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- Database design and SQL query
- Structure of XML data
- Relational databases
- Procedural extensions
- SQL and advanced SQL, MySQL, PL/SQL
- Database languages
- Object-based databases
- Relational model
- Inheritance in SQL
- Authorizations in SQL
- Storage and file structure
- Transaction controls
- Creating, managing, and deleting SQL server objects
- The architecture of the SQL server engine, and more.
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Components of SQL
- Data Definition Language (DDL):
This element of SQL allows users to create or define a database, change its structure, and delete it when they no longer need it. Examples of commands used here include CREATE TABLE, ALTER TABLE, and DROP TABLE
- Data Manipulation Language (DML):
The DML holds the subset of SQL commands that are used most frequently. Usually, these commands are used to manipulate the contents of a database. DML allows users to retrieve data from a database, add data to the database, modify information stored in the database, and erase information from the database. Commands used here include SELECT, INSERT, UPDATE, and DELETE.
- Data Control Language (DCL):
DCL is used to manage how different users access the database. This element allows database administrators to add database permission for users, or remove existing permissions. The most common commands used here include GRANT and REVOKE. These two commands form the basis of a relational database security model.
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Advantages of SQL
SQL can run on PCs, mainframes, laptops, tablets, servers, and smartphones. It can also run on the Internet, intranet, and local systems. Additionally, SQL databases can be moved from one device to another without any problems.
- Easy to learn and understand:
Commands in SQL programming are written using simple English phrases. This makes it easier to learn and write SQL queries.
- Open source:
Free databases from MariaDB, Postgres, and MySQL, which means that the SQL database can be used at a low cost.
- Interactive language:
Programmers often use SQL to talk to a database and get answers to questions easily and fast.
- Complete package:
SQL can be used to create databases, update and retrieve information from the database, share data with multiple users, and manage the security of a database.
- Multiple data views:
With SQL, database administrators can give different database users different views of the content and structure of the database.
- Client/server support:
SQL can be used to connect clients (front-end computers) to servers (back-end databases), thus supporting the client-server architecture.
- Desirable skill:
Today, SQL is a highly desirable prowess. Many jobs including web development, business data analysis, and IT support require strong SQL skills.
Applications of SQL Today
- Data integration scripts:
Database developers and administrators use SQL to write data integration scripts. This is actually the main application of SQL.
- Analytical queries:
Data analysts use SQL on a regular basis to set and run analytical queries.
- Retrieve information:
This is another popular application of SQL. SQL is used to retrieve subsets of information in a database for various data processing activities.