COLUMN NAME PRIMARY_KY PRIRTY_NO CLUST_ID_SK

DATA IN SOURCE 1 NULL -99

DATA IN TARGET 1 102 NULL

Regarding to this:

COLUMN NAME 	PRIMARY_KY 	PRIRTY_NO 	CLUST_ID_SK
		
DATA IN SOURCE 		1 	NULL 		-99

DATA IN TARGET 		2 	102 		NULL

If the primary key is not the same, then you are comparing two different records.

I have an SCD type 2 table RDM_ACTIVITY_FACT in oracle database which is having both Partition and Sub partition. There are 132 columns in this table. I have created a new SCD type 1 table RDM_ACTIVITY_FACT_MIG with the same partition and sub partition and this table contains 99 columns.

Now I am migrating data from SCD type 2 to SCD type 1 table partition wise.
For e g:
If SCD type 2 table has partition JAN_2003 then I am migrating as below

Insert into RDM_ACTIVITY_FACT_MIG Partition (JAN_2003)
Select Columns from RDM_ACTIVITY_FACT Partition (JAN_2003) where CURR_RECRD_FLG=’Y’

I am giving the filter CURR_RECRD_FLG=’Y’ in the Source so that only latest Record is inserted into SCD type 1 fact.

While migrating like this, I am facing issue like some data is getting missed or wrongly fetched. The same record if I fetch by the table Primary Key then I am not facing the issue.

COLUMN NAME PRIMARY_KY PRIRTY_NO CLUST_ID_SK

DATA IN SOURCE 1 NULL -99

DATA IN TARGET 2 102 NULL

I have given a scenerio above how my data looks in Source tabel and the target table.

PRIMARY_KY — Primary key column
PRIRTY_NO and CLUST_ID_SK are 2 columns

PRIRTY_NO is NULL data in source but while migrating, some value 102 is inserted into target table. Similarly CLUST_ID_SK is -99 in source but it inserts as a NULL in target.

When i insert these 2 records with the help of Primary key, then correct value is getting migrated

What tool are you using to query the table ? is it SQL*Plus ? Sql Developer ? other ?
What database version are you working on ?
What is the data type of the column ?
Can you post your queries ?

Thanks,