Question

Looking for an SQL Query to do the following:

1. insert all values of column x of table1 to column y of table2 if
   they don’t exist in table2
2. delete records from column table2 if the value of clumn y doesn’t exist anymore in
   column x of table1

I tried insert or ignore for the insert query with no luck in sql server 2008 R2

Answer 1

Sounds like a perfect fit for an SQL Server MERGE;

MERGE table2 AS t2
USING table1 AS t1
ON (t2.y = t1.x)
WHEN NOT MATCHED BY TARGET 
  THEN INSERT (y) VALUES(t1.x)
WHEN NOT MATCHED BY SOURCE
  THEN DELETE;

An SQLfiddle to test with.