Question

我是MYSQL的新手，想要通过UNION of 2创建一个表（Table_Result）给定表（Table1,2）。在表1,2中，“MEMORY”列中的一些值是相同的，但是相同存储器的计数可以相同或不同，如下所示。我想在“MEMORY”列的基础上创建新表（如table_result），该列具有最大的内存计数和前面的相对列。与其他表相比内存计数较少的表将使其他列（NAME，CONTENT或NAME1，CONTENT1）填充“NA”（参见table_result）。

任何想法如何编写Mysql查询脚本来获取结果。感谢你的帮助。

BR // RG

TABLE1
MEMORY      NAME            CONTENT
MEM 0110H   Systemkennung   DB01
MEM 0110H   Hauptversion    DB03
MEM 0110H   Unterversion    DB00
MEM 0110H   Patchlevel      DB04
MEM 0200H   Steuerkanal1    DB01
MEM 0200H   Steuerkanal2    DB01
MEM 0200H   Steuerkanal3    DB01
MEM 0260H   Steuerkanal35   DB01
MEM 0210H   BUE-Gruppe      DB01
MEM 0210H   Licht-Gruppe1   DB01

TABLE2
MEMORY      NAME1           CONTENT1
MEM 0110H   System          DB01
MEM 0110H   Hauptversion1   DB02
MEM 0200H   Steuerkanal11   DB01
MEM 0200H   Steuerkanal22   DB06
MEM 0200H   Steuerkanal34   DB05
MEM 0200H   Steuerkanal35   DB04
MEM 0260H   Steuerkanal36   DB02
MEM 0210H   BUE-Gruppe      DB01

TABLE_RESULT
MEMORY       NAME           CONTENT     NAME1           CONTENT1
MEM 0110H    Systemkennung  DB01        System          DB01
MEM 0110H    Hauptversion   DB03        Hauptversion1   DB02
MEM 0110H    Unterversion   DB00        NA              NA
MEM 0110H    Patchlevel     DB04        NA              NA
MEM 0200H    Steuerkanal1   DB01        Steuerkanal11   DB01
MEM 0200H    Steuerkanal2   DB01        Steuerkanal22   DB06
MEM 0200H    Steuerkanal3   DB01        Steuerkanal34   DB05
MEM 0200H    NA             NA          Steuerkanal35   DB04
MEM 0260H    Steuerkanal35  DB01        Steuerkanal36   DB02
MEM 0210H    BUE-Gruppe     DB01        BUE-Gruppe      DB01
MEM 0210H    Licht-Gruppe1  DB01        NA              NA

Answer 1

SELECT
  ifnull(a.MEMORY, b.MEMORY) AS MEMORY,
  ifnull(a.NAME, 'NA') AS NAME,
  ifnull(a.CONTENT, 'NA') AS CONTENT,
  ifnull(b.NAME, 'NA') AS NAME1,
  ifnull(b.CONTENT, 'NA') AS CONTENT1
FROM TABLE1 AS a
LEFT JOIN TABLE2 AS b ON a.MEMORY = b.MEMORY
UNION
SELECT
  ifnull(a.MEMORY, b.MEMORY) AS MEMORY,
  ifnull(a.NAME, 'NA') AS NAME,
  ifnull(a.CONTENT, 'NA') AS CONTENT,
  ifnull(b.NAME, 'NA') AS NAME1,
  ifnull(b.CONTENT, 'NA') AS CONTENT1
FROM TABLE1 AS a
RIGHT JOIN TABLE2 AS b ON a.MEMORY = b.MEMORY

Answer 2

答案如下：

conn.commit()

MySQL从两个表的UNION创建表

2 个答案: