We will learn what a relational database is, how it works, and why you might choose it over NoSQL alternatives.
What is Database Understand Databases and Relationships Database Relationships 11m 35s Primary Key 6m 50s Unique Key 3m 34s Foreign Key 4m 2s Difference between PK, UK and PK & FK 6m 6s SQL Installation Steps Steps in SQL For Database Creation SQL Constraints & Alias SQL Sele...
or pulled from that database. Schema-on-read systems tend to be more flexible, as you can store unstructured data without worrying about it conforming to a rigid data model. In this case, writing data is faster (since that data doesn’t need to be verified as it gets loaded in), but...
Learn what is a database schema, what are its components, how it works, what are its benefits and some basic rules that apply to database schemas.
Also known as PK, a primary key is a special kind of entity attribute thatuniquely defines a record in a database table. In other words, there must not be two (or more) records that share the same value for the primary key attribute. The ERD example below shows an entity 'Product' ...
The quickest path to understanding relational databases and how you can best use them is to dissect a database into its specific components. These are the basic building blocks of any relational database, whether for a simple use case or to run your enti
New in Oracle Database 12c are: 1. Interval Reference Partitioning 2. Cascading TRUNCATE and EXCHANGE Operations 3. Moving Partitions Online 4. Maintaining Multiple Partitions 5. Maintaining Global Indexes Asynchronously 6. Using Partial Indexes Hardware and Software Requirements The following is a list...
A foreign key (FK) is a column or combination of columns used to create a relationship between two tables. When a PK is referenced in another table, it is called a foreign key on the referenced table. Learn more about theDifference between Primary Keys and Foreign Keys. ...
However, there are situations – e.g. when we need to interact with external systems – where using a key generated in our database is a bad approach. For those scenarios, it is usually better to use natural keys, which are unique values that are part of the entity being stored and ar...
Generated names for foreign keys.NDBnow uses the patterntbl_name_fk_Nfor naming internally generated foreign keys. This is similar to the pattern used byInnoDB. Schema and metadata distribution and synchronization.NDB 8.0 makes use of the MySQL data dictionary to distribute schema information to SQ...