I have the following code for handling phone numbers such as country code for Australia +61
, 61
, 001161
etc. The problem that I have I can't insert any CASE
statement anymore under: CASE WHEN LEFT(@BPartyNo, 4) = '+610'
It said that Case expressions may only be nested to level 10
How do I streamline this TSQL so I can put more CASE?
USE [TelcoStage_PROD]
GO
/****** Object: UserDefinedFunction [dbo].[ufn_stg_ProperBPartyNoExtra] Script Date: 07/12/2010 15:27:52 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
--=====================================================================================================================
-- OBJECT NAME : dbo.ufn_stg_ProperBPartyNoExtra
-- INPUTS : @BPartyNo
-- OUTPUTS : VARCHAR(32)
-- RETURN CODES : N/A
-- DEPENDENCIES : N/A
-- DESCRIPTION : This function is used to get the extra after 10 character (MNET or S)
--
-- EXAMPLES (optional) : N/A
--
-- HISTORY:
-- #-----------------------------------------------------------------------------------------------------------------
-- # DATE | VERSION | MODIFIED BY | DESCRIPTION
-- #-----------------------------------------------------------------------------------------------------------------
====================================================================================================================
ALTER FUNCTION [dbo].[ufn_stg_ProperBPartyNoExtra](@BPartyNo AS VARCHAR(MAX))RETURNS VARCHAR(32)
AS
BEGIN
DECLARE @Return VARCHAR(32);
SET @Return = '';
IF (LEN(@BPartyNo) > 0)
SELECT @Return = CASE WHEN LEFT(@BPartyNo, 4) = '+610' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 5, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 5, LEN(@BPartyNo)) ) ) ELSE
CASE WHEN LEFT(@BPartyNo, 3) = '+61' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 4, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 4, LEN(@BPartyNo)) ) ) ELSE
CASE WHEN LEFT(@BPartyNo, 2) = '61' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 3, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 3, LEN(@BPartyNo)) ) ) ELSE
CASE WHEN LEFT(@BPartyNo, 6) = '001161' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 7, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 7, LEN(@BPartyNo)) ) ) ELSE
CASE WHEN ( LEFT(@BPartyNo,2) = '01' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo)) ELSE
CASE WHEN ( LEFT(@BPartyNo,2) = '02' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo)) ELSE
CASE WHEN ( LEFT(@BPartyNo,2) = '03' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo)) ELSE
CASE WHEN ( LEFT(@BPartyNo,2) = '04' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo)) ELSE
CASE WHEN ( LEFT(@BPartyNo,2) = '07' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo)) ELSE
CASE WHEN ( LEFT(@BPartyNo,2) = '08' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo)) ELSE '' END
END
END
END
END
END
END
END
END
END;
ELSE
SELECT @Return = '';
RETURN @Return
END
CASE statements can be nested just as IF statements can.
There are two types of CASE expressions: simple and searched. In simple CASE expressions, an expression is compared with a value. When a match is found, the specified action in the THEN clause is applied. If no match is found, the action in the ELSE clause is applied.
A CASE expression is very similar in form to a CASE statement and allows you to choose which of one or more expressions to evaluate. The result of a CASE expression is a single value, whereas the result of a CASE statement is the execution of a sequence of PL/SQL statements.
They don't need to be nested at all:
SELECT @Return = CASE WHEN LEFT(@BPartyNo, 4) = '+610' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 5, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 5, LEN(@BPartyNo)) ) )
WHEN LEFT(@BPartyNo, 3) = '+61' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 4, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 4, LEN(@BPartyNo)) ) )
WHEN LEFT(@BPartyNo, 2) = '61' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 3, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 3, LEN(@BPartyNo)) ) )
WHEN LEFT(@BPartyNo, 6) = '001161' THEN SUBSTRING('0' + SUBSTRING(@BPartyNo, 7, LEN(@BPartyNo)), 11, LEN( '0' + SUBSTRING(@BPartyNo, 7, LEN(@BPartyNo)) ) )
WHEN ( LEFT(@BPartyNo,2) = '01' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo))
WHEN ( LEFT(@BPartyNo,2) = '02' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo))
WHEN ( LEFT(@BPartyNo,2) = '03' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo))
WHEN ( LEFT(@BPartyNo,2) = '04' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo))
WHEN ( LEFT(@BPartyNo,2) = '07' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo))
WHEN ( LEFT(@BPartyNo,2) = '08' AND LEN(@BPartyNo) > 10 ) THEN SUBSTRING(@BPartyNo, 11, LEN(@BPartyNo))
ELSE ''
END
Personally, I would restructure your code so that you make sure the data in sanitized upon input, rather than trying to sanitize it now (when it's clearly too late...). Or at least do the conversion in your client language (i.e. in whatever is calling this sproc), which is hopefully more suited to the task of string manipulation than T-SQL is.
I had written 12 nested IIF statements for a view which errored as a Nested Case Error. I was taking 12 columns (Jan - Dec) which held numeric values. The view was to convert each month to a row. I then realized I could split the nested IIFs into two groups of six, and add them together! It worked!
select AP.Year, AP.Period, RPA.Company, RPA.Contract, RPA.Description, RPA.PM, RPA.ProjectManager,
IIF(AP.Period=1, RPA.JanNetBilled, IIF(AP.Period=2, RPA.FebNetBilled, IIF(AP.Period=3, RPA.MarNetBilled, IIF(AP.Period=4, RPA.AprNetBilled, IIF(AP.Period=5, RPA.MayNetBilled,
IIF(AP.Period=6, RPA.JunNetBilled, 0)))))) +
IIF(AP.Period=7, RPA.JulNetBilled, IIF(AP.Period=8, RPA.AugNetBilled, IIF(AP.Period=9, RPA.SepNetBilled, IIF(AP.Period=10, RPA.OctNetBilled,
IIF(AP.Period=11, RPA.NovNetBilled, IIF(AP.Period=12, RPA.DecNetBilled, 0)))))) as BilledAmt
from AccountPeriod AP
INNER JOIN REVENUE_PROJECTION_ANALYSIS RPA ON RPA.YEAR = AP.Year
You don't need to nest the case statements, you can have many WHEN ... THEN
CASE
WHEN @x = 1 THEN 1
WHEN @x = 2 THEN 2
WHEN @x = 3 THEN 3
ELSE 4
END
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