表连接或Linq / Lambda表达式比较 [英] Table Joins or Linq/Lambda expression comparison
问题描述
我的SQL Server数据库中有六个表。
步骤1：我将表1，表2和表3联合到Datatable1中。
步骤2：我将表4，表5和表6全部联合到Datatable2中。
在所有6个表中常见的列是AlbumID，PictureID，StoryID。
现在我想比较两个Datatables中的这些列，并在Datatable1中放置一个标志（True）所在的数据两个数据表都匹配其他False。
我正在考虑使用Linq或Lambda Expression进行比较。这是正确/最好的方法吗？或者我应该去TABLE JOINS吗？
基本上桌子应该有4列： -
AlbumID ，PictureID，StoryID，Flag
仅当Datatable2中存在AlbumID或PictureID或StoryID时，标志才为真
I have six tables in my SQL Server database.
Step 1: I UNION ALL Table 1, Table 2 and Table 3 into Datatable1.
Step 2: I UNION ALL Table 4, Table 5 and Table 6 into Datatable2.
In all the 6 tables the common columns are AlbumID,PictureID,StoryID.
Now I want to compare these columns in both the Datatables and put a flag (True) in Datatable1 where the data in both the datatables match else False.
I am thinking to use Linq or Lambda Expression to do the comparison. Is this the correct/best way to do this? OR should I go for TABLE JOINS?
Basically the table should have 4 columns :-
AlbumID, PictureID, StoryID, Flag
Flag would be true only if AlbumID or PictureID or StoryID is present in Datatable2
推荐答案
我想它'这是一个意见问题，但我个人会加入表格或使用 EXISTS [< a href =http://msdn.microsoft.com/en-us/library/ms188336.aspxtarget =_ blanktitle =New Window> ^ ]子句。
但是，我要做的第一件事就是停止思考数据库设计本身。如果你的表有这么多常见的列，那么就会提出一个问题，即数据库是否正常规范化了。
因此，如果不了解更多有关表的话，我会建议你仔细看看数据库设计，并考虑是否有6个表都有列AlbumID，PictureID，StoryID，你可以简化设计。
I guess it''s a matter of opinion, but personally I would either join the tables or use an EXISTS[^] clause.
However, the first thing I would do is to stop to think the database design itself. If you have tables that have so many common columns, it raises the question if the database s normalized properly.
So without knowing anything more about the tables, I would advice you to have a closer look at the database design and consider if instead of having 6 tables which all have columns AlbumID,PictureID,StoryID could you simplify the design.
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