SQL Server DISTINCT

Question

SELECT dbo.CLIENTREP.ref, dbo.REP2.ref 
    FROM dbo.CLIENTREP 
    FULL OUTER JOIN dbo.REP2 ON (dbo.REP2.ref = dbo.CLIENTREP.ref) 
    WHERE dbo.REP2.ref is null OR dbo.CLIENTREP.ref IS NULL; 

如何指定只返回DISTINCTdbo.CLIENTREP.ref和dbo.REP2.ref？

Answer 1

只要写SELECT DISTINCT ...

SELECT distinct dbo.CLIENTREP.ref, dbo.REP2.ref 
FROM dbo.CLIENTREP 
FULL OUTER JOIN dbo.REP2 ON (dbo.REP2.ref = dbo.CLIENTREP.ref) 
WHERE dbo.REP2.ref is null OR dbo.CLIENTREP.ref IS NULL;