SQL Homework Help


What is SQL? Explain it.

SQL means Structured Query Language which lets you retrieve and handle databases. It is mainly a language used by databases. This language permits to control the information using tables and represents a language to query these tables and other related objects such as views, functions, procedures, etc. You can insert, delete, and update data with the use of SQL.

It is designed and created for managing (handling) data in a relational database management system(RDBMS). Structured Query Language (SQL) is an exclusive language for fetching, updating, and deleting information from databases. 

SQL is a language for identifying the organization’s databases. Databases coordinated with SQL are called relational databases because SQL offers the capability to query a database for information that exists in a given relation.

SQL skills assist data specialists to manage, create and fetch information from relational databases, which divide data into columns and rows. We require a query that will give back all call data, it returns each call data, in seconds. We can retrieve, update, modify, insert and manipulate data efficiently with the help of SQL.


Uses of SQL :

SQL can do or perform the following tasks :

  • SQL can perform queries against a database.
  • SQL can add records to a database.
  • SQL can delete data from a database.
  • SQL can make new databases.
  • SQL can fetch data from a database.
  • SQL can modify data in a database.
  • SQL can create new tables in a database.

SQL is utilized to interface with a database. On the report of the American National Standards Institute (ANSI ), it is the common language for relational database management systems. 


Types of SQL :

SQL Statements are :

  • Data Definition Language (DDL) Statements.
  • Data Manipulation Language (DML) Statements.
  • System Control Statement.
  • Embedded SQL Statements.
  • Transaction Control Statements.
  • Session Control Statements.


Basic SQL commands :

Some important SQL commands are as follows:

  • CREATE TABLE - It is used to create a new table.
  • INSERT INTO - It is used to insert or add new data into a database.
  • SELECT - It is used to extract or fetch data from a database.
  • UPDATE - It is used to update records in a database.
  • DELETE - It is used to delete records from a database.
  • CREATE DATABASE - It is used to make a new database.
  • ALTER DATABASE - It is used to modify or update a database.


Difference between SQL and MySQL :


MySQL is referred to as a database management system.
A database is an organized collection of data. You require a database management system such as MySQL Server to insert, access, and process data stored in a computer database.

SQL is an RDBMS means relational database management system relays on Structured Query Language (SQL ). MySQL can be used to save something from a single record of information to a whole catalog listing of accessible commodities or goods (products) for an online store.

Creating and maintaining a large web database in an efficient way is the most common use of MySQL. 

MySQL is a free and open-source relational database management system (RDBMS). Stand-alone clients are permitted MySQL, which offers users to collaborate (communicate) precisely with a MySQL database using SQL, but MySQL is used with other programs to apply and execute applications that require relational database efficiency more frequently.

The differences are:

MySQL is an open-source database product, and SQL is such a language that is used to query databases. SQL is used for fetching, inserting, maintaining and modifying data in a database and MySQL is an RDBMS that permits users to keep the data organized that stored in a database


Features of Structured Query Language (SQL) :

Some dominant features of SQL are listed as follows :

  • It offers Data Manipulation Language (DML): DML consists of commands used to manipulate the data. 
  • It provides client-server execution and remote database access
  • It's a simple and easy programming language
  • SQL is very powerful. 
  • It offers security and authentication
  • It gives advanced SQL and embedded SQL
  • It is a Transaction Control Language(TCL)


Advantages of SQL :

Some main advantages of SQL are listed as follows :

  • High speed: It offers faster query processing. Big amount of data is accessed rapidly and efficiently. 
  • No coding skills needed – A large number of lines of code is not needed for data retrieval. 
  • Standardized Language - It offers well-defined standards 
  • Highly portable 
  • Efficient and interactive language 
  • Multiple data views


Disadvantages of SQL :

Some disadvantages of SQL are listed as follows :

  • Lack of interface or it has poor interface. 
  • Provides no indexes.
  • It has security issues
  • Expensive: It is cost-inefficient. SQL Server Standard costs very high it’s around $1,418 per year.
  • Limited Control or lack of control - SQL doesn't give full control over databases to its users. 
  • Cursors and temporary tables represent a bad presentation.
  • Stored procedures are extremely hard to organize
  • Triggers and procedures are used without SET NOCOUNT ON.

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