Re: SQL update column join on same table

The MERGE will work with the Source and Target being the same table. I
think it is working.
Kerwin

On Thu, Jul 25, 2024 at 7:43 AM K Crawford <kscx3ksc@xxxxxxxxx> wrote:

It is the same table.
I guess I could copy the table and make two of them.

On Wed, Jul 24, 2024 at 9:14 PM Javier Sanchez <
javiersanchezbarquero@xxxxxxxxx> wrote:

Then WHEN NOT MATCHED clause is wrong, sorry for that, it should be WHEN
MATCHED, since the STATUS field has to be different to get a MATCH.



El mié, 24 jul 2024 a las 20:06, Javier Sanchez (<
javiersanchezbarquero@xxxxxxxxx>) escribió:

Your example is a bit confusing because you are using the same table

and

not your dependent ones.

https://www.ibm.com/docs/en/i/7.4?topic=language-merging-data

This link above gives you, not exactly what you want but the idea is

there

for the update.

In a approach to your code, that shouldn't work, UNLESS table B is

another

table in another library, I would rewrite your sql above like this:

MERGE INTO MYLIB.MYTABLE AS A USING MYLIB.MYTABLE AS B
on a.mbrid = b.mbrid and a.key1 = b.key1 and a.startdate = b.startdate

and

a.enddate = b.enddate AND A.STATUS <> B.STATUS
WHEN NOT MATCHED THEN
UPDATE SET A.STATUS = B.STATUS
ELSE IGNORE;

The idea above is that table B must be different from table A to work
correctly. Try this code with the idea you've got in mind, and should

work.

HTH
JS




El mié, 24 jul 2024 a las 12:44, K Crawford (<kscx3ksc@xxxxxxxxx>)
escribió:

I have a table that has an employee dependent relationship.
Table columns:
MbrID
key1
isDependent
StartDate
EndDate
Status
Name

Example Data:
123 blue N 01/01/2023 12/31/2023 E Sam Smith
123 blue N 01/01/2024 12/31/2024 X Sam Smith
123 blue Y 01/01/2023 12/31/2023 Olivia Smith
123 blue Y 01/01/2024 12/31/2024 Olivia Smith
789 blue N 01/01/2023 12/31/2023 E Ken Jones
789 red N 01/01/2024 12/31/2024 X Ken Jones
789 blue Y 01/01/2023 12/31/2023 Bob Jones
789 red Y 01/01/2024 12/31/2024 Bob Jones

I need to update the dependents with the related employee status.

end

result looking like.
Example Date after update:
123 blue N 01/01/2023 12/31/2023 E Sam Smith
123 blue N 01/01/2024 12/31/2024 X Sam Smith
123 blue Y 01/01/2023 12/31/2023 E Olivia Smith
123 blue Y 01/01/2024 12/31/2024 X Olivia Smith
789 blue N 01/01/2023 12/31/2023 E Ken Jones
789 red N 01/01/2024 12/31/2024 X Ken Jones
789 blue Y 01/01/2023 12/31/2023 E Bob Jones
789 red Y 01/01/2024 12/31/2024 X Bob Jones

I have an sql that looks like it will join the rows together.
select a.mbrid, b.mbrid, a.key1, b.key1, a.isdependent,

b.isdependent,

a.status, b.status, a.startdate, b.startdate, a.enddate,

b.enddate,

a.name, b.name
from myLib.myTable a
*left* join myLib.myTable b
on a.mbrid = b.mbrid and a.key1 = b.key1 and a.startdate =

b.startdate

and

a.enddate = b.enddate

Can I get it to do the update to the dependent status column in the

same

SQL?
Do I need to do some sort of CTE?

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