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PODB Schema for Facebook like Wall + "Shared links"
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copied!<p>I am making a db schema for facebook like wall structure. I need to save wall posts, share a link, share a video stuff into my database. Till now I am able to make this schema :</p> <pre><code>GO CREATE TABLE [Wall] ( [ID] [int] NOT NULL IDENTITY(1, 1) , [PostText] [nvarchar](MAX) [PostedByUserID] [int] NULL , [PostedOnUserID] [int] NULL , [DateCreated] [datetime] NULL ) GO </code></pre> <p>Next I have to add the schema for adding the "share a link" and "share a video" feature. </p> <pre><code>GO CREATE TABLE [Wall] ( [ID] [int] NOT NULL IDENTITY(1, 1) , [WallText] [nvarchar](MAX) [PostedByUserID] [int] NULL , [PostedOnUserID] [int] NULL , [DateCreated] [datetime] NULL, [SharedLink] [nvarchar](1024) NULL , [SharedLinkTitle] [nvarchar](512) NULL , [SharedLinkDesc] [nvarchar](512) NULL , [SharedLinkImageSrc] [nvarchar](512) NULL ) GO </code></pre> <p>Now with this schema:</p> <p>1st case: When the wall post is inserted the [SharedLink], [SharedLinkTitle],[SharedLinkDesc], [SharedLinkImageSrc] columns will be inserted as null and rest of the columns will have the values.</p> <p>2nd case: When the "link shared" is inserted the "[WallText]" column will be inserted as null and rest of the columns will have the values.</p> <p>For my case 70% of the time the wall post will be made and 30 % "links" will be shared which means 70 % of the cases [SharedLink], [SharedLinkTitle],[SharedLinkDesc], [SharedLinkImageSrc] will be inserted as null. Now my concern is that is it okay to keep the null columns inserted or I should go for a separate table for "shared a link" purpose and have the separated table like this:</p> <pre><code>GO CREATE TABLE [LinkShared] ( [ID] [int] NOT NULL IDENTITY(1, 1) , [PostedByUserID] [int] NULL , [PostedOnUserID] [int] NULL , [SharedLink] [nvarchar](1024) NULL , [SharedLinkTitle] [nvarchar](512) NULL , [SharedLinkDesc] [nvarchar](512) NULL , [SharedLinkImageSrc] [nvarchar](512) NULL ) GO </code></pre> <p>I have to go in similar manner to add the schema for sharing the videos further. Please guide me in which direction should I move ?</p>

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