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POselect statement + join n' stuff
 

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  1. POselect statement + join n' stuff
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    <pre><code>SELECT * FROM LiveStreams l INNER JOIN Friendships f ON f.Sender = l.Sender OR f.Sender = l.Recipient OR f.Recipient = l.Sender OR f.Recipient = l.Recipient WHERE l.Sender = @SomeUser OR l.Recipient = @SomeUser </code></pre> <p>My attempt for now ^</p> <p>So, what im trying to do here is get all the streams from (livestreams table) of all the friends of a given @SomeUser. We can know the friends by using this query:</p> <pre><code>SELECT Id, CASE WHEN Sender = @UserName THEN Recipient ELSE Sender END AS Friend, IsPending, DateTime FROM Friendships WHERE (Sender = @UserName OR Recipient = @UserName) AND IsPending = @IsPending; </code></pre> <p>Given a @SomeUser, I would like to lookup his/her friends from the Friendships table having 3 columns (Id, Sender, Recipient) using single row (where the friend can be either the sender or the recipient) I would like to get all the friends and then get their speicifed stream from the livestream table (Id, Value, Sender, Recipient) </p> <p>Sort of like the Facebook NewsFeed, When a @Person goes to the livestream pages, we will look for all the streams coming from his friends only. If his friends INITITED the stream or were sent the stream so they could be on either column too.. Sender or Recipient.</p> <p>How can this be achieved? Ty</p> <p>How can I do that?</p> <p>**</p> <h2>UPDATE:</h2> <p>**</p> <p>THanks for the answers.</p> <pre><code>SELECT l.* LiveStreams l INNER JOIN Friendships f ON f.Sender = 'beta' OR f.Recipient = 'beta' WHERE l.Sender = 'beta' OR l.Recipient = 'beta' OR l.Sender = f.Recipient OR l.Sender = f.Sender OR l.Recipient = f.Sender OR l.Recipient = f.Recipient </code></pre> <p>What doesn't work about this is that it still shows the feeds where beta is either the stream sender or the reciever, which I don't want because he's not a friend of himself. is there a fix? Thanks again.</p> <p>I don't know if this helps but that's how im getting the friend list of someone..</p> <pre><code> "SELECT foo.* " + "FROM (SELECT Id, Sender, CASE " + "WHEN Sender = @UserName THEN Recipient " + "ELSE Sender " + "END AS UserName, IsPending, DateTime " + "FROM Friendships WHERE " + "Sender = @UserName " + "or Recipient = @UserName " + ") as foo " + "where foo.UserName = @FriendName;"; </code></pre>
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    1. COWhy do live streams have a single recipient? And does a single recipient mean that only that recipient should be able to view the stream?
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    2. COI store livestreams when any user posts a comment on someone elses wall.. so the sender is the sender and the recipient is the recipient, then when some other user logs into the livestream page, i'd like to filter out his friends from the livestream table (friends can be senders or recipients) and display the livestream value and id. :)
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    3. COIs 'beta' not allowed to see his own streams? I added a new suggestion...
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      1. USAlex
 

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