Data transfer from MySQL to Oracle Urgent!

Question

Hi All,
We have a table in MySQL database and we need to transfer a subset of its data over to Oracle table. The table in MySQL is big, so we created a temp table trying to do it several times. The question is, we set the the primary key column in both MySQL temp table and Oracle table ( a varchar column), when we transfered the data over using "insert into table_name select * from table_name@hsdobc", Oracle always gave the "Null value for not Null column" error, and it's only existed for one row no matter how many rows we want to transfer, but MySQL temp table has no such null value for the primary key column, it's very strange. Anyone knows what the problem might be? Thanks very much in advance.

Answer 1

Hi, thanks for your answer. I checked the MySQL table again, and found that in both the original table and the temp table, there is a row with the primary key column value "null". Don't know what happened? Probably it's a MySQL bug.
It's not Primary Key NULL value. If your new Oracle Table has ANY column defined
NOT NULL and while inserting you have at least one value in one row of coming data is NULL - It will fail. You need either to drop NOT NULL constraint for that
column(s), or provide value for it.
Also you can drop that NOT NULL constraint, Insert your data as is,
Update your data to get rid off all NULLs and put NOT NULL constraint back on.
ALTER TABLE MY_NEW_TABLE MODIFY MY_NEW_COLUMN NULL;
UPDATE MY_NEW_TABLE SET MY_NEW_COLUMN = 'Some_Value';
ALTER TABLE MY_NEW_TABLE MODIFY MY_NEW_COLUMN NOT NULL;