How to do the on duplicate update in insert query in sql

Question

Hi @everyone,

Please share your knowledge to do the on duplicate update in sql.

Answer 1

Hi @Olaf Helper , My requirement is I have to insert some col1, col2. Out of this col2 is unique column. So already col2 having same value. So I want to update that value automatically while doing the insert.

Answer 2

use the merge statement

merge MyTable t
using (select @col1, @col2) as s (col1, col2)
  on t.col2 = s.col2
when matched then 
  update set col1 = s.col1
when not matched then
  insert (col1, col2)
  values (s.col1, s.col2)