Question

我想创建一个SELECT语句，它从同一个数据库中的两个表中选择两个不同的列。

SELECT  TNC301X.DIRIN, NC301B.PATH301
FROM    TNC301X, NC301B
WHERE   TNC301X.EDIPROC like 'P30_' AND NC301B.EDIPROC like 'P30_'
    AND (LASTENRIN > 0) OR (LF301M > 0) 
    AND (DIRIN NOT LIKE '%saptemp%')
    AND (DIRIN NOT LIKE '%SAPTEMP%')  
    AND (DIRIN NOT LIKE '%usr%')  
    AND (DIRIN NOT LIKE '%Windows%');

我只想选择DIRIN和PATH301列中的内容。

TNC301X.DIRIN         NC301B.PATH301
\\ABC\DEF\            \\ABC\DEF\
\\GHI\JKL\            \\GHI\JKL\ 
\\MNO\PQR\            \\MNO\PQR\

声明似乎在语法上是正确的，但输出不是。当我为每个表创建一个语句时，输出是正确的。表格不相等。

选择-PATH301

SELECT  PATH301 
FROM    NC301B
WHERE   EDIPROC like 'P30_'
    AND (LF301M > 0) 
    AND (PATH301 NOT LIKE '%saptemp%')
    AND (PATH301 NOT LIKE '%SAPTEMP%')  
    AND (PATH301 NOT LIKE '%usr%')  
    AND (PATH301 NOT LIKE '%Windows%');

选择-DIRIN

SELECT  DIRIN
FROM    TNC301X
WHERE   EDIPROC like 'P30_'
    AND (LASTENRIN > 0) 
    AND (DIRIN NOT LIKE '%saptemp%')
    AND (DIRIN NOT LIKE '%SAPTEMP%')  
    AND (DIRIN NOT LIKE '%usr%')  
    AND (DIRIN NOT LIKE '%Windows%');

我想要做的就是结合这些陈述，但我不知道如何。

编辑：我明白了。

仅供参考

SELECT DIRIN 
FROM TNC301X 
WHERE EDIPROC like 'P30_' 
AND (DIRIN NOT LIKE '%saptemp%') 
AND (DIRIN NOT LIKE '%SAPTEMP%')
AND (DIRIN NOT LIKE '%usr%')  
AND (DIRIN NOT LIKE '%Windows%')
UNION ALL 
SELECT PATH301 
FROM NC301B 
WHERE EDIPROC like 'P30_' 
AND (PATH301 NOT LIKE '%saptemp%') 
AND (PATH301 NOT LIKE '%SAPTEMP%')
AND (PATH301 NOT LIKE '%usr%')  
AND (PATH301 NOT LIKE '%Windows%');

Answer 1

要加入两个表，您需要匹配两个表的ID，例如＆＃39; where table1.id = table2.id＆＃39;。在这种情况下我认为加入这两个表的id是EDIPROC列。我可能错了。

SELECT NC.PATH301,TNC.DIRIN
FROM (
      SELECT  PATH301 
      FROM    NC301B
      WHERE   EDIPROC like 'P30_'
      AND (LF301M > 0) 
      AND (PATH301 NOT LIKE '%saptemp%')
      AND (PATH301 NOT LIKE '%SAPTEMP%')  
      AND (PATH301 NOT LIKE '%usr%')  
      AND (PATH301 NOT LIKE '%Windows%')
 ) NC, 
 (   
      SELECT  DIRIN
      FROM    TNC301X
      WHERE   EDIPROC like 'P30_'
      AND (LASTENRIN > 0) 
      AND (DIRIN NOT LIKE '%saptemp%')
      AND (DIRIN NOT LIKE '%SAPTEMP%')  
      AND (DIRIN NOT LIKE '%usr%')  
      AND (DIRIN NOT LIKE '%Windows%')
 ) TNC
 WHERE NC.EDIPROC  = TNC.EDIPROC

Answer 2

Union正是您要找的。只需合并两个Select语句即可。如果您希望在表格中找到重复的结果，并且希望所有结果都显示在输出中，请使用Union all More info on w3schools

SQL - 两个表上的SELECT语句

2 个答案: