How to update a certain field depending on the fetch cteTable - sql

Question

I want to replace the 1st and 2nd parameter in DATEADD function depending on the result of cteTable. Is this something possible? Do I need to create a parameter? Thank you in advance. Happy new year!
;with cteDP as(
SELECT CODE, MEASSUREMENT, DEFEXPIRYDATEDAYS,
CASE WHEN MEASSUREMENT = 0 THEN 'DAY'
WHEN MEASSUREMENT = 1 THEN 'WEEK'
WHEN MEASSUREMENT = 2 THEN 'MONTH'
WHEN MEASSUREMENT = 3 THEN 'YEARS'
ELSE 'SECOND'
END AS MEASUREMENTINWORD
FROM PW001C06 C06 WHERE CODE IN ('ADC','MMC')
)
select * from cteDP
UPDATE P05
SET P05.EXPIRYDATE = CASE
WHEN P05.CODE = 'ADC' THEN DATEADD('cteDocProperties.MEASUREMENTINWORD', #2nd parameter, EXPIRYDATE)
-- WHEN P05.CODE = 'MMC' THEN DATEADD(YEAR, 4, EXPIRYDATE)
-- WHEN P05.CODE = 'LD00' THEN DATEADD(YEAR, 3, EXPIRYDATE)
ELSE EXPIRYDATE
END
FROM PW001P05 P05
INNER JOIN cteDP
ON cteDP.CODE = P05.CODE
WHERE P05.PIN = 1
AND P05.CODE IN ('ADC','MMC')

Answer 1

You can directly JOIN to the table expression:
UPDATE P05
SET
P05.EXPIRYDATE = CASE
WHEN P05.CODE = 'ADC' THEN
CASE WHEN MEASUREMENTINWORD = 'SECOND'
THEN DATEADD(SECOND, MEASSUREMENT, EXPIRYDATE)
CASE WHEN MEASUREMENTINWORD = 'DAY'
THEN DATEADD(DAY, MEASSUREMENT, EXPIRYDATE)
CASE WHEN MEASUREMENTINWORD = 'MONTH'
THEN DATEADD(MONTH, MEASSUREMENT, EXPIRYDATE)
CASE WHEN MEASUREMENTINWORD = 'YEAR'
THEN DATEADD(YEAR, MEASSUREMENT, EXPIRYDATE)
ELSE EXPIRYDATE
END
FROM PW001P05 P05
INNER JOIN
(
SELECT
CODE
, MEASSUREMENT
, DEFEXPIRYDATEDAYS
, CASE
WHEN MEASSUREMENT = 0 THEN 'DAY'
WHEN MEASSUREMENT = 1 THEN 'WEEK'
WHEN MEASSUREMENT = 2 THEN 'MONTH'
WHEN MEASSUREMENT = 3 THEN 'YEARS'
ELSE 'SECOND'
END AS MEASUREMENTINWORD
FROM PW001C06 C06 WHERE CODE IN ('ADC','MMC')
) cteDP
ON cteDP.CODE = P05.CODE
WHERE P05.PIN = 1
AND P05.CODE IN ('ADC','MMC')