单选题语句select LAST_DAY（‘2011-05-01’）from dual；的结果是（）。A2011-05-28B2011-05-31C2011-04-30D2011-05-07
单选题
语句select LAST_DAY（‘2011-05-01’）from dual；的结果是（）。
A
2011-05-28
B
2011-05-31
C
2011-04-30
D
2011-05-07
参考解析
解析：
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