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I'm trying to use the Relationships dialog in SQL 2008 to add a new foreign key to a table field. When I go to add one, I am not able to change and specify the Foreign Key Base table or any others in the "Tables and Columns Specification" area...they'...
Answer Snippets (Read the full thread at stackoverflow):
ALTER TABLE dbo.MyTable ADD CONSTRAINT FK1_MyTable FOREIGN KEY(myNewColum) REFERENCES dbo.myRefTable(ID.
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I've created a table in MySQL:
CREATE TABLE actions ( A_id int NOT NULL AUTO_INCREMENT, type ENUM('rate','report','submit','edit','delete') NOT NULL, Q_id int NOT NULL, U_id int NOT NULL, date DATE NOT NULL, time TIME NOT NULL, rate tinyint(1), PRIMARY...
Started by stalepretzel on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
In MySQL, " KEY....
It silently accepts the declaration of a foreign key, but does not store the constraint or enforce for the foreign key.
I would guess that your default storage engine is MyISAM, which ignores foreign key constraints.
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I'm mapping a legacy database with nhibernate and having some problems with mapping a realation.
The two classes look like this
public class Questionnaire { public int Id {get; set;} public string FormCode {get; set;} public IList<Question> Questions...
Started by Colin G on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Is ID.
But, as you're witnessing, that's not always the case.
foreign keys should be primary keys.
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Ask your Facebook Friends
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I have the following tables:
Financial :
PK_FinancialID FK_SchoolID School :
PK_SchoolID Class :
PK_ClassID FK_SchoolID ClassName Both Class and Financial have Foreign Key relationships to School. I want to make a query that would show all classes that...
Started by Yaakov Ellis on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
As far as performance goes: I'm not really sure, but I'd say it would be faster because you have one less table to join - but I'm not an expert in that area.... .
Don't see anything wrong with that.
I'd say you're fine to leave out the actual school table .
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Foreigner - FOREIGNER [DVD-A] Please post your thoughts and comments on the DVD-A :thumbsdow
Started by JonUrban on
, 25 posts
by 19 people.
Answer Snippets (Read the full thread at quadraphonicquad):
I gave it a 1....
I was shocked at how good the songs were, and the surround mix is very good .
But was very glad i bought this one.
Re: Foreigner - FOREIGNER [DVD-A] I was never a Foreigner fan, and had never bought any of thier CD's.
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I have a Staff and e SecuredPage entity and the properties are below
Staff id Name LastName Level // SecuredPage.RoleId
SecuredPage id PageId RoleId // Staff.Level
I want to have a collection of SecuredPage in Staff entity, so it s a one-to-many but i...
Started by Barbaros Alp on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
I know this doesn't sound like what you wanted to hear (as you said you didn't create a Role entity) but you may want to consider... .
In reality, that is an expression of a many-to-many relationship .
I think the problem is that it's not really a one to many .
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I know some aspects that could make you marry a foreigner or getting married far a way from your birth place:
Are there other aspects besides this ones?
-ruler of the 7th in the 9th
-Ruler of the 9th in the 7th
-Ruler of the 7th in Sagittarius.
Other ...
Started by virgo18 on
, 19 posts
by 10 people.
Answer Snippets (Read the full thread at astrologyweekly):
Remember, the sun, because if you live....
My chart ruler, neppy will be much more open to new experiences and therefore easier marry a foreign person.
With 'foreigners' and in a 'foreign land', but i have none of the indicators above.
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I have a table T with a primary key id and foreign key f. Is f automatically indexed when it is specified as a foreign key? Do I need explicitly add an index for f ?
Started by Byron Whitlock on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
In SQL Server.
Questions/278982/are-foreign-keys-indexed-automatically-in-sql-server
Hi
In case of the foreign key constraint, the foreign key f in table T would be a primary key in the referenced table say T2.
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What is the name for the technique of using a set of foreign keys in a table where all but one are NULL for a given row?
In other words, each row needs a foreign key to one (and only one) of n different possible tables so you actually have all the necessary...
Started by James Tauber on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Instead, I prefer to make one foreign for polymorphic associations:
Possible to do a MySQL foreign key to one of two possible tables? Referencing foreign keys in the same....
The term for the design you're describing is Exclusive Arc .
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How do I index a foreign key in Oracle?
Started by Ajay on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
You cannot index the foreign key constraint itself, but you can index the columns the foreign key is defined....
NOT NULL) ALTER TABLE mytable ADD CONSTRAINT fk_mytable_ref_reftable FOREIGN KEY (ref) REFERENCES it already has an index.
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