In SQL, is it composite or compound keys?
Jun 2, 2011 · About SQL (Computing/Databases): When we have two or more fields in a table that, together, identify its records uniquely, what's the proper way of calling them? Composite …
database design - Are composite primary keys bad practice?
Oct 21, 2017 · I want to know if composite primary keys are bad practice and if not, in which scenarios is their use beneficial? My question is based on this article Note the part about …
Should a composite primary key out of 3-4 attributes or a unique ...
Dec 3, 2018 · Should a composite primary key out of 3-4 attributes or a unique artificial ID should be used for the situation below? Ask Question Asked 7 years, 1 month ago Modified 7 years, 1 …
Difference between surrogate key (s) and composite key (s)?
Apr 21, 2016 · A composite key is simply a key that contains two or more columns. A surrogate key is one which is not naturally unique to the data but is added or imposed onto the data for …
database design - Should I Use a Composite Key or a Single …
Jan 17, 2024 · I am considering two approaches to define the primary key for this table: Composite Key Approach: Using both database_tool and variantID as a composite primary …
database design - When to use unique composite keys?
Aug 31, 2017 · When creating a database structure, I tend to create unique composite keys for every group of data that needs to be unique. Beside them I usually use a primary key (usually …
Does using composite keys violate 2NF? - Database …
Aug 31, 2019 · A Product_Customer table, with the columns: CustomerProductID CustomerID ProductID Some say that primary key (CustomerProductID) is not needed and it should use …
Add composite primary key on existing PostgreSQL table
Mar 15, 2023 · There is no real difference between your existing unique constraint and a primary key. So why do you think you need the primary key?
Do you need to explicitly include the primary key in a composite …
Oct 31, 2023 · 4 I recently read that when creating a composite index in MariaDB that the primary key is appended to the end of the index "under the covers". I access my data many times in …
NULLs in a composite primary key - SQL Server
I'm trying to work out the best way of creating SQL Server primary keys, foreign keys and constraints to accurately represent my data model in LINQ / Entity Data Objects. Let's assume …