SQL Passing Table Date for Date - db2

Question

Wondering how I can pass the RECEIVEDDATETIME to the statement below. What am I missing in my SQL statement?
I added an inner join to my CALENDAR table and TESTDATA table to pass the T.RECEIVEDDATETIME as the date from the original example thanks to Mark Barinstein.
This statement gets the C.WORKDATE from my tblCalendar, but I need to have the T.RECEIVEDDATETIME to pass to get my desired "DUEDATE".
I created a "tblCalendar" because I read that it was easier to reference a Calendar for true workdays...to exclude weekends and holidays and to account for leap years. Unsure if this is the best practice, but seemed straight forward to not code for exceptions. So I created the tblCalendar that includes ALL DATEs from 2017 until 2050 and holidays. The data below only represents partially January 2019 as I haven't found a way to attach a table here:
tblCalendar (partial)
DATE NUMDAYOFWK DAYOFWK HOLIDAY
01/01/2019 3 Tuesday YES
01/02/2019 4 Wednesday
01/03/2019 5 Thursday
01/04/2019 6 Friday
01/05/2019 7 Saturday
01/06/2019 1 Sunday
01/07/2019 2 Monday
01/08/2019 3 Tuesday
01/09/2019 4 Wednesday
01/10/2019 5 Thursday
01/11/2019 6 Friday
01/12/2019 7 Saturday
01/13/2019 1 Sunday
01/14/2019 2 Monday
01/15/2019 3 Tuesday
01/16/2019 4 Wednesday
01/17/2019 5 Thursday
01/18/2019 6 Friday
01/19/2019 7 Saturday
01/20/2019 1 Sunday
01/21/2019 2 Monday YES
The tblTestData table holds the core data where I reference all fields needed for my reports.
tblTestData Columns (partial) - DeliveryDays would reference the 2nd parameter BusDayAdd that was noted in the previous SQL.
ID RECEIVEDDATE DeliveryDays Address
T-20190116-255 01/16/2019 2 1234 Address
T-20190117-255 01/17/2019 2 3657 Address
T-20190118-222 01/18/2019 2 9999 Address
T-20190119-255 01/19/2019 2
T-20190120-255 01/20/2019
T-20190121-255 01/21/2019
T-20190303-1 03/03/2019
The Desired end results would look like the following taking into account the RECEIVEDDATETIME in my tblTestData and reference the tblCalendar table to exclude weekends and holidays to give the correct due date.
ID RECEIVEDDATE DeliveryDays DueDate Address
T-20190116-255 1/16/2019 2 1/18/2019 1234 Address
T-20190117-255 1/17/2019 2 1/22/2019 3657 Address
T-20190118-222 1/18/2019 2 1/23/2019 9999 Address
T-20190119-255 1/19/2019 2 1/23/2019 10000 Address
T-20190120-255 1/20/2019 2 1/23/2019 10001 Address
T-20190121-255 1/21/2019 2 1/23/2019 10002 Address
T-20190121-256 1/22/2019 2 1/24/2019 10003 Address
T-20190303-1 3/3/2019 3 3/6/2019 10004 Address
T-20190121-257 3/15/2019 7 3/26/2019 10005 Address
I have tried various statements by rewriting the code to wrap the SQL string to pass the table "RECEIVEDDATETIME", but each time the "DUEDATE" comes back {NULL}.
SELECT T.ID, VARCHAR_format(T.RECEIVEDDATETIME, 'MM/DD/YYYY') RECDATE,
(select VARCHAR_FORMAT(WORKDATE,'MM/DD/YYYY') DUEDATE
from
(Select
WORKDATE, T.RECEIVEDDATETIME,
sum(case when C.HOLIDAY='YES' or C.NUMDAYOFWK in (7,1) then 0 else 1 end) over (order by C.WORKDATE) BUSDAYADD
from tblCALENDAR C
--ADDED INNER JOIN TO GET T.RECEIVEDDATETIME TO FEED AUTOMATICALLY FROM TESTDATA TABLE
INNER JOIN TESTDATA T
ON
VARCHAR_FORMAT(C.WORKDATE, 'MM/DD/YYYY') = VARCHAR_FORMAT(T.RECEIVEDDATETIME,'MM/DD/YYYY')
where C.WORKDATE > VARCHAR_FORMAT(T.RECEIVEDDATETIME,'MM/DD/YYYY')) -- 1-st PARAMETER TO CAPTURE RECEIVEDDATETIME
WHERE BUSDAYADD = ? -- 2-nd parameter to add the number of days needed to be added to RECEIVEDDATETIME
order by WORKDATE --3rd Parameter
fetch first 1 row only)
FROM TESTDATA T
WHERE ID = 'T-20190303-1'
When I run the SQL, I get {NULL} for my results for DUEDATE:
ID RECDATE DUEDATE
T-20190303-1 03/03/2019 {NULL}
The results should be:
ID RECDATE DUEDATE
T-20190303-1 03/03/2019 03/05/2019
Any help is appreciated.

