How to insert Distinct Records from Table A to Table B (both tables have same structure)

Question

I want to insert only Distinct Records from Table \"A\" to Table \"B\". Assume both the tables has same structure.

Answer 1

If by DISTINCT you mean unique records that are on TableB that aren't already in TableA, then do the following:

INSERT INTO TableB(Col1, Col2, Col3, ... , Coln)
SELECT DISTINCT A.Col1, A.Col2, A.Col3, ... , A.Coln
FROM TableA A
LEFT JOIN TableB B
ON A.KeyOfTableA = B.KeyOfTableB
WHERE B.KeyOfTableB IS NULL