开发者

MySQL .NET connector - Get table that column belongs to?

开发者 https://www.devze.com 2023-03-23 07:26 出处:网络
I am going through all the columns of a row\'s table\'s columns (that was a tricky way of saying it - basically I have a row \"R\", where I use R.Table.Columns to iterate through them).

I am going through all the columns of a row's table's columns (that was a tricky way of saying it - basically I have a row "R", where I use R.Table.Columns to iterate through them).

For each column, I would like to know which table it belongs to.

However, with the following query, only 1 table appears in the resultset. How come? I need to distinguish between the different tables, even if the column names are the same.

SELECT * FROM User LEFT OUTER JOIN Prov开发者_JS百科ider ON User.ProviderID=Provider.ID WHERE User.IsDeleted=false


Use aliases:

SELECT 
 table1.column1 AS foo,
 table2.column1 AS bar,
 ...

Using SELECT * is bad practice anyway: SELECT * is evil


You should strongly consider using the show tables and show columns commands for database discovery

You can then generate queries from that and avoid using select *

To awnser your question more directly, i dont think its possible to get the table name for a column in a result set since those columns doent have to come from a table at all. Consider this completely valid query for example:

select 'foo' as bar, 1+1 as result;
0

精彩评论

暂无评论...
验证码 换一张
取 消