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excluding rows

excluding rows

excluding rows

hi all,
i came up with this problem:

i have 3 tables:
create table questions (id ...);
create table users (id ...);
create table answers (question_id ..., user_id ...);

answers contains all users' answers given to the questions (questions can be answered more than once by different users). i now want to select all questions which were ...

1) not answered at all
2) not answered by a certain user

i'm too new to sql to find a solution (without subselects - because i have to use mysql here)


RE: excluding rows

sorry - it should read:

... 2) already answered by a certain user

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