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Re: Lazy summer project: build a basketball app.

From: <kvnkrkptrck_at_gmail.com>
Date: 29 Jun 2006 13:49:56 -0700
Message-ID: <1151614196.226838.290870@x69g2000cwx.googlegroups.com>

Bob Badour wrote:
> kvnkrkptrck_at_gmail.com wrote:
>
> > All, it's been a long time since I've done a from scratch database
> > design. What follows is a shameless appeal for anyone with some
> > database design expertise, a few extra minutes, and desire to help out
> > - to offer any criticisms/advice they see fit. I'll conclude the
> > opening paragraph with an apology to those without said expertise, few
> > extra minutes, or desire to help; for the time wasted on reading the
> > opening paragraph (and a suggestion to read no further/waste no further
> > time).
> >
> > My dad is a huge D3 college basketball fan, and during the season, he
> > attempts to keep daily tabs on the entire division (hundreds of teams).
> > Last year, he approached me for help. He'd been using dozens of Excel
> > sheets to track the games, and was having tremendous difficulties
> > keeping up. Data entry was a nightmare - all games needed to be
> > modified in two places (once for each team). Due to lack of data
> > integrity, his sheets were riddled with errors/typos. And reporting
> > was even worse - he spent hours each weekend manually sorting sheets,
> > summing functions, etc., in order to answer such simple questions as
> > "Which team has the best record", and "Next weekend, are there any
> > undefeated teams playing each other".
> >
> > Anyway, at the time, I helped him out by writing some ugly Excel macros
> > for data synchronization (allowing him to enter a score once and have
> > it posted in both places) - but it was conditioned on his promise to
> > let me design a relational database for the next season.
> >
> > So here I sit - it's been a long time since I've done a from-scratch
> > relational design, but it's a slow afternoon, so I figured I'd start
> > some ER planning.
> >
> > I start with a Team entity, with each team having a division attribute
> > (1, 2, or 3), a conference attribute, a college name, a shorthand name
> > / abbreviation, and a city/state (pk will be division, conference,
> > college name). I can hand this entity over to my dad right now, and he
> > can start populating it. But I'm getting a bit stuck on the next step.
> >
> >
> > At first, I thought, I'll need a simple Game relation. But I think
> > this will need to be a super relation of sorts - because certain
> > attributes of tournament games are different than non-tournament games
> > (e.g. existence of a home/away team; existence of the name of the
> > tournament; a tournament round number; etc.).
> >
> > Another odd characteristic of the Game relation is that I can't come up
> > with a decent natural key while retaining symmetry of opponents (team A
> > vs. team B == team B vs. team A).
> > If I recall correctly, in a game between some team1 and team2, both
> > (Game Date, Team1) and (Game Date, Team2) are viable candidates - no
> > team will ever play two games on the same day. But I'd have to break
> > the symmetry in order to get a natural key (I think).
> >
> > So, I'm now leaning towards introducing an artificial Game entity with
> > a surrogate Game_id, e.g. <Game_id(pk), scheduled date>, and also
> > introducing a Opponent relation <Game ID (pk / fk on Game), Team (pk /
> > fk on Team), Points scored, ...>. I'd have to enforce some
> > application-level constraints (e.g. each game_id must exist exactly two
> > times in Opponent (if at all)), but it does keep a nice symmetry.
> >
> > Anyway, I've got ample time to think this one through - and my thought
> > is "if I build this right the first time, I can design some front-ends
> > for data loading, some views for data extraction, etc..., and my dad
> > might have a nice toy to play with for years to come".
> >
> > So, having said that - I'm open to any design advice or criticisms
> > anyone may have to offer. My best idea right now:
> > Team <division, conference, college, a shorthand name, city, state>
> > Game <Game_id (pk), Date>
> > TourneyGame <Game_id (pk - fk on Game.Game_id), Tournament_name,
> > round_number>
> > NonTourneyGame <Game_id (pk - fk on Game.Game_id)>
> > TourneyOpponent <Game_id (pk - fk on TourneyGame.game_id), Team_fk
> > (pk), Points_Scored>
> > NonTourneyOppenent <Game_id (pk - fk on NonTourneyGame.game_id),
> > Team_fk (pk), Home_Away_Ind, Points_scored>
>
> What about forfeits? Or does college basketball not have forfeits?
>

I don't think forfeits are an issue - although games can certainly be cancelled or rescheduled due to inclemental weather (one more argument, I suppose, for avoiding Game_Date as part of a key - if a game between A and B changes from the 1st to the 2nd of Sep, is it a different game?  I think not.). I'll ask to be sure.

> Do all teams have a home court? If so, when a tournament game is played
> at the home court of one of the teams, is that team not a home team? Is
> a team ever considered the home team when playing at a different court?
>
> Does college basketball have anything like a pre-season or exhibition game?
>

In his spreadsheet, he used "A", "H" or "T" for this column... I don't see a single instance of "AT" or "HT", so my guess is that he'd consider a team as neither home nor away, even if it was playing in a tournament hosted on its own court. I'll ask him, though, if he'd like the ability to specify a team in a tournament as "home" if it is hosting the tournament and away otherwise.

> What are the requirements your father has?
The requirements are inferred from the types of facts he included on his spreadsheets from last season. My idea was to build a basic model, asking questions as I go along. But my "high-order" goal is to deliver something that lets him track the same facts he'd tracked last season, but taking advantage of a relational foundation so I can quickly and easily build on it data entry forms, queries, reports, etc.

I wion't get into how long it took me to write the stupid error-prone score synchronization Excel macro, but all I could think was, "This should *not* be this hard"... Received on Thu Jun 29 2006 - 15:49:56 CDT

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