Question

我有两个表，每个表包含三个属性。我希望显示table 1和table 2中的所有记录，仅提取table 1中不存在的记录。

表1

  ID   Percentage  OrderDate
+----+------------+----------+
  1      2.0       2015-05-08
  1      5.0       2014-05-08 
  1      19.65     2013-05-08
  1      5.06      2012-05-08
  1      98.0      2011-05-08
  1      8.56      2010-05-08
+----+------------+----------+

表2

  ID   Percentage  OrderDate
+----+------------+----------+
  1      45.5      2015-05-08
  1      45.23     2014-05-08 
  1      12.00     2013-05-08
  1      6.45      2012-05-08
  1      18.0      2011-05-08
  1      5.2       2010-05-08
  1      12.0      2009-05-08
  1      22.78     2008-05-08 
  1      48.9      2007-05-08
  1      7.89      2006-05-08
  1      17.96     2005-05-08
  1      11.3      2004-05-08
+----+------------+----------+

Answer 1

您可以使用EXCEPT keyword：

SELECT ID, Pourcentage, OrderDate
FROM table1
UNION
(
    SELECT ID, Pourcentage, OrderDate
    FROM table2
    EXCEPT
    SELECT ID, Pourcentage, OrderDate
    FROM table1
)

Answer 2

根据您所比较的列，您可以使用以下内容。

SELECT t1.ID, t1.Percentage, t1.OrderDate
FROM table1 t1
UNION ALL
SELECT t2.ID, t2.Percentage, t2.OrderDate
FROM table1 t1
INNER JOIN table2 t2 ON t2.ID <> t1.ID AND t2.Percentage <> t1.Percentage AND t2.OrderDate <> t1.OrderDate

Answer 3

如果你想删除重复使用联合

 select ID, Percentage, OrderDate
 from table1
 union
 select ID, Percentage, OrderDate
 from table2

如果您希望表中的所有行都使用union all

 select ID, Percentage, OrderDate
 from table1
 union all
 select ID, Percentage, OrderDate
 from table2

显示table1中的记录和table2中的记录，表1中不存在这些记录

3 个答案: