTab,
SC2.name AS RefCol,
FO.name AS FKName
FROM dbo.sysforeignkeys FK
INNER JOIN dbo.syscolumns SC1 ON FK.fkeyid = SC1.id
AND FK.fkey = SC1.colid
INNER JOIN dbo.syscolumns SC2 ON FK.rkeyid = SC2.id
AND FK.rkey = SC2.colid
INNER JOIN dbo.sysobjects SO1 ON FK.fkeyid = SO1.id
INNER JOIN dbo.sysobjects SO2 ON FK.rkeyid = SO2.id
INNER JOIN dbo.sysobjects FO ON FK.constid = FO.id
WHERE SO2.Name = @cTableName

OPEN cFKey
FETCH NEXT FROM cFKey INTO @cTab, @cCol, @cRefTab, @cRefCol, @cFKName
WHILE @@FETCH_STATUS = 0
BEGIN
/* build the criteria to delete rows from the child table. As it uses the
criteria passed to this procedure, it gets progressively larger with
recursive calls */
SET @cChildCriteria = @cCol + ' in (SELECT [' + @cRefCol + '] FROM [' +
@cRefTab +'] WHERE ' + @cCriteria + ')'
print 'Deleting records from table ' + @cTab
/* call this procedure to delete the child rows */
EXEC spDeleteRows @cTab, @cChildCriteria, @iChildRows OUTPUT
FETCH NEXT FROM cFKey INTO @cTab, @cCol, @cRefTab, @cRefCol, @cFKName
END
Close cFKey
DeAllocate cFKey
/* finally delete the rows from this table and display the rows affected */
SET @cSQL = 'DELETE FROM [' + @cTableName + '] WHERE ' + @cCriteria
print @cSQL
EXEC sp_ExecuteSQL @cSQL
print 'Deleted ' + CONVERT(varchar, @@ROWCOUNT) + ' records from table ' + @cTableName
--------
The above code is good .. but has limitation...throws an error:
Server: Msg 217, Level 16, State 1, Procedure spDeleteRows, Line 58
Maximum stored procedure, function, trigger, or view nesting level exceeded (limit 32).

Can anyone out there suggest a better way of implementing on a database without a limitation of levels.. we are talking about a HUGE DB with lots of table and FK referentials..

Please advice.. or solve the problem..
Thank you

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Jul 20, 2005

I use cascading delete on my SQL Server Database. I am experiencing along query time on my highest level delete, 10 minutes. If I deletefrom each table manually and then delete the parent, I will usually bedone in less than a minute. Any suggestions?

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Aug 18, 2007

If we want to maintain the data in relationships.
There are two ways to do it.
1. Auto (Like Cascading Update And Delete)
2. Manually (Like In Stored Procedures)
I read an intresting article
http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=419
In this article Imar has choosen the second way (Manually).
And when I talk to Imar.
He said, "Cascading deletes would have worked equally well in this situation. However, I personally don't like them too much. I am much rather in control, enabling me to delete what I want and when I want it. I could, for example, keep certain data for "time travelling scenarios" (e.g. the state things were in some time ago) or I might want to keep it for other purposes."
Can any one help me to choose the better one.
 
Waiting for helpful replies.

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if possible please send us the T SQL Statements .

Thanks in Advance
Geenu
Ajaz Dawre

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Recursive Trigger For Cascading Delete Doesnt Go More Than One Level

Oct 3, 2005

hello guysi am using a table that its secondary key connected to its primary key...and as sql server 2000 doesnt allow cascade delete fore such,i had to write a trigger myselfso i wrote the following triggerCREAT TRIGGER nameON tableFOR DeleteASBEGINIF @@ROWCOUNT >0Delete from table where table.parentID in (select sortID from deleted);ENDthen i went to the table and i tried to delete...and it gave me an error....that there are records that have there parentID= sortID of the table i am trieng to delete...so i deleted the relationship...and kept the triggerand now ...when i delete one...it deletes one level down....but not more....i mean when i delete sortID=4it deletes all the records that has parentID=4...and NOT more..whereas my aim was to have it recursive not to have records lost in my databasehope i explained good as much as i hope to find an answer soon...a clear one...and thanks in advanced...

