Question:Which of the following statements using GROUP BY clause are allowed in SQL Server 2008?
A SELECT Column1 + Column2 FROM Table GROUP BY Column1, Column2
B SELECT Column1, Column2 FROM Table GROUP BY Column1 + Column2
C SELECT Column1 + constant + Column2 FROM Table GROUP BY Column1 + Column2
D SELECT Column1 + Column2 FROM Table GROUP BY Column1 + Column2
+ AnswerA B D
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