如何比较两个表并在实体或SQL中插入其他表？ [英] How to compare two table and insert other table in entity or SQL?

问题描述

如何比较不同的数据库表和如果两列不相同，添加到其他表。然后如果不相等状态得到0.



我尝试了什么：

How to compare different database table and If two columns are not identical, add to other table.And then if not equal status get 0.

What I have tried:

DATABASE STUDENT -TABLE STUDENT

ID   NAME   COUNTRYNO   AGE   BRANCHCODE
1    Alex    185        25       15
2    Mary    146        26       19
3    Emily   102        45       14


DATABASE PERSON - TABLE PERSON

ID   NAME   COUNTRYNO   AGE   BRANCHCODE  
1    John     127        45      65
2    Elize    125        54      39
3    Toms     127        42      94

<pre>I would like to look at two columns and two columns, and then look at the country no and the branchcode that are in the person. I want to insert into the table named NewTable if these two columns are different.

 DATABASE STUDENT - NEW STUDENT 

 
ID   NAME   COUNTRYNO   AGE   BRANCHCODE  DURUM
1    John     127        45      65        0
2    Elize    125        54      39        0
3    Toms     127        42      94        0



var common =query1.Intersect(query2);

string query= "SELECT COUNTRYNO,BRANCHCODE FROM " + DATABASE.SCHEMA + ".dbo.STUDENT";

string query2= "SELECT COUNTRYNO,BRANCHCODE FROM " + DATABASE.SCHEMA + ".dbo.PERSON";



How can I do with sql query or entity (add range).

推荐答案

MERGE语句会这样做（基于你的有限 - 和荒谬 - 示例数据集）。

A MERGE statement would do it (based on your limited - and nonsensical - example data set).

MERGE table1 AS t
USING table2 AS s
ON (t.id = s.id)
WHEN MATCHED THEN
SET t.name = s.name,
    t.countryno = s.countryno,
    t.age = s.age,
    t.branchcode = s.branchcode
WHEN NOT MATCHED
INSERT (name, countryno, age, branchcode)
VALUES (s.name, s.countryno, s.age, s.branchcode);

上面的代码将更新任何行目标表中的ID与源表中的ID匹配。否则，如果找不到匹配项，源行将被添加到目标表。



如果我的例子，你将最终得到三个记录目标表。



CAVEAT：我输入了这个，所以可能需要进行一些小的调整来实际执行。

The code above will update any row where the ID from the target table matches the one from the source table. Otherwise, if a match isn't found, the source row will be added to the target table.

If my example, you will end up with three records in the target table.

CAVEAT: I typed this off the top of my head, so it may need some minor tweaking to actually execute.

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