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Cascading Delete And Finding Table Reference Level

Feb 16, 2008

This function will generate all DELETE statements in correct order to perform a CASCADING delete.
For self-joined tables, it will generate the T-SQL code to "unwind" the table, also in correct order!CREATE FUNCTION dbo.fnCascadingDelete
(
@Schema NVARCHAR(128) = NULL,
@Table NVARCHAR(128) = NULL
)
RETURNS@Return TABLE
(
RowID INT PRIMARY KEY CLUSTERED,
IsSelfJoin TINYINT NOT NULL,
HasPk TINYINT NOT NULL,
[SQL] NVARCHAR(4000) NOT NULL
)
AS
BEGIN
DECLARE@Constraints TABLE
(
RowID INT NOT NULL,
Indent SMALLINT NOT NULL,
[Catalog] NVARCHAR(128) NOT NULL,
[Schema] NVARCHAR(128) NOT NULL,
[Table] NVARCHAR(128) NOT NULL,
[Column] NVARCHAR(128),
pkCatalog NVARCHAR(128),
pkSchema NVARCHAR(128),
pkTable NVARCHAR(128),
pkColumn NVARCHAR(128),
pkType NVARCHAR(128),
pkSize INT,
IsSelfJoin TINYINT NOT NULL,
HasPk TINYINT NOT NULL
)

INSERT@Constraints
(
RowID,
Indent,
[Catalog],
[Schema],
[Table],
[Column],
pkCatalog,
pkSchema,
pkTable,
pkColumn,
pkType,
pkSize,
IsSelfJoin,
HasPk
)
SELECTRowID,
Indent,
[Catalog],
[Schema],
[Table],
[Column],
pkCatalog,
pkSchema,
pkTable,
pkColumn,
pkType,
pkSize,
SelfJoin,
CASE
WHEN [Column] IS NULL THEN 0
ELSE 1
END
FROMdbo.fnTableTree(@Schema, @Table)

IF @@ROWCOUNT = 0
RETURN

DECLARE@SQL TABLE
(
ID INT IDENTITY(1, 1),
RowID INT PRIMARY KEY CLUSTERED,
IsSelfJoin TINYINT NOT NULL,
HasPk TINYINT NOT NULL,
[SQL] NVARCHAR(4000) NOT NULL
)

DECLARE@Indent SMALLINT,
@RowID INT,
@ID INT,
@TSQL NVARCHAR(4000),
@RowSQL NVARCHAR(4000),
@EndSQL NVARCHAR(4000),
@pkColumn NVARCHAR(128),
@IsSelfJoin TINYINT,
@HasPk TINYINT

DECLARE@Unwind TABLE
(
RowID INT NOT NULL,
StepID INT IDENTITY(0, 1) PRIMARY KEY NONCLUSTERED,
[SQL] NVARCHAR(4000)
)

WHILE NOT EXISTS (SELECT * FROM @SQL WHERE RowID = 1)
BEGIN
SELECT TOP 1@RowID = c.RowID,
@ID = c.RowID,
@Indent = c.Indent,
@TSQL = N'',
@EndSQL = N'',
@IsSelfJoin = c.IsSelfjoin,
@HasPk = c.HasPk
FROM@Constraints AS c
LEFT JOIN@SQL AS s ON s.RowID = c.RowID
WHEREs.RowID IS NULL
ORDER BYc.Indent DESC,
c.RowID DESC

