Question

我需要将两个表与只有一列进行比较。该查询应返回匹配项，而单独的查询应返回差异。

我创建了以下查询，但是仍然无法获取所需的信息。

两个表都只有一个名为IDNumber的列列的架构信息完全相同数据类型为Nvarchar 50

select * from EPE_Data_Cycle_77
Where [IDNumber] In ( select [IDNumber]
from  [EPE_Data_Cycle_76])

表包含超过200万行架构信息

TABLE_CATALOG   TABLE_SCHEMA    TABLE_NAME  COLUMN_NAME ORDINAL_POSITION    COLUMN_DEFAULT  IS_NULLABLE DATA_TYPE   CHARACTER_MAXIMUM_LENGTH    CHARACTER_OCTET_LENGTH  NUMERIC_PRECISION   NUMERIC_PRECISION_RADIX NUMERIC_SCALE   DATETIME_PRECISION  CHARACTER_SET_CATALOG   CHARACTER_SET_SCHEMA    CHARACTER_SET_NAME  COLLATION_CATALOG   COLLATION_SCHEMA    COLLATION_NAME  DOMAIN_CATALOG  DOMAIN_SCHEMA   DOMAIN_NAME
XRG_P_SmartLife_Aug_2018    dbo EPE_Data_Cycle_76   IDNumber    1   NULL    YES nvarchar    50  100 NULL    NULL    NULL    NULL    NULL    NULL    UNICODE NULL    NULL    Latin1_General_CI_AI    NULL    NULL    NULL
XRG_P_SmartLife_Aug_2018    dbo EPE_Data_Cycle_77   IDNumber    1   NULL    YES nvarchar    50  100 NULL    NULL    NULL    NULL    NULL    NULL    UNICODE NULL    NULL    Latin1_General_CI_AI    NULL    NULL    NULL

Answer 1

要执行此操作，并且不返回任何重复项，则需要在组合表上使用distinct。这是我完成任务的方式：

DECLARE @temp1 TABLE ( IDNumber NVARCHAR(MAX) )
DECLARE @temp2 TABLE ( IDNumber NVARCHAR(MAX) )

INSERT INTO @temp1 VALUES ('1'),('2'),('22'),('33')
INSERT INTO @temp2 VALUES ('3'),('2'),('77'),('33')


SELECT DISTINCT IDNumber FROM
(
    SELECT * FROM @temp1
    WHERE IDNumber IN (SELECT IDNumber FROM @temp2)
    UNION
    SELECT * FROM @temp2
    WHERE IDNumber IN (SELECT IDNumber FROM @temp1)
) matches

SELECT DISTINCT IDNumber FROM
(
    SELECT * FROM @temp1
    WHERE IDNumber NOT IN (SELECT IDNumber FROM @temp2)
    UNION
    SELECT * FROM @temp2
    WHERE IDNumber NOT IN (SELECT IDNumber FROM @temp1)
) differences

输出：

matches table:
2
33

differences table:
1
22
3
77

SQL查询返回差异，单独查询返回两个表之间的匹配项

1 个答案: