Home/ Questions/Q 4556502
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-21T17:22:30+00:00

I have a question about running a particular type of query. Here’s the example:

  • 0

I have a question about running a particular type of query.
Here’s the example: I have 2 tables X and Y

Table X
1@abc.com
2@abc.com
3@abc.com

I now want to move EVERYTHING into table Y.
So now, Table Y looks just like Table X

I now delete everything from Table X, except for 1@abc.com
So the new Table X looks like this:

Table X
1@abc.com

Let’s say that I did this accidentally and I now want to move everything from Table Y back into X except for matching records (which, in this case, would 1@abc.com)

How would I go about this?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Something close to the below ought to do it. Watch for NULLs, though – you’ll need to ensure that the conditions on the LEFT JOIN cope with these.

    INSERT INTO X
SELECT *
FROM Y
LEFT JOIN X
ON X.field1 = Y.field1
AND X.field2 = Y.field2
AND ...
WHERE X.field1 IS NULL
    • 0