Question

这是我的代码：

    SELECT EMPNO, ENAME, JOB, to_char(HIREDATE, 'Month YYYY'), SELECT 
    EXTRACT(YEAR FROM SYSDATE) - EXTRACT(YEAR FROM HIREDATE) FROM EMP;

    CASE
    WHEN DEPTNO = 10 THEN 'Accounting'
    WHEN DEPTNO = 20 THEN 'Research'
    WHEN DEPTNO = 30 THEN 'Sales'
    WHEN DEPTNO = 40 THEN 'Operations'
    END AS DEPT
    FROM EMP;

我可以在另一个命令窗口中单独使用select extract函数，但在此查询中似乎无法使其正常工作。在添加日期减法部分之前，查询成功。抱歉，菜鸟问题我对SQL还是很陌生。任何帮助将不胜感激

Answer 1

看来您不需要额外的选择

SELECT EMPNO, ENAME, JOB, to_char(HIREDATE, 'Month YYYY'),  
        EXTRACT(YEAR FROM SYSDATE) - EXTRACT(YEAR FROM HIREDATE),

        CASE
        WHEN DEPTNO = 10 THEN 'Accounting'
        WHEN DEPTNO = 20 THEN 'Research'
        WHEN DEPTNO = 30 THEN 'Sales'
        WHEN DEPTNO = 40 THEN 'Operations'
        else null
        END AS DEPT
        FROM EMP;

如何在我的SQL中实现减日期？

1 个答案: