Database Design. Need Advice. Thank You.

Hello,
I am creating a database where:
- I have a Blogs and Folders system.
- Use a common design so I can implement new systems in the future.
Users, Comments, Ratings, View, Tags and Categories are tables common
to all systems, i.e., used by Posts and Files in Blogs and Folders.
- One Tag or Category can be associated to many Posts or Files.
- One Comment, View or Rating should be only associated to one Post or
one File. I am missing this ... (1)
Relations between a File / Folder and Comments / Ratings / View /
Tags / Categories are done using FilesRatings, FoldersViews, etc.
I am using UniqueIdentifier as Primary Keys.
I checked ASP.NET Membership tables, a few articles and few features
in my project, such as renaming files with the GUID of their records.
I didn't decided yet for INT or UNIQUEIDENTIFIER.
I am looking for some feedback on the design of my database.
One thing I think need to improve is mentioned in (1)
But any advices to improve it would be great.
Thank You,
Miguel
My Database Script:
-- Users ...
create table dbo.Users
(
UserID uniqueidentifier not null
constraint PK_User primary key clustered,
[Name] nvarchar(200) not null,
Email nvarchar(200) null,
UpdatedDate datetime not null
)
-- Categories ...
create table dbo.Categories
(
CategoryID uniqueidentifier not null
constraint PK_Category primary key clustered,
[Name] nvarchar(100) not null
)
-- Comments ...
create table dbo.Comments
(
CommentID uniqueidentifier not null
constraint PK_Comment primary key clustered,
AuthorID uniqueidentifier not null,
Title nvarchar(400) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
constraint FK_Comments_Users
foreign key(AuthorID)
references dbo.Users(UserID)
)
-- Ratings ...
create table dbo.Ratings
(
RatingID uniqueidentifier not null
constraint PK_Rating primary key clustered,
AuthorID uniqueidentifier not null,
Value float not null,
constraint FK_Ratings_Users
foreign key(AuthorID)
references dbo.Users(UserID)
)
-- Tags ...
create table dbo.Tags
(
TagID uniqueidentifier not null
constraint PK_Tag primary key clustered,
[Name] nvarchar(100) not null
)
-- Views ...
create table dbo.Views
(
ViewID uniqueidentifier not null
constraint PK_View primary key clustered,
Ticket [datetime] not null
)
-- Blogs ...
create table dbo.Blogs
(
BlogID uniqueidentifier not null
constraint PK_Blog primary key clustered,
Title nvarchar(400) null,
Description nvarchar(2000) null,
CreatedDate datetime null
)
-- Posts ...
create table dbo.Posts
(
PostID uniqueidentifier not null
constraint PK_Post primary key clustered,
BlogID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nchar(1000) null,
Body nvarchar(max) null,
UpdatedDate datetime not null,
IsPublished bit not null,
constraint FK_Posts_Blogs
foreign key(BlogID)
references dbo.Blogs(BlogID)
on delete cascade,
constraint FK_Posts_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade
)
-- PostsCategories ...
create table dbo.PostsCategories
(
PostID uniqueidentifier not null,
CategoryID uniqueidentifier not null,
constraint PK_PostsCategories
primary key clustered (PostID, CategoryID),
constraint FK_PostsCategories_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsCategories_Categories
foreign key(CategoryID)
references dbo.Categories(CategoryID)
)
-- PostsComments ...
create table dbo.PostsComments
(
PostID uniqueidentifier not null,
CommentID uniqueidentifier not null,
constraint PK_PostsComments
primary key clustered (PostID, CommentID),
constraint FK_PostsComments_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsComments_Comments
foreign key(CommentID)
references dbo.Comments(CommentID)
on delete cascade
)
-- PostsRatings ...
create table dbo.PostsRatings
(
PostID uniqueidentifier not null,
RatingID uniqueidentifier not null,
constraint PK_PostsRatings
primary key clustered (PostID, RatingID),
constraint FK_PostsRatings_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsRatings_Ratings
foreign key(RatingID)
references dbo.Ratings(RatingID)
on delete cascade
)
-- PostsTags ...
create table dbo.PostsTags
(
PostID uniqueidentifier not null,
TagID uniqueidentifier not null,
constraint PK_PostsTags
primary key clustered (PostID, TagID),
constraint FK_PostsTags_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsTags_Tags
foreign key(TagID)
references dbo.Tags(TagID)
)
-- PostsViews ...
