Question

如果我想显示使用滞后条件的双重小于 sysdate 的所有日期，我该怎么做

从项目中选择sysdate - 如何在此查询中使用滞后？

我的输出应使用滞后条件

显示小于 sysdate 的所有日期

Date
30-jun-2015
29-june-2015
28-june-2015

等

Answer 1

查询1 - 选择从开始日期到今天的日期：

SELECT TRUNC(SYSDATE) - LEVEL + 1 AS "Date"
FROM   DUAL
CONNECT BY TRUNC(SYSDATE) - LEVEL + 1 >= DATE '2015-06-26'

<强>结果：

|                   Date |
|------------------------|
| July, 01 2015 00:00:00 |
| June, 31 2015 00:00:00 |
| June, 30 2015 00:00:00 |
| June, 29 2015 00:00:00 |
| June, 28 2015 00:00:00 |
| June, 27 2015 00:00:00 |
| June, 26 2015 00:00:00 |

查询2 - 选择多个范围之间的日期：

WITH ranges ( start_date, end_date ) AS (
  SELECT DATE '2015-06-02', DATE '2015-06-07' FROM DUAL
  UNION ALL
  SELECT DATE '2015-06-12', DATE '2015-06-14' FROM DUAL
)
SELECT START_DATE + COLUMN_VALUE AS "Date"
FROM   ranges,
       TABLE( CAST ( MULTISET(
         SELECT LEVEL - 1
         FROM   DUAL
         CONNECT BY START_DATE + LEVEL - 1 <= END_DATE
       ) AS SYS.ODCINUMBERLIST ) )

<强>结果：

|                   Date |
|------------------------|
| June, 02 2015 00:00:00 |
| June, 03 2015 00:00:00 |
| June, 04 2015 00:00:00 |
| June, 05 2015 00:00:00 |
| June, 06 2015 00:00:00 |
| June, 07 2015 00:00:00 |
| June, 12 2015 00:00:00 |
| June, 13 2015 00:00:00 |
| June, 14 2015 00:00:00 |

如何在sql中使用滞后函数来显示日期＆lt; SYSDATE

1 个答案: