Need SQL Assignment Help?
SQL (Structured Query Language) is used to manage data in relational databases. It is not a programming language and has no control flow statements or ability to perform computations. SQL is the standard for accessing data stored in the current big data platforms like Hadoop, NoSQL, and Apache Cassandra. A programmer needs to know how to write SQL queries to access, manipulate and update data from the database.
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What is SQL?
Structured Query Language (SQL) is a special-purpose programming language designed for managing data in relational database management systems (RDBMS). SQL is one of the most popular computer languages ever. It's used to create and manage databases central to most enterprise software systems.
Many web and mobile apps use SQL behind the scenes to store everything from your shopping cart to your search history. Because SQL is so widely used, there are many different dialects of the language—most notably Oracle SQL, MySQL SQL, and Microsoft SQL Server. Taken together these facts mean that you're almost certainly already working with SQL, even if you don't know it.
Types of SQL
Following are some of the types of SQL widely adopted by every enterprise around the globe:
- Data Definition Language (DDL)
- Data Manipulation Language (DML)
- Data Control Language (DCL)
- Data Query Language (DQL)
- Transaction Control Language (TCL)
Key Concepts of SQL
Let us emphasize understanding a few key topics that can be difficult for some students while working with SQL:
- Keys in SQL: The key is a single or combination of multiple fields in a table. A key enables you to select data from a database table using only a few characteristics, such as the database table name and the field name. Keys are also used to establish relationships among tables. Keys promote consistency by ensuring that related data appears in the same table.
- Views in SQL: Views are virtual tables that display the data stored in other tables. A view can display all or a few rows from a single table or many tables. Essentially, a view is an SQL query stored permanently in the database.
- SQL joins: In SQL, a JOIN operation combines records from two or more tables in a database. A JOIN links data from two tables by using values common to each. This operation may help retrieve data from two or more tables.
- Normalization: Normalization is a database design technique that reduces redundancy and dependency of data by dividing larger tables into smaller tables and linking them using relationships.
- Transaction in SQL: A transaction is a unit of work in which one or more changes are made to a database. A transaction propagates changes to the database in a logical order, whether manually by a user or automatically by some sort of program.
Advantages of SQL
SQL is a widely used, efficient programming language for communicating with databases. Some of the common advantages of SQL include the following:
- No coding skills: For data retrieval, there is no need for many lines of code. You need only essential SQL keywords--SELECT, INSERT INTO, UPDATE--as well as specific syntactic rules, which eventually make SQL a user-friendly language.
- Faster query processing: Using SQL query language, large amounts of data are retrieved quickly and efficiently, and therefore, you can perform operations such as insertion, deletion, and manipulation of data in a matter of seconds.
- Portable: SQL is a platform-independent query language and, therefore, can be used in PCs, servers, laptops, etc., consisting of any operating system.
- Standard language: SQL is a standardized structured query language supported by the International Organization for Standardization (ISO) and the American National Standards Institute (ANSI) used for relational databases. SQL’s lengthy, detailed, established documentation over the years has helped to set it as a solid programming language.
- Open source: Free, open-source databases developed by MySQL, MariaDB, and PostgreSQL means that you can use SQL databases at low cost and with help from a large community.
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