create table dbo.PostsViews
(
PostID uniqueidentifier not null,
ViewID uniqueidentifier not null,
constraint PK_PostsViews
primary key clustered (PostID, ViewID),
constraint FK_PostsViews_Posts
foreign key(PostID)
references dbo.Posts(PostID)
on delete cascade,
constraint FK_PostsViews_Views
foreign key(ViewID)
references dbo.Views(ViewID)
on delete cascade
)
-- Folders ...
create table dbo.Folders
(
FolderID uniqueidentifier not null
constraint PK_Folder primary key clustered,
[Name] nvarchar(100) null,
Description nvarchar(2000) null,
CreatedDate datetime not null,
URL nvarchar(400) not null
)
-- Files ...
create table dbo.Files
(
FileID uniqueidentifier not null
constraint PK_File primary key clustered,
FolderID uniqueidentifier not null,
AuthorID uniqueidentifier not null,
Title nvarchar(400) null,
Description nvarchar(2000) null,
[Name] nvarchar(100) not null,
URL nvarchar(400) not null,
UpdatedDate datetime not null,
IsPublished bit not null,
Type nvarchar(50) null,
constraint FK_Files_Folders
foreign key(FolderID)
references dbo.Folders(FolderID)
on delete cascade,
constraint FK_Files_Users
foreign key(AuthorID)
references dbo.Users(UserID)
on delete cascade
)
-- FilesCategories ...
create table dbo.FilesCategories
(
FileID uniqueidentifier not null,
CategoryID uniqueidentifier not null,
constraint PK_FilesCategories
primary key clustered (FileID, CategoryID),
constraint FK_FilesCategories_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesCategories_Categories
foreign key(CategoryID)
references dbo.Categories(CategoryID)
)
-- FilesComments ...
create table dbo.FilesComments
(
FileID uniqueidentifier not null,
CommentID uniqueidentifier not null,
constraint PK_FilesComments
primary key clustered (FileID, CommentID),
constraint FK_FilesComments_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesComments_Comments
foreign key(CommentID)
references dbo.Comments(CommentID)
on delete cascade
)
-- FilesRatings ...
create table dbo.FilesRatings
(
FileID uniqueidentifier not null,
RatingID uniqueidentifier not null,
constraint PK_FilesRatings
primary key clustered (FileID, RatingID),
constraint FK_FilesRatings_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesRatings_Ratings
foreign key(RatingID)
references dbo.Ratings(RatingID)
on delete cascade
)
-- FilesTags ...
create table dbo.FilesTags
(
FileID uniqueidentifier not null,
TagID uniqueidentifier not null,
constraint PK_FilesTags
primary key clustered (FileID, TagID),
constraint FK_FilesTags_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesTags_Tags
foreign key(TagID)
references dbo.Tags(TagID)
)
-- FilesViews ...
create table dbo.FilesViews
(
FileID uniqueidentifier not null,
ViewID uniqueidentifier not null,
constraint PK_FilesViews
primary key clustered (FileID, ViewID),
constraint FK_FilesViews_Files
foreign key(FileID)
references dbo.Files(FileID)
on delete cascade,
constraint FK_FilesViews_Views
foreign key(ViewID)
references dbo.Views(ViewID)
on delete cascade
)
-- Run script
goOn Oct 22, 12:21 am, shapper <mdmo...@.gmail.com> wrote:
> Hello,
> I am creating a database where:
> - I have a Blogs and Folders system.
> - Use a common design so I can implement new systems in the future.
> Users, Comments, Ratings, View, Tags and Categories are tables common
> to all systems, i.e., used by Posts and Files in Blogs and Folders.
> - One Tag or Category can be associated to many Posts or Files.
> - One Comment, View or Rating should be only associated to one Post or
> one File. I am missing this ... (1)
> Relations between a File / Folder and Comments / Ratings / View /
> Tags / Categories are done using FilesRatings, FoldersViews, etc.
> I am using UniqueIdentifier as Primary Keys.
> I checked ASP.NET Membership tables, a few articles and few features
> in my project, such as renaming files with the GUID of their records.
> I didn't decided yet for INT or UNIQUEIDENTIFIER.
> I am looking for some feedback on the design of my database.
