SQL script to partition data on a column and return the max value [duplicate] - sql

Question

This question already has answers here:
How to group by on consecutive values in SQL
(2 answers)
Closed 6 years ago.
I have a requirement to compute bonus payout based on spread goal and date achieved as follows:
Spread Goal | Date Achieved | Bonus Payout
----------------------------------------------
$3,500 | < 27 wks | $2,000
$3,500 | 27 wks to 34 wks | $1,000
$3,500 | > 34 wks | $0
I have a table in SQL Server 2014 where the subset of the data is as follows:
EMP_ID WK_NUM NET_SPRD_LCL
123 10 0
123 11 1500
123 15 3600
123 18 3800
123 19 4000
Based on the requirement, I need to look for records where NET_SPRD_LCL is greater than or equal to 3500 during 2 continuous wk_num.
So, in my example, WK_NUM 15 and 18 (which in my case are continuous because I have a calendar table that I join to to exclude the holiday weeks) are less than 27 wks and have NET_SPRD_LCL > 3500.
For this case, I want to output the MAX(WK_NUM), it's associated NET_SPRD_LCL and BONUSPAYOUT = 2000. So, the output should be as follows:
EMP_ID WK_NUM NET_SPRD_LCL BONUSPAYOUT
123 18 3800 2000
If this meets the first requirement, the script should output and quit. If not, then I will look for the second requirement where Date Achieved is between 27 wks to 34 wks.
I hope I was able to explain my requirement clearly :-)
Thanks for the help.

Answer 1

Nice question! I broke my mind on situations like 4 rows in a turn are with 3500 and more. And came up with this.
You can use CTE, recursive CTE and ROW_NUMBER():
;WITH cte AS(
SELECT EMP_ID,
WK_NUM,
NET_SPRD_LCL,
ROW_NUMBER() OVER (PARTITION BY EMP_ID ORDER BY WK_NUM) rn
FROM YourTable
)
, recur AS (
SELECT EMP_ID,
WK_NUM,
NET_SPRD_LCL,
rn,
1 as lev
FROM cte
WHERE rn = 1
UNION ALL
SELECT c.EMP_ID,
c.WK_NUM,
c.NET_SPRD_LCL,
c.rn,
CASE WHEN c.NET_SPRD_LCL < 3500 THEN Lev+1 ELSE Lev END
FROM cte c
INNER JOIN recur r
ON r.rn+1 = c.rn
)
SELECT TOP 1 WITH TIES
EMP_ID,
WK_NUM,
NET_SPRD_LCL,
CASE WHEN WK_NUM < 27 THEN $2000
WHEN WK_NUM between 27 and 34 THEN $1000
ELSE $0 END as Bonus
FROM recur
WHERE NET_SPRD_LCL >= 3500
ORDER BY ROW_NUMBER() OVER(PARTITION BY EMP_ID,lev ORDER BY WK_NUM)%2
Output for data you provided:
EMP_ID WK_NUM NET_SPRD_LCL Bonus
123 18 3800 2000,00