Question

我有一个Pl / SQL查询，从3个表中提取所有记录。那很好。现在我想要从2个表（tbl_constit，tbl_email）中提取最后24个更新记录。

见下面的实际查询

SELECT DISTINCT c.constit_id AS constitid,
               REPLACE (c.in_labelname, 'None', '') AS fullname,
               c.firstname AS firstname, c.lastname AS lastname,
               c.indiv_title AS title, e.e_addr AS email,
              'InActive' AS status                               
          FROM tbl_constit cn, tbl_email e,tbl_catcod s
         WHERE c.constit_id = e.constit_id
           AND c.constit_id = s.constit_id(+)
           AND e.e_type = 'EMAIL'
           AND e.e_default = '1'
           AND s.cat_code IN ('SPEMU', 'SPENM')              
      ORDER BY c.constit_id;

表tbl_constit cn，tbl_email e有'CHGD_DT'字段。

更新记录时，此日期字段会更改。 现在如何使用“CHGD_DT”字段从tbl_constit cn或tbl_email中提取最近24条更新记录？

更改可能发生在两个表中的任何一个。

Answer 1

SELECT DISTINCT c.constit_id AS constitid,
               REPLACE (c.in_labelname, 'None', '') AS fullname,
               c.firstname AS firstname, c.lastname AS lastname,
               c.indiv_title AS title, e.e_addr AS email,
              'InActive' AS status                               
          FROM tbl_constit cn, tbl_email e,tbl_catcod s
         WHERE c.constit_id = e.constit_id
           AND c.constit_id = s.constit_id(+)
           AND e.e_type = 'EMAIL'
           AND e.e_default = '1'
           AND s.cat_code IN ('SPEMU', 'SPENM')
           AND ((cn.chgd_dt > (SYSDATE - 1)) OR (e.chgd_dt > (SYSDATE - 1)))
      ORDER BY c.constit_id;

这将显示过去24小时内cn或e更新的所有行，如果要显示更新的行，请用AND替换内部OR。

Answer 2

你想要的是SYSDATE - 1，如下所示：

 SELECT DISTINCT c.constit_id AS constitid,
           REPLACE (c.in_labelname, 'None', '') AS fullname,
           c.firstname AS firstname, c.lastname AS lastname,
           c.indiv_title AS title, e.e_addr AS email,
          'InActive' AS status                               
      FROM tbl_constit cn, tbl_email e,tbl_catcod s
     WHERE c.constit_id = e.constit_id
       AND c.constit_id = s.constit_id(+)
       AND e.e_type = 'EMAIL'
       AND e.e_default = '1'
       AND s.cat_code IN ('SPEMU', 'SPENM')              
       AND cn.CHGD_DT > SYSDATE - 1
  ORDER BY c.constit_id;

这个条件会使CHGD_DT大于现在的日期（减去1天，昨天）。

Answer 3

假设您的意思是“在过去24小时内已更改的行”，正如您的标题所暗示的那样，而不是“最后24条更新记录”，这意味着无论何时更改它们都需要返回24行，例如

SELECT DISTINCT c.constit_id AS constitid,
               REPLACE (c.in_labelname, 'None', '') AS fullname,
               c.firstname AS firstname, c.lastname AS lastname,
               c.indiv_title AS title, e.e_addr AS email,
              'InActive' AS status                               
          FROM tbl_constit cn, tbl_email e,tbl_catcod s
         WHERE c.constit_id = e.constit_id
           AND c.constit_id = s.constit_id(+)
           AND e.e_type = 'EMAIL'
           AND e.e_default = '1'
           AND s.cat_code IN ('SPEMU', 'SPENM')              
           AND greatest( cn.chgd_dt, e.chgd_dt ) > sysdate - interval '1' day
      ORDER BY c.constit_id;

或

SELECT DISTINCT c.constit_id AS constitid,
               REPLACE (c.in_labelname, 'None', '') AS fullname,
               c.firstname AS firstname, c.lastname AS lastname,
               c.indiv_title AS title, e.e_addr AS email,
              'InActive' AS status                               
          FROM tbl_constit cn, tbl_email e,tbl_catcod s
         WHERE c.constit_id = e.constit_id
           AND c.constit_id = s.constit_id(+)
           AND e.e_type = 'EMAIL'
           AND e.e_default = '1'
           AND s.cat_code IN ('SPEMU', 'SPENM')    
           AND (cn.chgd_dt > sysdate - interval '1' day OR
                e.chgd_dt  > sysdate - interval '1' day)          
      ORDER BY c.constit_id;

如果在任一表中索引CHGD_DT，后者可能会更有效。

Answer 4

SELECT *
FROM
(
       select DISTINCT
              c.constit_id AS constitid,
               REPLACE (c.in_labelname, 'None', '') AS fullname,
               c.firstname AS firstname, c.lastname AS lastname,
               c.indiv_title AS title, e.e_addr AS email,
              'InActive' AS status                               
          FROM tbl_constit cn, tbl_email e,tbl_catcod s
         WHERE c.constit_id = e.constit_id
           AND c.constit_id = s.constit_id(+)
           AND e.e_type = 'EMAIL'
           AND e.e_default = '1'
           AND s.cat_code IN ('SPEMU', 'SPENM')   
         ORDER BY GREATEST (cn.CHGD_DT, e.CHGD_DT)
        )            
WHERE rownum <= 24 
ORDER BY c.constit_id;

过去24小时使用Oracle SQL更新了表中的记录？

4 个答案: