Question

我有像这样的Oracle SQL查询

SELECT *
FROM test
WHERE 1 =1
AND req_no IN
  (SELECT req_no
  FROM test
  WHERE date1 IS NOT NULL
  AND date1 BETWEEN '1-JUN-12' AND '30-JUN-12'
  )

问题是WHERE条件无法正常工作。在上述情况下，如果＆＃39; date1＆＃39; 是非NULL然后我想检查＆＃39; date1＆＃39;介于＆＃39; FROM＆＃39;之间和＆＃39; TO＆＃39;日期。 * 修改 * 我添加了样本表数据

Test table
From date: 1-JUN-2012
To date: 30-JUN-2012

record      date1          date2            date3
1       12-JUN-2012     13-JUN-2012         12-JUN-2012
2       null            null                12-JUN-2012
3       null            3-JUN-2012          null
4       12-JUN-2012     null                null
5       12-JUN-2012     13-JUL-2012         12-JUN-2012
6       null                null             null

在上述记录中，它将返回记录号= 1,2,3,4而非第6记录。

Answer 1

您可以像这样使用OR：

WHERE date1 IS NULL
  OR date1 BETWEEN '1-JUN-12' AND '30-JUN-12'

您的整个查询应该是：

SELECT *
FROM test
WHERE 1 =1
AND req_no IN
  (SELECT req_no
  FROM test
  WHERE date1 IS NULL
  OR date1 BETWEEN '1-JUN-12' AND '30-JUN-12'
  )

Answer 2

1=1是多余的。既然你说你想检查date1是否在日期范围之间，或者如果它是null，那么它也没问题，试试：

SELECT *
FROM test
WHERE req_no IN
  (SELECT req_no
  FROM test
  WHERE date1 BETWEEN to_date('06/01/2012','mm/dd/yyyy') 
         AND to_date('06/30/2012','mm/dd/yyyy') 
        OR date1 is null
  )

Answer 3

我认为您不需要子查询，您可以使用单个查询直接选择相关记录同样你也不需要检查date1是否为空

SELECT *  FROM test
  WHERE TO_DATE('12/2/2003','MM/DD/YYYY') <= date1 
AND TO_DATE('12/5/2003','MM/DD/YYYY') >= date1

Answer 4

找到一些解决方法，但它非常冗长

  SELECT *
FROM dates
WHERE 1  =1
AND( 
  no IN
  ( SELECT no FROM dates WHERE date1 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date2 is null and date3 is null ) 
  or 
   no IN
  ( SELECT no FROM dates WHERE date2 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date1 is null and date3 is null ) 
  or 
   no IN
  ( SELECT no FROM dates WHERE date3 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date1 is null and date2 is null ) 
   or 
   no IN
  ( SELECT no FROM dates WHERE date3 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date1 BETWEEN '1-JUN-12' AND '30-JUN-12' and date2 BETWEEN '1-JUN-12' AND '30-JUN-12' )
   or 
   no IN
  ( SELECT no FROM dates WHERE date1 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date1 BETWEEN '1-JUN-12' AND '30-JUN-12' and date3 is null )
    or 
   no IN
  ( SELECT no FROM dates WHERE date3 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date3 BETWEEN '1-JUN-12' AND '30-JUN-12' and date2 is null )
   or 
   no IN
  ( SELECT no FROM dates WHERE date2 BETWEEN '1-JUN-12' AND '30-JUN-12'
  and date3 BETWEEN '1-JUN-12' AND '30-JUN-12' and date1 is null )

  )

WHERE子句中SQL查询中的IF条件

4 个答案: