Question

怎样在oracle中使用to_date函数查询1981年入职的员工姓名

Answer 1

select name from user_table
where enter_date >= to_date('1981/01/01','yyyy/mm/dd')
and enter_date <= to_date('1981/12/31','yyyy/mm/dd')

name是员工姓名的字段名
user_table是你要查询的表名
enter_date是入职时间的字段名

Answer 2

select *
from user_table
where to_char(enter_date,'YYYY') = '1981'

Answer 3

SQL> select * from emp
2 where to_char(hiredate,'yyyy')='1981';

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
7499 ALLEN SALESMAN 7698 1981-2-20 1600.00 300.00 30
7521 WARD SALESMAN 7698 1981-2-22 1250.00 500.00 30
7566 JONES MANAGER 7839 1981-4-2 2975.00 20
7654 MARTIN SALESMAN 7698 1981-9-28 1250.00 1400.00 30
7698 BLAKE MANAGER 7839 1981-5-1 2850.00 30
7782 CLARK MANAGER 7839 1981-6-9 2450.00 10
7839 KING PRESIDENT 1981-11-17 5000.00 10
7844 TURNER SALESMAN 7698 1981-9-8 1500.00 0.00 30
7900 JAMES CLERK 7698 1981-12-3 950.00 30
7902 FORD ANALYST 7566 1981-12-3 3000.00 20

10 rows selected