3. What are some examples of secondary data? External secondary data Before we get to examples of secondary data, we first need to understand the types of organizations that generally provide them. Frequent sources of secondary data include: Government departments Public sector organizations Industry...
Here are some examples of data sources in action. Various databases are examples of data sources. Consider a shoe brand that sells things online. The website uses data from a stock database to determine if a product is out of stock. The stock records are a data source in this scenario,...
We now have a collection of 4 tables named t1,t2,t2, and t4. They can be called a “related collection” because we can clearly find out that there are some common attributes existing in a selected pair of tables. Because of these common attributes, we may combine the data of two or ...
This refers to the physical devices, including the computer itself, that are used to store the data. Some examples of hardware used in a DBMS include: Computer Hard disks I/O channels 2. Software The software component of a DBMS refers to the computer programs used to manage the database....
NoSQL databases are useful for a large set of distributed data. Some examples of NoSQL database system with their category are: MongoDB, CouchDB, Cloudant(Document-based) Memcached, Redis, Coherence(key-value store) HBase, Big Table, Accumulo(Tabular) ...
Many-to-many: When more than one instance of an entity on the left and more than one instance of an entity on the right can be linked with the relationship, then it is termed as N:N relationship. Here are some examples: One to one ...
There are two scenario's I can think of that relax this unequivocal position a bit. One is if the user says that some attribute of type 'video' or 'audio' (or some such) is to be unique. It may be infeasible to actually enforce that, and it is the designer's responsibility to poi...
Here are some examples of information a data model might include: Product data Partner information Customer data Data Catalogs Data catalogs are inventories of data resources within a business. They usually use metadata to organize these resources. A data ca...
A DBMS provides appropriate language to users to help query databases and updates. It essentially creates and maintains the database. Some examples of database languages are SQL, Oracle, dBase, MS Access, FoxPro etc. Database languages are commonly divided into Data Definition Language (DDL), Da...
What Are Databases Used For? Lesson Summary Additional Activities Modified True or False Exercise on Databases Exercise Check your knowledge of the lesson on the examples and types of databases by determining whether the following statements are true or false. For this activity, print or copy this...