Plot Table Relationships

Jan 26, 2004

Hello,

I am looking to print the table structure of a Microsoft SQL Server 7 database through the Enterprise Manager Utility. I would like to print it to a plotter but the print options in the Enterprise Manager are inadequate. I believe I will need to use another program to manipulate the object prior to plot due to its size. I have the following tools available:

VB6
Autocad
(Do not have Adobe Writer)

Is there a way to get this print object to Autocad or even as a bitmap?

Thanks is advance,
bds

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Hi,
I'm working on a database for which I require to have a lot of relations from my Persons table to other tables. I will need my primary key in those other tables: about 10 to 15 tables, to be able to relate to my persons data.

I believe this means I have 10 to 15 clustered indexes on this table.
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I have spend days researching this and found others with the exact same
problem but there are no useful replies as people don't seem to
understand our problem. Please read this carefully...


What is the best way to create relationships between new SQL tables? For example, say I want to create a new database with tables for Customer, Orders and Details, how to I relate these tables?

- Edit via the Dataset designer in Visual Studio 2005?
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Packagename



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JobID



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JobID

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Hello again,

I'm going through my tables and rewriting them so that I can create relationship-based constraints and create foreign keys among my tables. I didn't have a problem with a few of the tables but I seem to have come across a slightly confusing hiccup.

Here's the query for my Classes table:

Code:

CREATE TABLE Classes
(
class_id
INT
IDENTITY
PRIMARY KEY
NOT NULL,

teacher_id
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class_title
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class_grade
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class_tardies
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class_absences
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)

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Code:

CREATE TABLE Classes_have_Grades
(
class_id
INT
PRIMARY KEY
NOT NULL,

teacher_id
INT
NOT NULL,

grade_id
INT
NOT NULL,

CONSTRAINT Grades_for_ClassesFKIndex1 FOREIGN KEY (grade_id)
REFERENCES Grades (grade_id),

CONSTRAINT Classes_have_gradesFKIndex2 FOREIGN KEY (class_id, teacher_id)
REFERENCES Classes (class_id, teacher_id)
)

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2
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http://foo.gearsector.com/foo/instr_scrns/oneToMany.gif


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Hello!



I have a really small database in terms of number of objects, but very big in terms of data (possibly millions of records). I always try to design my databases to be in the 3rd normal form (at least I hope they are!), but sometimes (for databases consisting of just a few tables) maintaining M:N relationships looks like an over-bloated approach to me... Let's see an actual example. I have a table like this:






Code SnippetCreate table [Airfares]
(
[OriginCity] Char(3) NOT NULL,
[DestCity] Char(3) NOT NULL,
[FareDate] Datetime Default getdate() NOT NULL,
[Price] Decimal(9,2) Default 0 NOT NULL,
[PriceChange] Decimal(9,2) Default 0 NOT NULL,
[Wrong] Bit Default 0 NOT NULL,
Primary Key ([OriginCity],[DestCity],[FareDate])
)
go







Now, at first there also was an Airline nvarchar(50) field, which stored the airline name. But now the client requested to store fares for a few airlines if it's the same price and city pair. This way we can have 3 airlines offering the same price on the same itinerary for example. So I added a dictionary table called Airlines:






Code SnippetCreate table [Airlines]
(
[AirlineCode] Char(2) NOT NULL,
[Name] Nvarchar(50) NOT NULL,
Primary Key ([AirlineCode])
)
go







Now, there are two things I can do. We are obviously dealing with the M:N relationship type here. I can either add another nvarchar column in the first table, like Airlines nvarchar(255) and store something like 'AA,AB,AC' there - those would be airline codes. OR I could do it the proper way and create a cross-reference table which will connect both Airfares and Airlines tables (this will store as many records as there are airlines for that particular itinerary, offerring the same price):






Code SnippetCreate table [AirfareAirlines]
(
[AirlineCode] Char(2) NOT NULL,
[OriginCity] Char(3) NOT NULL,
[DestCity] Char(3) NOT NULL,
[FareDate] Datetime Default getdate() NOT NULL,
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)
go







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