sql - What is the difference between a primary key and a surrogate key ...
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 PRIMARY KEY …
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 - 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 …
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 …
mysql - SQL keys, MUL vs PRI vs UNI - Stack Overflow
What is the difference between MUL, PRI and UNI in MySQL? I'm working on a MySQL query, using the command: desc mytable; One of the fields is shown as being a MUL key, others show up as UNI or P...
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. …
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.
MySQL DROP all tables, ignoring foreign keys - Stack Overflow
Mar 7, 2017 · How do I drop all tables from a MySQL database, ignoring any foreign key constraints?
SQL Server - Return value after INSERT - Stack Overflow
I'm trying to get a the key-value back after an INSERT-statement. Example: I've got a table with the attributes name and id. id is a generated value. INSERT INTO table (name) VALUES('bob'); ...