WHILE @ID > 0
BEGIN
IF @Indent = 0
SELECT@RowSQL = N'DELETE t' + CAST(@RowID AS NVARCHAR(12)),
@RowSQL = @RowSQL + N' FROM ' + QUOTENAME(c.[Catalog]) + N'.' + QUOTENAME(c.[Schema]) + N'.' + QUOTENAME(c.[Table]) + N' AS t' + CAST(@ID AS NVARCHAR(12)),
@EndSQL = N' WHERE t' + CAST(@ID AS NVARCHAR(12)) + '.' + QUOTENAME(COALESCE(c.[Column], '%0')) + N' = ''%1''',
@IsSelfJoin = @IsSelfJoin | c.IsSelfJoin
FROM@Constraints AS c
WHEREc.RowID = @ID
ELSE
SELECT@RowSQL = N' INNER JOIN ' + QUOTENAME(c.[Catalog]) + N'.' + QUOTENAME(c.[Schema]) + N'.' + QUOTENAME(c.[Table]),
@RowSQL = @RowSQL + N' AS t' + CAST(@ID AS NVARCHAR(12)) + N' ON t' + CAST(@ID AS NVARCHAR(12)) + N'.' + QUOTENAME(c.[Column]),
@pkColumn = QUOTENAME(c.pkColumn),
@IsSelfJoin = @IsSelfJoin | c.IsSelfJoin
FROM@Constraints AS c
WHEREc.RowID = @ID

SELECT TOP 1@ID = c.RowID,
@Indent = c.Indent,
@RowSQL = @RowSQL + N' = t' + CAST(c.RowID AS NVARCHAR(12)) + N'.' + @pkColumn,
@IsSelfJoin = @IsSelfJoin | c.IsSelfJoin
FROM@Constraints AS c
WHEREc.RowID < @ID
AND c.Indent < @Indent
ORDER BYc.Indent DESC,
c.RowID DESC

IF @@ROWCOUNT = 0
SET@ID = 0

SET@TSQL = @RowSQL + @TSQL
END

INSERT@SQL
(
RowID,
IsSelfJoin,
HasPk,
[SQL]
)
VALUES(
@RowID,
@IsSelfJoin,
@HasPk,
@TSQL + @EndSQL
)

IF @IsSelfJoin = 1
BEGIN
DECLARE@Yak NVARCHAR(160),
@Catalog NVARCHAR(128),
@Column NVARCHAR(128)

SELECT@Yak = pkType + COALESCE('(' + CAST(pkSize AS NVARCHAR(12)) + ')', ''),
@Catalog = [Catalog],
@Schema = [Schema],
@Table = [Table],
@Column = [Column],
@Catalog = [Catalog],
@Table = [Table],
@pkColumn = pkColumn
FROM@Constraints
WHERERowID = @RowID

SET@RowSQL = 'DECLARE@Lvl INT
SET@Lvl = 0
DECLARE@Stage TABLE (RowID INT IDENTITY(0, 1), Lvl INT, RowKey ' + @Yak + ')
INSERT @Stage (Lvl, RowKey) '
+ REPLACE(@TSQL + @EndSQL, 'DELETE t' + CAST(@RowID AS NVARCHAR(12)) + '', 'SELECT 0, t' + CAST(@RowID AS NVARCHAR(12)) + '.' + QUOTENAME(@Column) + '')
+ ' WHILE @@ROWCOUNT > 0
BEGIN
SET@Lvl = @Lvl + 1

INSERT@Stage (Lvl, RowKey)
SELECT@Lvl,
t.' + QUOTENAME(@pkColumn) + '
FROM' + QUOTENAME(@Catalog) + '.' + QUOTENAME(@Schema) + '.' + QUOTENAME(@Table) + ' AS t
INNER JOIN@Stage AS s ON s.RowKey = t.' + QUOTENAME(@Column) + '
AND s.Lvl = @Lvl - 1
LEFT JOIN@Stage AS cr ON cr.RowKey = t.' + QUOTENAME(@pkColumn) + '
WHEREcr.RowKey IS NULL
END
SELECT ''DELETE FROM ' + QUOTENAME(@Catalog) + '.' + QUOTENAME(@Schema) + '.' + QUOTENAME(@Table) + ' WHERE ' + QUOTENAME(@pkColumn) + ' = '' + QUOTENAME(RowKey, '''''''')
FROM @Stage
WHERE RowID > 0
ORDER BY RowID DESC'

