Which two are true about a SQL statement using SET operators such as UNION?

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Which two are true about a SQL statement using SET operators such as UNION?

A.The data type of each column returned by the second query must exactly match the data type of
The corresponding column returned by the first query
B.The  number,  but  not  names,  of  columns  must  be  identical  for  all  SELECT  statements  in  the
Uery
C.The names and number of columns must be identical for all SELECT statements in the query
D.The  data  type  of  each  column  returned  by  the  second  query  is  automatically  converted  to  the
Data
Type of the corresponding column returned by the first query
E.The data type group of each column returned by the second query must match the data type
Group of the corresponding column returned by the first query
正确答案BE
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