Hello, I have two tables - one containing messages, and another containing links between messages and other messages in a tree structure (much like a threaded mailing list archiving thing). A single message can have multiple "parents" though, meaning the links table can have several entries for a single message. For example:
---------------- child parent 10 5 10 7 11 5 12 7 13 5 13 7 ---------------- I would like to display all messages which match both 5 and 7 in terms of the parent_id, meaning messages 10 and 13 would be displayed. I have used the following query: ------------------------------------------------------------ SELECT DISTINCT message.username,message.content FROM message,links WHERE links.child_id = message.id AND ( links.parent_id = 5 OR links.parent_id = 7 ); ------------------------------------------------------------ NOTE: Without the word DISTINCT, if this query finds a message that matches both 5 AND 7, it will display the message twice. I have obviously used DISTINCT as an easy way to get around this problem. However, this query displays the message if it matches 5 OR 7. I only want it to be displayed if it matches 5 AND 7. However, if i change the word "OR" to "AND", it displays no message at all! I presume this is because it finds two instances of each message, neither of which match both 5 and 7 (i.e. the first instance matches 5, but not 7, and the second instance matches 7, but not 5). Does anyone know how i can get around this problem? Thanks in advance to anyone who can help! :-) Richard. -- Richard Hobbs [EMAIL PROTECTED] Visit my web sites: http://mysites.mongeese.co.uk Would you like jokes in your email? http://jokes.fishsponge.co.uk Would you like to discuss unix/linux? http://ufq.unixforum.co.uk -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
