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CREATE TABLE #test
(
  ID        INTEGER,
  Surname   VARCHAR(50),
  Given1    VARCHAR(30)
)
SELECT * FROM #test WHERE Surname = 'rose' 
–- this will work as we are not comparing with data from a table in the current database
 
-- however if we try
SELECT * FROM #test WHERE Surname IN (SELECT Surname FROM community)
-- this causes a collation conflict as we are comparing string values across databases with different collation sequences