OCP-1Z0-051 補充題庫 第27題 UNION的注意事項
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
答案: D
(我的理解，答案應該是AD)
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