Answer 1

You provided inconsistent data in both tables: your calendar ends too early for all records in the tblTestData table except the 1-st one.
Let me provide absolutely the same query, which I already sent earlier to your another question.
with tblCalendar (DATE, HOLIDAY) as (values
(date(to_date('01/16/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/17/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/18/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/19/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/20/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/21/2019', 'MM/DD/YYYY')), 'YES')
, (date(to_date('01/22/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/23/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/24/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/25/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/26/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/27/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/28/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/29/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/30/2019', 'MM/DD/YYYY')), '')
, (date(to_date('01/31/2019', 'MM/DD/YYYY')), '')
, (date(to_date('02/01/2019', 'MM/DD/YYYY')), '')
, (date(to_date('02/02/2019', 'MM/DD/YYYY')), '')
, (date(to_date('02/03/2019', 'MM/DD/YYYY')), '')
, (date(to_date('02/04/2019', 'MM/DD/YYYY')), '')
, (date(to_date('02/05/2019', 'MM/DD/YYYY')), '')
)
, tblTestData (ID, RECEIVEDDATE, DeliveryDays) as (values
('T-20190116-255', date(to_date('01/16/2019', 'MM/DD/YYYY')), 2)
, ('T-20190117-255', date(to_date('01/17/2019', 'MM/DD/YYYY')), 2)
, ('T-20190118-222', date(to_date('01/18/2019', 'MM/DD/YYYY')), 2)
, ('T-20190119-255', date(to_date('01/19/2019', 'MM/DD/YYYY')), 2)
, ('T-20190120-255', date(to_date('01/20/2019', 'MM/DD/YYYY')), 2)
, ('T-20190121-255', date(to_date('01/21/2019', 'MM/DD/YYYY')), 2)
, ('T-20190121-256', date(to_date('01/22/2019', 'MM/DD/YYYY')), 2)
, ('T-20190303-1' , date(to_date('01/23/2019', 'MM/DD/YYYY')), 3)
, ('T-20190121-257', date(to_date('01/24/2019', 'MM/DD/YYYY')), 7)
)
select m.*, t.date as DUEDATE
--, dayofweek(date) as DAYOFWK, dayname(date) as DAY
from tblTestData m
, table
(
select date
from table
(
select
date
, sum(case when HOLIDAY='YES' or dayofweek(date) in (7,1) then 0 else 1 end) over (order by date) as dn_
from tblCalendar t
where t.date > m.RECEIVEDDATE
)
where dn_ = m.DeliveryDays
fetch first 1 row only
) t;
The result is:
ID RECEIVEDDATE DAYS DUEDATE
-------------- ------------ ---- ----------
T-20190116-255 2019-01-16 2 2019-01-18
T-20190117-255 2019-01-17 2 2019-01-22
T-20190118-222 2019-01-18 2 2019-01-23
T-20190119-255 2019-01-19 2 2019-01-23
T-20190120-255 2019-01-20 2 2019-01-23
T-20190121-255 2019-01-21 2 2019-01-23
T-20190121-256 2019-01-22 2 2019-01-24
T-20190303-1 2019-01-23 3 2019-01-28
T-20190121-257 2019-01-24 7 2019-02-04

Answer 2

The SELECT of the DUEDATE is
INNER JOIN TESTDATA T
ON VARCHAR_FORMAT(C.WORKDATE, 'MM/DD/YYYY') = VARCHAR_FORMAT(T.RECEIVEDDATETIME,'MM/DD/YYYY')
where C.WORKDATE > VARCHAR_FORMAT(T.RECEIVEDDATETIME,'MM/DD/YYYY'))
This means you join on the Equality and then restrict to Workdate > Receiveddatetime
that might be the problem...