Question

我搜索了几个小时没有具体回答我的问题。

我有两张桌子，例如：

表A

DateAndTime             ms  us  F1      F2      F3
2012-07-07 00:00:00.000 0   0   1       1       1   
2012-07-07 01:07:40.000 750 361 1       0       1   
2012-07-07 01:07:41.000 50  11  1       0       1  
2012-07-07 01:08:35.000 850 998 1       0       0
2012-07-07 01:08:36.000 50  83  1       0       0
2012-07-07 01:08:59.000 250 26  0       0       0

表B

DateAndTime             ms  us  F4      F5      F6
2012-07-07 00:00:00.000 0   0   1869    11      2247
2012-07-07 00:00:00.000 0   588 1869    15      2247
2012-07-07 00:05:14.000 987 359 1869    13      2251
2012-07-07 00:05:16.000 45  493 1869    11      2247
2012-07-07 00:14:15.000 985 557 1869    11      2157
2012-07-07 00:14:16.000 945 179 1869    11      2279

我正在寻找的结果是合并这两个表：

结果表

DateAndTime             ms  us  F1      F2      F3      F4      F5      F6
2012-07-07 00:00:00.000 0   0   1       1       1       1869    11      2247
2012-07-07 00:00:00.000 0   588 NULL    NULL    NULL    1869    15      2247 
2012-07-07 00:05:14.000 987 359 NULL    NULL    NULL    1869    13      2251
2012-07-07 00:05:16.000 45  493 NULL    NULL    NULL    1869    11      2247
2012-07-07 00:14:15.000 985 557 NULL    NULL    NULL    1869    11      2157
2012-07-07 00:14:16.000 945 179 NULL    NULL    NULL    1869    11      2279
2012-07-07 01:07:40.000 750 361 1       0       1       NULL    NULL    NULL     
2012-07-07 01:07:41.000 50  11  1       0       1       NULL    NULL    NULL     
2012-07-07 01:08:35.000 850 998 1       0       0       NULL    NULL    NULL  
2012-07-07 01:08:36.000 50  83  1       0       0       NULL    NULL    NULL  
2012-07-07 01:08:59.000 250 26  0       0       0       NULL    NULL    NULL

两个表中的PRIMARY KEY由（DateAndTime，ms，us）组成。

如果两个表具有相同的主键，那么数据可以合并到同一行，否则只有新的行，其中没有数据就是NULL。

列名并不总是相同的，所以我必须使用C＃动态构建查询然后执行它。在开始用C＃处理数据之前，我只是想在SQL服务器端做很多工作。

Answer 1

尝试以下查询..

SELECT A.DATEANDTIME,A.MS,A.US,A.F1,A.F2,A.F3,B.F4,B.F5,B.F6 FROM TABLEA A FULL OUTER JOIN TABLEB B ON A.DATEANDTIME = B.DATEANDTIME
UNION
SELECT B.DATEANDTIME,B.MS,B.US,A.F1,A.F2,A.F3,B.F4,B.F5,B.F6 FROM TABLEA A FULL OUTER JOIN TABLEB B ON A.DATEANDTIME = B.DATEANDTIME

Answer 2

将以下内容用于SQL Server或MY SQL

SELECT T1.DATEANDTIME,
       T1.MS,
       T1.US,
       T1.F1,
       T1.F2,
       T1.F3,
       T2.F4,
       T2.F5,
       T2.F6
FROM   T1
       LEFT OUTER JOIN
       T2
          ON ( T1.DATEANDTIME = T2.DATEANDTIME AND T1.MS = T2.MS AND T1.US = T2.US )
UNION
SELECT T2.DATEANDTIME,
       T2.MS,
       T2.US,
       T1.F1,
       T1.F2,
       T1.F3,
       T2.F4,
       T2.F5,
       T2.F6
FROM   T1
       RIGHT OUTER JOIN
       T2
          ON ( T1.DATEANDTIME = T2.DATEANDTIME AND T1.MS = T2.MS AND T1.US = T2.US );

