Change Columns Name dynamically in sql

Question

I have a query result like this :

Date       User1 User2 User3 ....
----------------------------------
1/1/2000   55     78    98   ...
1/1/2001   26     33    5         


        

Answer 1

To get the mapping You can use a lookup table of old column name to new column name for example

CREATE TABLE colname(
  oldname varchar(20),
  newname varchar(20)
)

insert into colname values ( 'user1','user1 (blue)');
insert into colname values ( 'user2','user2 (green)');

then you can build an sql statement that uses this mapping

declare @sq varchar(2000)
set @sq ='select date'
select @sq = @sq +  ',' + oldname + ' as [' + newname +']' from colname
set @sq = @sq + 'from ( existing query goes here ) ' 
select @sq

when the sql in @sq looks good you can replace the last select with

exec ( @sq ) 

to run the query