> One thing I think need to improve is mentioned in (1)
> But any advices to improve it would be great.
> Thank You,
> Miguel
> My Database Script:
> -- Users ...
> create table dbo.Users
> (
> UserID uniqueidentifier not null
> constraint PK_User primary key clustered,
> [Name] nvarchar(200) not null,
> Email nvarchar(200) null,
> UpdatedDate datetime not null
> )
> -- Categories ...
> create table dbo.Categories
> (
> CategoryID uniqueidentifier not null
> constraint PK_Category primary key clustered,
> [Name] nvarchar(100) not null
> )
> -- Comments ...
> create table dbo.Comments
> (
> CommentID uniqueidentifier not null
> constraint PK_Comment primary key clustered,
> AuthorID uniqueidentifier not null,
> Title nvarchar(400) null,
> Body nvarchar(max) null,
> UpdatedDate datetime not null,
> constraint FK_Comments_Users
> foreign key(AuthorID)
> references dbo.Users(UserID)
> )
> -- Ratings ...
> create table dbo.Ratings
> (
> RatingID uniqueidentifier not null
> constraint PK_Rating primary key clustered,
> AuthorID uniqueidentifier not null,
> Value float not null,
> constraint FK_Ratings_Users
> foreign key(AuthorID)
> references dbo.Users(UserID)
> )
> -- Tags ...
> create table dbo.Tags
> (
> TagID uniqueidentifier not null
> constraint PK_Tag primary key clustered,
> [Name] nvarchar(100) not null
> )
> -- Views ...
> create table dbo.Views
> (
> ViewID uniqueidentifier not null
> constraint PK_View primary key clustered,
> Ticket [datetime] not null
> )
> -- Blogs ...
> create table dbo.Blogs
> (
> BlogID uniqueidentifier not null
> constraint PK_Blog primary key clustered,
> Title nvarchar(400) null,
> Description nvarchar(2000) null,
> CreatedDate datetime null
> )
> -- Posts ...
> create table dbo.Posts
> (
> PostID uniqueidentifier not null
> constraint PK_Post primary key clustered,
> BlogID uniqueidentifier not null,
> AuthorID uniqueidentifier not null,
> Title nchar(1000) null,
> Body nvarchar(max) null,
> UpdatedDate datetime not null,
> IsPublished bit not null,
> constraint FK_Posts_Blogs
> foreign key(BlogID)
> references dbo.Blogs(BlogID)
> on delete cascade,
> constraint FK_Posts_Users
> foreign key(AuthorID)
> references dbo.Users(UserID)
> on delete cascade
> )
> -- PostsCategories ...
> create table dbo.PostsCategories
> (
> PostID uniqueidentifier not null,
> CategoryID uniqueidentifier not null,
> constraint PK_PostsCategories
> primary key clustered (PostID, CategoryID),
> constraint FK_PostsCategories_Posts
> foreign key(PostID)
> references dbo.Posts(PostID)
> on delete cascade,
> constraint FK_PostsCategories_Categories
> foreign key(CategoryID)
> references dbo.Categories(CategoryID)
> )
> -- PostsComments ...
> create table dbo.PostsComments
> (
> PostID uniqueidentifier not null,
> CommentID uniqueidentifier not null,
> constraint PK_PostsComments
> primary key clustered (PostID, CommentID),
> constraint FK_PostsComments_Posts
> foreign key(PostID)
> references dbo.Posts(PostID)
> on delete cascade,
> constraint FK_PostsComments_Comments
> foreign key(CommentID)
> references dbo.Comments(CommentID)
> on delete cascade
> )
> -- PostsRatings ...
> create table dbo.PostsRatings
> (
> PostID uniqueidentifier not null,
> RatingID uniqueidentifier not null,
> constraint PK_PostsRatings
> primary key clustered (PostID, RatingID),
> constraint FK_PostsRatings_Posts
> foreign key(PostID)
> references dbo.Posts(PostID)
> on delete cascade,
> constraint FK_PostsRatings_Ratings
> foreign key(RatingID)
> references dbo.Ratings(RatingID)
> on delete cascade
> )
> -- PostsTags ...
