SQL can only convert a valid character representation of a date or timestamp, or a numeric value which is the calculated number of days since '0001-01-01' into a real date.
The easiest way to convert numeric dates would be something like this
Here are 3 versions of how to convert numeric dates into a real date.
With x (Y, M, D, NumDate)
as (Values(Dec(2023 , 4, 0), Dec(9, 2, 0), Dec(5, 2, 0), Dec(20230509, 8, 0)),
(Dec(2022 , 4, 0), Dec(12, 2, 0), Dec(31, 2, 0), Dec(20221231, 8, 0)))
Select x.*, Date(Right(Digits(Y*10000000000 + M*100000000 + D * 1000000), 14)) CalcDate,
Date(Digits(y) concat Digits(m) concat Digits(d) concat '000000') CharDate,
Date(Digits(NumDate) concat '000000') DateYMD
from x;
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
Modernization – Education – Consulting on IBM i
IBM Champion since 2020
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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Dave
Sent: Tuesday, 5 September 2023 16:43
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: SQL dates and numeric columns
I'm surprised it's still so difficult to get a date from a numeric value Concat gives me this horrendous code :
date(
concat(
concat(
concat(trim(char(Y)), '-'), concat(trim(char(M)), '-')
)
, trim(char(D)))) " MyDate "
I would have liked to have been able to use
Y* 10000 + M* 100 + J
---------- message ---------
From: Dave <>
Date: Fri, 1 Sept 2023 at 10:40
Subject: SQL dates and numeric columns
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Hi,
Trying to do date operations on a physical file where the date is coded in
3 different numeric fields Y, M and D
1 - I created a view, can I do better than this :
date(trim(char(Y))!!'-'!!trim(char(M))!!'-'!!trim(char(D))) "MyDate"
?
2 – This works in an SQL session but the RPG compiler doesn’t seem to like the ‘ !’ character. Any ideas ?
Thanks
--
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