这是针对Oracle的

WITH T1
     AS (SELECT '2012-07-07 00:00:00.000' AS DATEANDTIME,
                '0' AS MS,
                '0' AS US,
                '1' AS F1,
                '1' AS F2,
                '1' AS F3
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 01:07:40.000' AS DATEANDTIME,
                '750' AS MS,
                '361' AS US,
                '1' AS F1,
                '0' AS F2,
                '1' AS F3
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 01:07:41.000' AS DATEANDTIME,
                '50' AS MS,
                '11' AS US,
                '1' AS F1,
                '0' AS F2,
                '1' AS F3
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 01:08:35.000' AS DATEANDTIME,
                '850' AS MS,
                '998' AS US,
                '1' AS F1,
                '0' AS F2,
                '0' AS F3
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 01:08:36.000' AS DATEANDTIME,
                '50' AS MS,
                '83' AS US,
                '1' AS F1,
                '0' AS F2,
                '0' AS F3
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 01:08:59.000' AS DATEANDTIME,
                '250' AS MS,
                '26' AS US,
                '0' AS F1,
                '0' AS F2,
                '0' AS F3
         FROM   DUAL),
     T2
     AS (SELECT '2012-07-07 00:00:00.000' AS DATEANDTIME,
                '0' AS MS,
                '0' AS US,
                '1869' AS F4,
                '11' AS F5,
                '2247' AS F6
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 00:00:00.000' AS DATEANDTIME,
                '0' AS MS,
                '588' AS US,
                '1869' AS F4,
                '15' AS F5,
                '2247' AS F6
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 00:05:14.000' AS DATEANDTIME,
                '987' AS MS,
                '359' AS US,
                '1869' AS F4,
                '13' AS F5,
                '2251' AS F6
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 00:05:16.000' AS DATEANDTIME,
                '45' AS MS,
                '493' AS US,
                '1869' AS F4,
                '11' AS F5,
                '2247' AS F6
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 00:14:15.000' AS DATEANDTIME,
                '985' AS MS,
                '557' AS US,
                '1869' AS F4,
                '11' AS F5,
                '2157' AS F6
         FROM   DUAL
         UNION ALL
         SELECT '2012-07-07 00:14:16.000' AS DATEANDTIME,
                '945' AS MS,
                '179' AS US,
                '1869' AS F4,
                '11' AS F5,
                '2279' AS F6
         FROM   DUAL)
SELECT T1.DATEANDTIME,
       T1.MS,
       T1.US,
       T1.F1,
       T1.F2,
       T1.F3,
       T2.F4,
       T2.F5,
       T2.F6
FROM   T1
       LEFT OUTER JOIN
       T2
          ON ( T1.DATEANDTIME = T2.DATEANDTIME AND T1.MS = T2.MS AND T1.US = T2.US )
UNION
SELECT T2.DATEANDTIME,
       T2.MS,
       T2.US,
       T1.F1,
       T1.F2,
       T1.F3,
       T2.F4,
       T2.F5,
       T2.F6
FROM   T1
       RIGHT OUTER JOIN
       T2
          ON ( T1.DATEANDTIME = T2.DATEANDTIME AND T1.MS = T2.MS AND T1.US = T2.US );

哪个产生

2012-07-07 00:00:00.000 0   0   1   1   1   1869    11  2247
2012-07-07 00:00:00.000 0   588             1869    15  2247
2012-07-07 00:05:14.000 987 359             1869    13  2251
2012-07-07 00:05:16.000 45  493             1869    11  2247
2012-07-07 00:14:15.000 985 557             1869    11  2157
2012-07-07 00:14:16.000 945 179             1869    11  2279
2012-07-07 01:07:40.000 750 361 1   0   1           
2012-07-07 01:07:41.000 50  11  1   0   1           
2012-07-07 01:08:35.000 850 998 1   0   0           
2012-07-07 01:08:36.000 50  83  1   0   0           
2012-07-07 01:08:59.000 250 26  0   0   0

注意：UNION会删除重复项。我不使用完全外部联接，因为并非所有数据库都支持

使用DateTime主键合并两个表，但列不同

2 个答案: