Functions in Access not supported in SQL
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I'm working on a project converting an Access DB to SQL.
The Access DB contains a lot of crosstab queries which aren't supported in SQL which can be replaced with a stored procedure, and a lot of queries that use the Iif function which also isn't supported.
If I'm seeing a function that looks something like Sum(IIF(blah blah, blah blah, blah blah)/Sum(IIF(etc..... how on EARTH do I convert that using SELECT/CASE?
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iif in Access is CASE in T SQL e.g.
iif([field1]<29,x,y) becomes
- CASE [field1]
- WHEN <29 THEN x
- ELSE y
- END
When you have multiple (or nested conditions) then the CASE method looks a lot neater e.g.
iif([field1]<22, a,iif([field1]<30,b,iif([field1]<40,c ....
becomes
- CASE
- WHEN [field1]<22 THEN a
- WHEN [field1]>=22 AND [field1]<30 THEN b
- etc
Your example would be something like
- SELECT
- SUM (CASE [field1]
- WHEN <29 THEN x
- ELSE y
- END) /
- SUM(CASE [field2]
- WHEN <45 THEN b
- ELSE c
- END)
- FROM
- table1
Hope that helps.
-
Thanks, I'll give that a try.
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Why don't you look into Report Services they use a format called Matrix to satify the Pivot Logic.
we created a pivot table stored Procedure as follows :
Hope this helps
/*
Pivot Table stored procedure
Description:
Generates simple pivot tables on data, and outputs the final SQL statement via Print
For example, given data as shown below:
ID year type amt
----------- ----------- ----------- -----------
7 1999 1 23
8 1999 2 44
9 1999 3 55
10 2000 1 66
11 2000 2 77
12 2000 3 88
13 1999 1 11
... you can pivot the data to show the years down the side
and the types across the top...
year 1 2 3 RowTotal
----------- ----------- ----------- ----------- -----------
1999 34 44 55 133
2000 66 77 88 231
... and get the SQL which would produce this table
SELECT Pivot_Data.*,
(Pivot_Data.[1] + Pivot_Data.[2] + Pivot_Data.[3]) AS RowTotal
FROM (SELECT [year],
SUM(CASE [type] WHEN '1' THEN [amt] ELSE 0 END) AS [1],
SUM(CASE [type] WHEN '2' THEN [amt] ELSE 0 END) AS [2],
SUM(CASE [type] WHEN '3' THEN [amt] ELSE 0 END) AS [3]
FROM (select * from zzjunk) AS Base_Data
GROUP BY [year]) AS Pivot_Data
.. by calling the procedure as shown below:
exec sp_Query_Pivot 'select * from zzjunk', '[year]', '[type]',
'Select distinct [type] from zzjunk', 'SUM', '[amt]', 'Y'
-- Base_Data_SQL gets all data from zzjunk
-- group by year
-- use the type column as headings
-- get the list of types available from the junk table,
-- use 'SUM' at each cell
-- sum the '[amt]' column
-- include a summary for the row
Example 2:
sp_Query_Pivot 'select * from fin_ben_allocation as fba inner join bmo_group as bg
on fba.beneficiary_id = bg.bmo_group_id',
'[eng_id]', '[bmo_group_desc_short]',
'Select bmo_group_desc FROM bmo_group', 'SUM', '[avoidance_pct]', 'Y'
Returns:
eng_id PCCG E! PCG IBG Corp RowTotal
----------- ---------------------------------------- -----
1 1 34 0 0 0 35
2 100 0 34 24 12 170
Arguments:
Base_Data_SQL SQL that returns data to be summarized
Row_Headings Comma-separated list of rows to use as groupings of data
Column_Heading Column to use as heading
Column_Head_SQL SQL that returns set of possible column headings
Operation SUM, PRODUCT, etc
Op_Argument Column to use as argument in operation
Steps in Routine:
1. Get list of distinct column headings
2. Looping through column headings, ALTER SQL for pivot
3. Add summary SQL if required
4. Execute
History:
Jeff Zohrab Aug 13, 2001 Initial release
*/
CREATE Procedure Take2.sp_Query_Pivot2
@Base_Data_SQL varchar(6000), -- Table to use as recordsource to build final crosstab qry
@Row_Headings varchar(1200), -- Comma-separated list of rows to use as groupings of data
@Column_Heading varchar(1200), -- Column to use as heading
@Column_Head_SQL varchar(2000), -- SQL that returns set of possible column headings
@Operation varchar(10), -- SUM, PRODUCT, etc
@Op_Argument varchar(200), -- Column to use as argument in operation
@Add_Row_Summary char(1) -- 'Y' to include summary, 'N' to omit
AS
set nocount on
Declare @sql varchar(8000),
@Summary_SQL varchar(8000) -- to summarize each row
SET @sql = 'SELECT ' + @Row_Headings + ', '
Set @Summary_SQL = ''
-- Get list of distinct column headings
CREATE TABLE #Col_Heads
(
Col_ID int identity(1,1),
Col_Head varchar(200) NULL
 
Exec ('INSERT INTO #Col_Heads(Col_Head) ' + @Column_Head_SQL)
-- select * from #Col_Heads -- debug check
-- loop through all columns, build pivot strings
DECLARE @Col_ID_Curr int, -- column being checked
@Col_ID_Old int,
@Curr_Col_Head varchar(8000),
@Pivot_SQL varchar(8000) -- pivot SQL for current column
SELECT TOP 1 @Col_ID_Curr = Col_ID, @Curr_Col_Head = Col_Head
FROM #Col_Heads ORDER BY Col_ID
IF (@Col_ID_Curr IS NOT NULL )
BEGIN
-- dummy value to enter loop
Set @Col_ID_Old = @Col_ID_Curr - 1
WHILE (@Col_ID_Old <> @Col_ID_Curr)
BEGIN
-- print 'Adding pivot line for heading ' + @Curr_Col_Head -- debug check
Set @Pivot_SQL = char(13) + @Operation
+ '(CASE ' + @Column_Heading
+ ' WHEN ''' + @Curr_Col_Head + ''' THEN ' + @Op_Argument
+ ' ELSE 0 END) AS [' + @Curr_Col_Head +']'
Set @sql = @sql + ' ' + @Pivot_SQL
-- Add column name to summary list, if required
If (@Add_Row_Summary='Y')
Set @Summary_SQL = @Summary_SQL + 'Pivot_Data.[' + @Curr_Col_Head +']'
-- Get the next column head
-- if there are no more Col_Heads in the table, the select returns
-- no records, and Col_ID_Curr doesn't change (exits the while loop)
Set @Col_ID_Old = @Col_ID_Curr
SELECT TOP 1 @Col_ID_Curr = Col_ID, @Curr_Col_Head = Col_Head
FROM #Col_Heads
WHERE Col_ID > @Col_ID_Curr
ORDER BY Col_ID
-- Add delimiters to lists if this isn't the last column heading
IF (@Col_ID_Old <> @Col_ID_Curr)
Begin
Set @Summary_SQL = @Summary_SQL + ' + '
End
END
END
--select * from #Col_Heads
Declare @TotalCnt tinyint
Declare @ctr tinyint
Declare @StartColCount Tinyint
Declare @EndColCount Tinyint
set @TotalCnt=0
select @TotalCnt=count(*) from #Col_Heads
while @Totalcnt <= 12
Begin
set @Totalcnt=@Totalcnt - 12 --Get the number of balance columns
End
-- release objects
DROP TABLE #Col_Heads
-- Finish SQL
Set @sql = @sql + char(13) + ' FROM (' + @Base_Data_SQL + ') AS Base_Data '
+ char(13) + 'GROUP BY ' + @Row_Headings
-- If summary requested, add enclosing Summary SQL
If (@Add_Row_Summary='Y')
Begin
Set @sql = 'SELECT Pivot_Data.*, ' + char(13)
+ ' (' + @Summary_SQL + ') AS RowTotal ' + char(13)
+ ' FROM (' + @sql + ') AS Pivot_Data'
End
print @sql
--select * from #Temp
-- Done
--Print @sql
Exec (@SQL)
GO
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