INSERT@Unwind
(
RowID,
[SQL]
)
VALUES(
@RowID,
@RowSQL
)
END
END

INSERT@Return
(
RowID,
IsSelfJoin,
HasPk,
[SQL]
)
SELECTs.ID,
s.IsSelfJoin,
s.HasPk,
CASE
WHEN u.RowID IS NULL THEN s.[SQL]
ELSE u.[SQL]
END
FROM@SQL AS s
LEFT JOIN@Unwind AS u ON u.RowID = s.RowID
ORDER BYs.ID,
u.StepID

RETURN
ENDE 12°55'05.25"
N 56°04'39.16"

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I have some questions regard subject above. I want to know the impact of replication process after SA pasword been changed.

Example: server1 (hq), server2 (district) & server3 (district).

If server1, SA password been changed, is it server2 & server3 need to change too?

may i know where is it the replication SA password stored? is it replication script refer ID (SA) from Security -> Logins?

I hope someone can help me.. thanks.

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Does ALTER COLUMN Effect The Data?

Aug 10, 2007

I just want to change the length of 2 fields. They're CHAR and NVARCHAR type. I want to change the length from 50 to 75.

Will doing this effect the data? Will it delete the data in those columns? I just want to make sure before I do anything. The table contains about 2.5 million rows, so I don't want to mess anything up. I'm aware that the script may take a while to run and finish, but I'm only concerned about data integrity.

Here is my example script syntax to show what I'm planning to do:




Code Snippet

alter table credit alter column writeoffreason char(75) not null;




Does it matter what type of data is in the columns? For now, it's only CHAR and NVARCHAR.

I also read somewhere that you can increase length but cannot decrease without repercussions?

Thanks!

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Allow Blank Value Does Not Effect When Parameter Is Multi Value = Bug!

Jan 3, 2008

I build reports using reporting services 2005 sp2.
I have 3 parameters---> 3 multi value combo box .
However when I tick "allow blank value" within the report parameter
properties for this drop menu, report WILL NOT run without making
selection.(The xml is ok allow blank value set to true)
the reports still require you to enter a value for all parameters in the report when the report can and should be able to be run with no parameter defined.
the trick "default values for all of the params to "=String.Empty"" is not good .


I found this article but i can't find microsoft hotfix for it .

http://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=125877


"Thank you for filing the bug. This issue has been fixed for the next CTP.
Posted by Microsoft on 8/11/2005 at 7:00 PM"

Am I missing something obvious here?

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Effect Of Update Statistics On Database And On An ASP Application

Jun 13, 2001

Hi

I had run a stored procedure in my server that update statistics against all user defined tables in my database (MSSQL 7.0).

Since then I am getting errors in my ASP application where I am reffering to adovbs.inc.

Here is an example of errors I get.

Microsoft VBScript runtime error '800a0411'

Name redefined: 'adOpenForwardOnly'

/Essai/adovbs.inc, line 14



Below is the stored procedure I have run against the database.

Can anybody help tank you guys.



CREATE PROCEDURE update_all_stats
AS
/*
This PROCEDURE will run UPDATE STATISTICS against
ALL user-defined tables within this database.
*/
DECLARE @tablename varchar(30)
DECLARE @tablename_header varchar(75)
DECLARE tnames_cursor CURSOR FOR SELECT name FROM sysobjects
WHERE type = 'U'
OPEN tnames_cursor
FETCH NEXT FROM tnames_cursor INTO @tablename
WHILE (@@fetch_status <> -1)


BEGIN
IF (@@fetch_status <> -2)