> create table dbo.PostsTags
> (
> PostID uniqueidentifier not null,
> TagID uniqueidentifier not null,
> constraint PK_PostsTags
> primary key clustered (PostID, TagID),
> constraint FK_PostsTags_Posts
> foreign key(PostID)
> references dbo.Posts(PostID)
> on delete cascade,
> constraint FK_PostsTags_Tags
> foreign key(TagID)
> references dbo.Tags(TagID)
> )
> -- PostsViews ...
> create table dbo.PostsViews
> (
> PostID uniqueidentifier not null,
> ViewID uniqueidentifier not null,
> constraint PK_PostsViews
> primary key clustered (PostID, ViewID),
> constraint FK_PostsViews_Posts
> foreign key(PostID)
> references dbo.Posts(PostID)
> on delete cascade,
> constraint FK_PostsViews_Views
> foreign key(ViewID)
> references dbo.Views(ViewID)
> on delete cascade
> )
> -- Folders ...
> create table dbo.Folders
> (
> FolderID uniqueidentifier not null
> constraint PK_Folder primary key clustered,
> [Name] nvarchar(100) null,
> Description nvarchar(2000) null,
> CreatedDate datetime not null,
> URL nvarchar(400) not null
> )
> -- Files ...
> create table dbo.Files
> (
> FileID uniqueidentifier not null
> constraint PK_File primary key clustered,
> FolderID uniqueidentifier not null,
> AuthorID uniqueidentifier not null,
> Title nvarchar(400) null,
> Description nvarchar(2000) null,
> [Name] nvarchar(100) not null,
> URL nvarchar(400) not null,
> UpdatedDate datetime not null,
> IsPublished bit not null,
> Type nvarchar(50) null,
> constraint FK_Files_Folders
> foreign key(FolderID)
> references dbo.Folders(FolderID)
> on delete cascade,
> constraint FK_Files_Users
> foreign key(AuthorID)
> references dbo.Users(UserID)
> on delete cascade
> )
> -- FilesCategories ...
> create table dbo.FilesCategories
> (
> FileID uniqueidentifier not null,
> CategoryID uniqueidentifier not null,
> constraint PK_FilesCategories
> primary key clustered (FileID, CategoryID),
> constraint FK_FilesCategories_Files
> foreign key(FileID)
> references dbo.Files(FileID)
> on delete cascade,
> constraint FK_FilesCategories_Categories
> foreign key(CategoryID)
> references dbo.Categories(CategoryID)
> )
> -- FilesComments ...
> create table dbo.FilesComments
> (
> FileID uniqueidentifier not null,
> CommentID uniqueidentifier not null,
> constraint PK_FilesComments
> primary key clustered (FileID, CommentID),
> constraint FK_FilesComments_Files
> foreign key(FileID)
> references dbo.Files(FileID)
> on delete cascade,
> constraint FK_FilesComments_Comments
> foreign key(CommentID)
> references dbo.Comments(CommentID)
> on delete cascade
> )
> -- FilesRatings ...
> create table dbo.FilesRatings
> (
> FileID uniqueidentifier not null,
> RatingID uniqueidentifier not null,
> constraint PK_FilesRatings
> primary key clustered (FileID, RatingID),
> constraint FK_FilesRatings_Files
> foreign key(FileID)
> references dbo.Files(FileID)
> on delete cascade,
> constraint FK_FilesRatings_Ratings
> foreign key(RatingID)
> references dbo.Ratings(RatingID)
> on delete cascade
> )
> -- FilesTags ...
> create table dbo.FilesTags
> (
> FileID uniqueidentifier not null,
> TagID uniqueidentifier not null,
> constraint PK_FilesTags
> primary key clustered (FileID, TagID),
> constraint FK_FilesTags_Files
> foreign key(FileID)
> references dbo.Files(FileID)
> on delete cascade,
> constraint FK_FilesTags_Tags
> foreign key(TagID)
> references dbo.Tags(TagID)
> )
> -- FilesViews ...
> create table dbo.FilesViews
> (
> FileID uniqueidentifier not null,
> ViewID uniqueidentifier not null,
> constraint PK_FilesViews
> primary key clustered (FileID, ViewID),
> constraint FK_FilesViews_Files
> foreign key(FileID)
> references dbo.Files(FileID)
> on delete cascade,
> constraint FK_FilesViews_Views
> foreign key(ViewID)
> references dbo.Views(ViewID)
> on delete cascade
> )
> -- Run script
> go
Please, anyone?
Does someone sees a way to improve this?
Thanks,
Miguel