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 …
sql - What is the difference between a primary key and a surrogate …
Apr 21, 2016 · A surrogate key is typically a numeric value. Within SQL Server, Microsoft allows you to define a column with an identity property to help generate surrogate key values. The …
How can I find out what FOREIGN KEY constraint references a …
Jul 6, 2013 · Could not drop object 'dbo.UserProfile' because it is referenced by a FOREIGN KEY constraint. Msg 2714, Level 16, State 6, Line 2 There is already an object named 'UserProfile' …
How can I list all foreign keys referencing a given table in SQL …
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 …
SQL Server: Get table primary key using sql query
Oct 14, 2010 · SHOW KEYS FROM tablename WHERE Key_name = 'PRIMARY' What is equivalent of above query for SQL Server ?. If There is a query that will work for both MySQL …
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 …
How to retrieve the product key of a SQL Server installation from ...
Dec 20, 2018 · I have multiple versions of SQL and understand that product key registry paths changes for each version. We don't want to hard code the path, hence I'm searching for …
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 …
All versions SQL Server Registry Key - Stack Overflow
Jul 6, 2014 · The CurrentVersion key/value does persist through all editions of SQL Server beyond SQL 2005. There is a caveat to this though, it can in some instances differ to what …
sql server - sql primary key and index - Stack Overflow
Sep 17, 2020 · You can define a primary key in SQL Server 2012 by using SQL Server Management Studio or Transact-SQL. Creating a primary key automatically creates a …