问题:
A . select to_char(sysdate,'D') from dual;
B . select to_char(sysdate,'W') from dual;
C . select to_char(sysdate,'D')-1 from dual;
D . select to_char(sysdate-1,'D') from dual;
E . select to_char(sysdate-1,'W') from dual
● 参考解析
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