Question

I have a table where I want to copy some data back to the same table with two columns getting changed:

e.g:

TableMusic

titleid   musicid  tap_id            value

1234         1      3                 this is music
1324         1      3                 this is music test

I want the titleid and the value to be written back to the same table with musicid=3

Here the indexed columns are titleid, musicid

I have done the following script but got an error: attempt to insert duplicate key row in object ‘tablemusic’ with unique index ‘pk_tablemusic’

insert into tablemusic (titleid, musicid, value )
  select titleid, 3, value
  from tablemusic
  where musicid=1

What am I doing wrong here? Can someone come up with a clean script to get the job done.

following is an extract from my DB for one titleID:

titleid   musicid    tap_id              value

462847        1        3               this is my music value 
462847        2        1    
462847        3        1    
462847        4        1     

this is the same for all titleid’s. Now what I want to do is copy the value from musicid=1 to musicid=3 and also sometime change the tap_id to 3. I hope this is clear enough of what i want to achieve

Final Result want to achieve:

titleid musicid tap_id value

462847        1        3               
462847        2        1    
462847        3        3               this is my music value 
462847        4        1     

Answer 1

The complexity is that some records exist so trying a simple insert duplicates the key and you get the error. What you have to do here is to break up the query into two prts

1. Update the rows with musicid = 3 that exist
2. Insert the rows where music id=3 does not exist