creating an iterative loop in a temporary table where there is no ue Primary Key only a candidate key
I have a temporary table that I need to loop through in a function.
A snapshot of the data in the temporary table reveals the following:
@WasteStream
All the loop examples I have found on the internet so far have been simple examples that rely on using the primary key from a table as the cursor for the loop. In this case that isn't applicable.
As you can see there is no unique primary key that is going to be of any use, only a candidate key made up of SiteId and Description.
What I need is a loop that will loop through each INDIVIDUAL record in the temporary table and allow me to do the rather complicated processing required for each one (and believe me there is a lot of processing required for each one, hence the loop based solution rather than a set based solution).
Help would be much appreciated.
A snapshot of the data in the temporary table reveals the following:
@WasteStream
HeadId AreaId BranchId SiteId Description
11 12 16 8 Metal - Brass
11 12 16 8 Metal - Bronze
11 12 16 8 Metal - Contaminated
11 12 16 8 Metal - Copper
11 12 16 8 Metal - Iron
11 12 16 9 Metal - Brass
11 12 16 9 Metal - Bronze
11 12 16 9 Metal - Contaminated
11 12 16 9 Metal - Copper
11 12 16 9 Metal - Iron
11 12 16 10 Metal - Brass
11 12 16 10 Metal - Bronze
11 12 16 10 Metal - Contaminated
11 12 16 10 Metal - Copper
11 12 16 10 Metal - Iron
All the loop examples I have found on the internet so far have been simple examples that rely on using the primary key from a table as the cursor for the loop. In this case that isn't applicable.
As you can see there is no unique primary key that is going to be of any use, only a candidate key made up of SiteId and Description.
What I need is a loop that will loop through each INDIVIDUAL record in the temporary table and allow me to do the rather complicated processing required for each one (and believe me there is a lot of processing required for each one, hence the loop based solution rather than a set based solution).
Help would be much appreciated.
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1. Insert data into temp table with an identifier, (alternatively you could add an identity column to the current table too).
SELECT ROW_NUMBER() OVER(ORDER BY DESCRIPTION) RowID,
HeadId,
AreaId,
BranchId,
SiteId,
Description
INTO #NEW_TEMP_TABLE
2. Loop through the data (I am not a fan of CURSORS, this method is MUCH faster)
Declare @CurrenRowtID int
Declare @LastRowtID int
SELECT @CurrenRowtID = 0
SELECT @LastRowtID = Max(RowID)
FROM #NEW_TEMP_TABLE
SELECT Top 1 @CurrenRowtID = RowID
FROM #NEW_TEMP_TABLE
WHERE RowID > @CurrenRowtID
ORDER BY RowID
WHILE @CurrenRowtID <= @LastRowtID
BEGIN
-- Do your work Here
SELECT Top 1 @CurrenRowtID = RowID
FROM #NEW_TEMP_TABLE
WHERE RowID > @CurrenRowtID
ORDER BY RowID
END