Question

how do i do this in mysql 5.5? Was thinking concat but I think there’s something simpler.

id  content
1
2

update posts set content='here is content ' + this.id

so that:

id content 
1  here is content 1
2  here is content 2

thx

Answer 1

This does what you need:

update posts
    set content=CONCAT('here is content ', CAST(id as CHARACTER))

Here is a link to a test on SQLFiddle.