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

Following update statement should do what you are looking for

update mytable mt set  lastLogDate  = (select max(logDate) from  mytable where userID = mt.userID)