sql编程 1时间:2023-03-09 01:11:00 declare emp_count number;begin select count(*) into emp_count from emp where HIOREDATE >= TO_DATE('01-01-1980', 'DD-MM-YYYY') and HIOREDATE <= TO_DATE('01-12-1981', 'DD-MM-YYYY'); dbms_output.PUT_LINE(emp_count);end;