除非您正在学习有关PL / sql的知识，否则从我本人和我那里得到的所有sql示例都可能是更好的选择。这是我想出的：
DECLARE
v_dob DATE:= to_date('&v_dob', 'MM/DD/YYYY'); -- copy this line and you'll be fine
v_your_age NUMBER(3, 1);
BEGIN
v_your_age := TRUNC(MONTHS_BETWEEN(SYSDATE, v_dob))/12;
DBMS_OUTPUT.PUT_LINE ('Your age is ' || v_your_age);
END;
/
I passed 01/01/2010. Got this in output:
Your age is 3.1
SELECT empno, ename, hiredate
, TRUNC(MONTHS_BETWEEN(sysdate, hiredate)/12) years_of_service
FROM scott.emp
/
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