[kh99]

So just to make sure I understand, do you want a query so that the database starts out as:

table 'posts':
1, 2, "This is a post"
2, 5, "This is another post"
3, 3, "This is a third post"

table 'addings':
1, 2, "Add text-"
3, 3, "More added text-"

then you run the query once and the database is

table 'posts':
1, 2, "Add text-This is a post"
2, 5, "This is another post"
3, 3, "More added text-This is a third post"

table 'addings':
1, 2, "Add text-"
3, 3, "More added text-"

?