• 2022-05-25
    如何显示今天是星期几(周一到周日,分别用1~7表示)()
    A: selectto_char(sysdate,'D')fromdual;
    B: selectto_char(sysdate,'W')fromdual;
    C: selectto_char(sysdate,'D')-1fromdual;
    D: selectto_char(sysdate-1,'D')fromdual;
    E: selectto_char(sysdate-1,'W')fromdual;