copy and paste this google map to your website or blog!
Press copy button and paste into your blog or website.
(Please switch to 'HTML' mode when posting into your blog. Examples: WordPress Example, Blogger Example)
Input Form:Deal with this potential dealer,buyer,seller,supplier,manufacturer,exporter,importer
(Any information to deal,buy, sell, quote for products or service)
Differences between foreign key and constraint foreign key I mean for example I can create table like create table XTable ( idt int not null primary key, value nvarchar(50), idq int, constraint fk_idq foreign key(idq) references YTable(idq) ) and
foreign key constraint naming scheme - Stack Overflow What is a standard naming scheme to use for foreign key constraints? Given these tables task (id, userid, title) note (id, taskid, userid, note); user (id, name) where Tasks have Notes, Tasks are
Does a foreign key automatically create an index? An FK-relationship will often need to look up a relating table and extract certain rows based on a single value or a range of values So it makes good sense to index any columns involved in an FK, but an FK per se is not an index Check out Kimberly Tripp's excellent article "When did SQL Server stop putting indexes on Foreign Key columns?"
What is a proper naming convention for MySQL FKs? The reason for creating a symbolic name is for referencing when you want need to drop the constraint Oracle SQL Server allow you to disable specific constraints If you don't have fk in the name, you have to confirm the constraint is a foreign key constraint
sql - Foreign Keys vs Joins - Stack Overflow Joins are defined using foreign keys only False! Using foreign key will better the performance Also false In fact, if anything, FK's can hurt performance, though only rarely to any noticeable degree that justifies removing then
How to find foreign key dependencies in SQL Server? How can I find all of the foreign key dependencies on a particular column? What are the different alternatives (graphically in SSMS, queries views in SQL Server, 3rd party database tools, code in
If Foreign Key Not Exist Then Add Foreign Key Constraint(Or Drop a . . . ALTER TABLE Products ADD FOREIGN KEY (BrandID) REFERENCES Brands(ID) But I need to only run this command if Foreign Key does not exist A similar thing I need is that drop a Foreign Key Constraint If Exist without using name
Whats the difference between having a required foreign key to a . . . Please tell us what information modeling reference you are using Why do you think you care about a "difference"? A subrow value is a PK or FK when it appears in a PK or FK column list PK FK column list declarations say things about what table values can arise We declare them so the DBMS enforces them We don't need them to query (Some collections of declarations enforce others, that we