update statement using nested query

Question

I have a table:

mytable:
    id
    userID
    logDate
    lastLogDate

For every row in that table, I want to update the \'lastLogDate\' co

Answer 1

you can simply write a nested query like this

    Update  mytable a 
    set 
    a.lastLogDate = (select max(logDate) from mytable b
    where a.id=b.id)
    Where...;