OCP 1Z0 051 QUESTION NO: 27
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QUESTION NO: 27
Which statement is true regarding the UNION operator?
A. The number of columns selected in all SELECT statements need to be the same
B. Names of all columns must be identical across all SELECT statements
C. By default, the output is not sorted
D. NULL values are not ignored during duplicate checking
Answer: D
与正式题库152重复
http://blog.csdn.net/jgmydsai/article/details/27799467
Which statement is true regarding the UNION operator?
A. The number of columns selected in all SELECT statements need to be the same
B. Names of all columns must be identical across all SELECT statements
C. By default, the output is not sorted
D. NULL values are not ignored during duplicate checking
Answer: D
与正式题库152重复
http://blog.csdn.net/jgmydsai/article/details/27799467
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