modify the data of column while copying the data of column from other table

In mysql, I am trying to copy the data from one column to other column of different table. I have used the below command to achieve this.

insert ignore into user(payload) select payload from group;

data in old column is data:test

data in new column should be {“payload”:”data:test”}

As of now when I used the above insert command, it just copies the data as is from old column, I want the new column to be updated as {“payload”:”data:test”}

Answer

Actually that quite simple with the use of the CONCAT() function

insert ignore into user(payload) 
    select CONCAT( '{"payload":"', payload, '"}' ) from group;

A tutorial to explain the CONCAT() function