How do I swap column values in sql server 2008?

Question

I have a table called Employee

 Eno     ename     AttributeValue      AttributeName  
 1       aa           a123             abc
 2       bbb          b123           


        

Answer 1

All the previous techniques are slow for big tables they move data instead of renaming columns, this is a simple solution:

ALTER TABLE "amplitude"
RENAME COLUMN "start_hour_displayed" TO "temp";

ALTER TABLE "amplitude"
RENAME COLUMN "start_hour" TO "start_hour_displayed";

ALTER TABLE "amplitude"
RENAME COLUMN "temp" TO "start_hour";

If you have views of functions linked you have to backup them before and restore them after.