In a join, how to prefix all column names with the table it came from

Question

I\'m analysing a rather horrible legacy database/codebase, trying to reduce server load by combining queries into joins (including an email alert cron job that typically inv

Answer 1

You may try dynamic sql to create a query on the go as per the table definition.

declare @col varchar(max)
set @col = Select stuff( 
          (select ', ' + column_name + '.' + table_name 
           from information_schema.columns 
           where table_name in ( 'table1', 'table2' ...) for xml 
           path('')),1,1,'')

declare @query nvarchar(max) = '
select ' + @col + ' 
from table1 
inner join table2 on table1.id = table2.id '

exec sp_executesql @query