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February 13, 2015 23:19
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byteblast created this gist
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,88 @@ USE [Master]; IF DB_ID('Prototype') IS NOT NULL DROP DATABASE Prototype; CREATE DATABASE Prototype; USE Prototype; CREATE TABLE dbo.Users ( userid INT IDENTITY(1, 1) PRIMARY KEY, username NVARCHAR(100) NOT NULL ); CREATE TABLE dbo.Tweets ( tweetid INT IDENTITY(1, 1) PRIMARY KEY, [text] NVARCHAR(140) NOT NULL, userid INT NOT NULL CONSTRAINT FK_Tweets_Users FOREIGN KEY(userid) REFERENCES dbo.Users(userid) ); CREATE TABLE dbo.Follows ( followerid INT NOT NULL, followeeid INT NOT NULL, CONSTRAINT FK_Follows_FollowerId FOREIGN KEY(followerid) REFERENCES dbo.Users(userid), CONSTRAINT FK_Follows_FolloweeId FOREIGN KEY(followeeid) REFERENCES dbo.Users(userid), CONSTRAINT Pk_FollowsPk PRIMARY KEY (followerid, followeeid) ); INSERT INTO dbo.Users VALUES ('Alex') INSERT INTO dbo.Users VALUES ('Jon') INSERT INTO dbo.Users VALUES ('Ignace') INSERT INTO dbo.Tweets VALUES ('This is my second Tweet.', 1), ('Noda Time is cool.', 2), ('C# 6.0. Woot.', 2), ('Material = Success.', 3), -- Feature 1: Make 'Alex' follow 'Jon' INSERT INTO dbo.Follows VALUES (1, 2); -- Make 'Ignace' follow 'Jon; INSERT INTO dbo.Follows VALUES (3, 2); -- Make 'Ignace' follow 'Alex' also INSERT INTO dbo.Follows VALUES (3, 1); -- Feature 2: List followers of 'Jon' SELECT username FROM dbo.Follows f JOIN dbo.Users u ON u.userid = f.followerid WHERE followeeid = 2 -- Feature 3: Calculate follower count of 'Jon' SELECT COUNT(*) As FollowerCount FROM dbo.Follows f JOIN dbo.Users u ON u.userid = f.followeeid WHERE u.userid = 2 -- Feature 4: List people who 'Ignace' follows SELECT u.username FROM dbo.Follows f JOIN dbo.Users u on u.userid = f.followeeid WHERE f.followerid = 3 -- Feature 5: Get home page list for user 'Ignace' SELECT t.[text], u.username FROM dbo.Tweets t JOIN dbo.Users u ON u.userid = t.tweetid WHERE u.userid IN (SELECT u.userid FROM dbo.Follows f JOIN dbo.Users u on u.userid = f.followeeid WHERE f.followerid = 3 UNION SELECT 3)