BEGIN
SELECT @tablename_header = "Updating " +
RTRIM(UPPER(@tablename))
PRINT @tablename_header
EXEC ("UPDATE STATISTICS " + @tablename )
END
FETCH NEXT FROM tnames_cursor INTO @tablename
END
PRINT " "
PRINT " "
SELECT @tablename_header = "************* NO MORE TABLES" +
" *************"
PRINT @tablename_header
PRINT " "
PRINT "Statistics have been updated FOR ALL tables."
DEALLOCATE tnames_cursor

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Need To Know Why Two Calculation Methods Result In Different Rounding Effect

Feb 23, 2004

Hi All,

I have a view that does some calculations on data in the database. Note in the two code snippets, that the columns being used in the calculations are all type FLOAT(53).

My confusion stems from the fact that both code snippets should be functionally the same in my "view" (*snicker* I kill me...), but they return different results which I think are related to rounding issues.

The first snippet:

CREATE VIEW dbo.VIEW_Calculate_PortfolioIndex
AS
SELECT PP.PortfolioID AS PortfolioID,
PP.CreateDate AS CreateDate,
(ROUND((PPI.CloseIndex + (PPI.CloseIndex * PP.DailyPerChg / 100.00)), 2) * PP.AvgHighPriceRatio) AS HighIndex,
CASE WHEN PPI.CloseIndex IS NULL
THEN 100.00
ELSE ROUND((PPI.CloseIndex + (PPI.CloseIndex * PP.DailyPerChg / 100.00)), 2)
END AS CloseIndex,
(ROUND((PPI.CloseIndex + (PPI.CloseIndex * PP.DailyPerChg / 100.00)), 2) * PP.AvgLowPriceRatio) AS LowIndex,
PP.Volume as Volume
FROM dbo.PortfolioIndex PPI INNER JOIN
dbo.PortfolioPerformance PP ON
PPI.PortfolioID = PP.PortfolioID AND
PPI.CreateDate = PP.PrevDate
GO

and it's result set:
PortfolioIDCreateDateHighIndexCloseIndexLowIndexVolume
102/20/2004781.11774.17769.53527896
112/20/2004757.97750.36742.93605740
122/20/2004509.92501.72494.854180516
132/20/2004988.23980.65973.58632337
142/20/20041283.261269.571259.37416145


And the second snippet:

CREATE VIEW dbo.VIEW_Calculate_PortfolioIndex
AS
SELECT PP.PortfolioID AS PortfolioID,
PP.CreateDate AS CreateDate,
(CloseIndex * PP.AvgHighPriceRatio) AS HighIndex,
CASE WHEN PPI.CloseIndex IS NULL
THEN 100.00
ELSE ROUND((PPI.CloseIndex + (PPI.CloseIndex * PP.DailyPerChg / 100.00)), 2)
END AS CloseIndex,
(CloseIndex * PP.AvgLowPriceRatio) AS LowIndex,
PP.Volume as Volume
FROM dbo.PortfolioIndex PPI INNER JOIN
dbo.PortfolioPerformance PP ON
PPI.PortfolioID = PP.PortfolioID AND
PPI.CreateDate = PP.PrevDate

which returns a different result set:
PortfolioIDCreateDateHighIndexCloseIndexLowIndexVolume
102/20/2004784.52774.17772.89527896
112/20/2004755.64750.36740.64605740
122/20/2004512.43501.72497.294180516
132/20/2004989.77980.65975.1632337
142/20/20041285.991269.571262.05416145


Specifically, I am concerned with the HighIndex and LowIndex values...since the only modification between the two code snippets is that in the second one, the HighIndex and LowIndex calculations use the column name of CloseIndex (as calculated in the select) in the calcs for those two columns, rather than repeating the code used to calculate the CloseIndex column's value.

I am confused as to why the results of the HighIndex and LowIndex caculations are different in the two selects, when the only change (in my view/expectations) is that one references the CloseIndex column, and the other one just reproduces the calculation itself

*scratching head*

any thoughts? Thanks,
Paul

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