plsql實現統計員工入職年份人數

--統計公司員工入職年份的員工數 declare cursor p_cursor is select to_char(hiredate,'YYYY' ) from emp; p_hiredate char(10); count80 number:=0; count81 number:=0; count87 number:=0; count82 number:=0; begin open p_cur

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