过去 24 小时使用 Oracle SQL 从表中更新记录？

Question

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

见下文实际查询

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;

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

当记录更新时，此日期字段会发生变化。 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？

更改可以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 小时内更新了 cn 或 e 的所有行，如果您想显示同时更新的行，请将内部 OR 替换为 AND。

Answer 2

你要的是SYSDATE - 1，像这样：

 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;

该条件将获得 CHGD_DT 大于当前日期的所有内容（减去 1 天，因此是昨天）。

Answer 3

假设您的意思是“在过去 24 小时内更改的行”，正如您的标题所暗示的那样，而不是“最近 24 条更新的记录”，这意味着无论何时更改，您都希望准确返回 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CHGD_DT 在任一表中被索引，后者可能更有效。

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;