(ZANNUAL/12-(ZANNUAL-ZTAXBAND)/12)*ZRATE/100 as ZMAXTAX ZERO for first record

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SQL-Server-2008R2

INSERT INTO #SRESULTS(ZZBAND,ZZTAXBAND,ZZRATE,ZZANNUAL,ZZMONTHLY,ZZMAXTAX)
SELECT DISTINCT ZBAND,
ZTAXBAND,
ZRATE,
ZANNUAL,
ZANNUAL/12 AS ZMONTHLY,
(ZANNUAL/12-(ZANNUAL-ZTAXBAND)/12)*ZRATE/100 AS ZMAXTAX
FROM #FRESULTS

---------------------------------------------------------------------------------------------------------

1. Want the first record computation of the undernoted 'ZMAXTAX' to equal ZERO how do I achieve it.

(ZANNUAL/12-(ZANNUAL-ZTAXBAND)/12)*ZRATE/100 AS ZMAXTAX

What I have tried:

This is an ongoing Select statement challenge

Posted 29-Jul-19 0:10am

Member 12770648

Updated 3-Aug-19 7:08am

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OriginalGriff 29-Jul-19 6:51am

And?
What have you tried?
Where are you stuck?
What help do you need?

Wendelius 29-Jul-19 7:19am

How do you define the first record? First based on what?

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CHill60 · Answer 1 · 2019-08-03T07:08:00

As @Wendelius has pointed out, there is no concept of a "first record" unless you have some means of identifying the ORDER in which the records should be interpreted.

As you have no obvious auto-increment, nor a definition of "first" I have assumed that the records will appear in ZBAND + ZTAXBAND order to generate a row number. I can then use that row number in a CASE statement similar to this

SQL

;WITH CTE AS
 (
	SELECT DISTINCT ROW_NUMBER() OVER (ORDER BY ZBAND, ZTAXBAND) AS RN,
	ZBAND,
	ZTAXBAND,
	ZRATE,
	ZANNUAL,
	ZANNUAL/12 AS ZMONTHLY,
	(ZANNUAL/12-(ZANNUAL-ZTAXBAND)/12)*ZRATE/100 AS ZMAXTAX 
	FROM #FRESULTS 
)
INSERT INTO #SRESULTS(ZZBAND,ZZTAXBAND,ZZRATE,ZZANNUAL,ZZMONTHLY,ZZMAXTAX)
SELECT 
	ZBAND,
	ZTAXBAND,
	ZRATE,
	ZANNUAL,
	ZANNUAL/12 AS ZMONTHLY,
	CASE WHEN RN = 1 THEN 0 ELSE (ZANNUAL/12-(ZANNUAL-ZTAXBAND)/12)*ZRATE/100 END AS ZMAXTAX 
	FROM CTE