Introduction to SQL

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Questions and Answers

SQL stands for Standard Query Language.

False

SQL is a database sublanguage used in querying, updating, and managing relational databases.

True

SQL is derived from an IBM research group that created Structured English Query Language (SEQUEL) in the 1980s.

False

Data Manipulation Language (DML) is a module of the SQL language which enables you to create and modify the database itself.

False Signup and view all the answers

The DROP DATABASE statement is used to create a database.

False Signup and view all the answers

The ALTER TABLE statement is used to delete a specified table in a database.

False Signup and view all the answers

The SELECT clause is used to list the relations to be scanned in evaluation of an expression.

False Signup and view all the answers

The WHERE clause consists of a predicate involving attributes of relations that appear in the FROM clause.

True Signup and view all the answers

SQL is designed for technical users only.

False Signup and view all the answers

Data Definition Language (DDL) is used to retrieve data from a database.

False Signup and view all the answers

Data Control Language (DCL) is used to update data in a database.

False Signup and view all the answers

The CREATE TABLE statement is used to delete a specified table in a database.

False Signup and view all the answers

The FROM clause is used to list the attributes desired in the result of a query.

False Signup and view all the answers

SQL is used in querying, updating, and managing relational databases.

True Signup and view all the answers

The DROP DATABASE statement is used to create a database.

False Signup and view all the answers

Structured English Query Language (SEQUEL) was created in the 1990s.

False Signup and view all the answers

SQL can be used in formulating interactive queries or be embedded in an application as instructions for handling data.

True Signup and view all the answers

ALTER TABLE statement allows for the creation of a new database.

False Signup and view all the answers

Study Notes

Introduction to SQL

SQL stands for Structured Query Language, a database sublanguage used in querying, updating, and managing relational databases.
SQL was derived from IBM's research group that created Structured English Query Language (SEQUEL) in the 1970s.
SQL can be used for both interactive queries and embedded in applications as instructions for handling data.
SQL is designed for both technical and non-technical users.

Major Components of SQL

Data Manipulation Language (DML) allows you to retrieve, update, add, or delete data in a database.
Data Definition Language (DDL) enables you to create and modify the database itself.
Data Control Language (DCL) maintains the proper security for the database.

Database Manipulation

The CREATE DATABASE statement creates a database.
The DROP DATABASE statement deletes a database.

Database Table Manipulation

The CREATE TABLE statement creates a table within a database.
The ALTER TABLE statement allows for the modification of specific attributes of a table, such as adding and deleting columns.
The DROP TABLE statement deletes a specified table in a database.

Basic Data Retrieval

The SELECT clause lists the attributes desired in the result of a query, allowing retrieval of data in SQL.
The FROM clause lists the relations to be scanned in the evaluation of an expression.
The WHERE clause consists of a predicate involving attributes of relations that appear in the FROM clause.

Introduction to SQL

SQL stands for Structured Query Language, a database sublanguage used in querying, updating, and managing relational databases.
SQL was derived from IBM's research group that created Structured English Query Language (SEQUEL) in the 1970s.
SQL can be used for both interactive queries and embedded in applications as instructions for handling data.
SQL is designed for both technical and non-technical users.

Major Components of SQL

Data Manipulation Language (DML) allows you to retrieve, update, add, or delete data in a database.
Data Definition Language (DDL) enables you to create and modify the database itself.
Data Control Language (DCL) maintains the proper security for the database.

Database Manipulation

The CREATE DATABASE statement creates a database.
The DROP DATABASE statement deletes a database.

Database Table Manipulation

The CREATE TABLE statement creates a table within a database.
The ALTER TABLE statement allows for the modification of specific attributes of a table, such as adding and deleting columns.
The DROP TABLE statement deletes a specified table in a database.

Basic Data Retrieval

The SELECT clause lists the attributes desired in the result of a query, allowing retrieval of data in SQL.
The FROM clause lists the relations to be scanned in the evaluation of an expression.
The WHERE clause consists of a predicate involving attributes of relations that appear in the FROM clause.

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Description

Learn the basics of SQL, a database sublanguage used for querying, updating, and managing relational databases. Discover its history, uses, and design.