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I heard that SQL is faster if table relationships are defined.
Is this true?
Or maybe it's slower, I would like to know.
Started by pixel3cs on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
This is also known....
My guess is that you're talking about foreign keys.
Indexes improve performance; referencial integrity (table relations) ensures the quality of data according to business requirements .
SQL is not faster if table relations are defined.
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HI There,
what are the possible ways in which i can maintain relationships across instances of databases . i know relationships across DB's is bad approach , but i have to do this way.
i am using SQL SERVER 2005.
Thanks DEE
Started by DEE on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
So that the tables you want to define a relationship with are available in your local database.
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I am looking for nosql key value stores that also provide for storing/maintaining relationships between stored entities. I know Google App Engine's datastore allows for owned and unowned relationships between entities. Does any of the popular nosql store...
Started by Ritesh M Nayak on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
The relationships in the Google App Engine are only keys to entities that are automatically de MongoDB, the relationships are stored in-object (from what I remeber), but they can also be stored however in the relationship in a similar....
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Where can I find a good Rails newbie-friendly reference about generating rails models with foreign key relationships?
I've found some pages indicating that you should add has _ many and belongs _ to to the relevant models to specify these relationships...
Started by Readonly on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
What are you expecting the....
"I'm not sure what you're driving at with your question .
To do? Create multi-object relationship links automatically? That's something you have to start relationships are going to look like in the application.
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I have a couple of mdb files with the exact table structure. I have to change the primary key of the main table from autonumber to number in all of them, which means I have to:
Drop the all the relationships the main table has Change the main table Create...
Started by lamcro on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Change this to save to a file in whatever format you prefer (CSV, tab Debug.Print "Field: " & fld.Name Next End With Next End Function
This function will drop all the relationships .Relations.Delete Name....
The metadata for all relationships.
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I know how to create one to many, many to many relationships in SQL Server, but is it possible to create one to one relationship? And is it possible to create 1 to 0 or 1 relationship?
Started by ArsenMkrt on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
This makes 'B'....
Create an FK from the B PK to the PK of A .
Table A and B have both a PK.
Two ways: 1) a pk-pk 1:1 relationship.
The FOREIGN KEY from either table's definition, you change the corresponding part of the relationship A_REF.
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I'm looking for a tool that can map the relationships in my database in mysql. I would like something like the view that is generated in MS-SQL Server Management Studio in the 'Show Diagram Pane'. Does such a thing exist?
I'm in charge of the design of...
Started by Tilendor on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
One year ago I used.
Explicit FKs the best you can do is guess at the relationships between tables.
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How do the relationships magically function when only the models are altered?
If I want a "has__and___belongs___to__many" relationship, what should I name the table (so Rails can use it) that contains the two foreign keys?
Started by Abi Noda on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Since the relationship....
You add relationships to the model: has_many , belongs :bank_accounts ).
A relationship to another table, you have to create that column and name it in another predictable way output to figure out what the columns are.
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It seems to me that when you use relationships in Hibernate/JPA that using relationships like OneToMany can have a performance boost on reads because only one database call would need to be run to get a parent entity and all children entities. I want ...
Started by Benju on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
However, you can.
If you want to avoid relationships then you lose a significant advantage of JPA.
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Quick question here guys.
I'm working with an older database, which had no relationships adn am now trying to make it as consistent as possible.
the code that I'm porting had some quirks which led to some situations where I cannot enforce the relationship...
Started by Jan W. on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
In the absence....
The explicit relationships in SQL with explicit relationships, LINQ will be able to put a strongly-typed Orders collection (int or whatever) on the Order object.
You can add additional properties and functionality as necessary.
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