Question

I have 2 tables table1 and table2, where table1 contains the data collected so far, and table2 contains table1‘s data along with some updated/additional data. I need to retrieve only this updated/additional data and insert it into table1.

Now I know I can use NOT IN to do this, but I am not sure it will be a very efficient solution in case of a huge number of records. Any suggestion on what the best approach would be in terms of execution speed?

Answer 1

This can be done with simple join both tables

something like below:

select t1.* from table1 as t1 join table2 as t2 on t1.id=t2.id where ...[]