sql - What is the difference between a primary key and a surrogate key ...
Apr 21, 2016 · Within SQL Server, Microsoft allows you to define a column with an identity property to help generate surrogate key values. The PRIMARY KEY constraint uniquely identifies each record in …
sql - Foreign keys vs secondary keys - Stack Overflow
Jan 29, 2014 · The primary key will probably be implemented with a primary key constraint; the candidate keys will probably be implemented with unique constraints. A foreign key is an instance of …
How can I list all foreign keys referencing a given table in SQL Server ...
Jan 27, 2009 · I need to remove a highly referenced table in a SQL Server database. How can I get a list of all the foreign key constraints I will need to remove in order to drop the table? (SQL answers …
sql - How to list table foreign keys - Stack Overflow
Is there a way using SQL to list all foreign keys for a given table? I know the table name / schema and I can plug that in.
sql - When should I use primary key or index? - Stack Overflow
May 20, 2010 · Primary keys usually are automatically indexed - if you create a primary key, no need to create an index on the same column (s). When to use what Each table should have a primary key. …
sql - What are keys used for in MySQL? - Stack Overflow
Aug 26, 2011 · The most common keys are the Primary key and foreign key s and unique key s. A foreign key specifically relates the data of one table to data in another table. You might see that a …
Can I have multiple primary keys in a single table?
Oct 20, 2008 · Candidate keys are a fundamental concept in the relational data model. It's common practice, if multiple keys are present in one table, to designate one of the candidate keys as the …
sql server - Is it possible to list all foreign keys in a database ...
Aug 4, 2009 · SELECT * FROM sys.foreign_keys That is if you are on at least SQL Server 2005+ and want to see a list of the FK names. But you probably want to know more about the tables that are …
What is the difference between a primary key and an index key
Jun 21, 2024 · Keys are frequently good candidates for indexing and some DBMSs automatically create indexes for keys, but that doesn't have to be so. The phrase "index key" mixes these two quite …
How do you list the primary key of a SQL Server table?
Simple question, how do you list the primary key of a table with T-SQL? I know how to get indexes on a table, but can't remember how to get the PK.