SQL Basics Quiz
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Questions and Answers

What does SQL stand for?

Structured Query Language

SQL can only retrieve data from a database.

False

Which of the following is a characteristic of RDBMS?

  • Tables are not organized
  • Data is not related
  • Data is stored in tables (correct)
  • Uses SQL for queries (correct)

    • What is DDL in SQL?

    <p>Data Definition Language</p> Signup and view all the answers

    What does DML stand for?

    <p>Data Manipulation Language</p> Signup and view all the answers

    Which statement is an example of a DDL command?

    <p>CREATE TABLE</p> Signup and view all the answers

    Match the SQL statements with their descriptions:

    <p>CREATE TABLE = Creates a new table in the database ALTER TABLE = Modifies an existing table DROP TABLE = Deletes an existing table CREATE INDEX = Improves query performance on a column</p> Signup and view all the answers

    What does SQL stand for?

    <p>Structured Query Language</p> Signup and view all the answers

    SQL became a standard of the American National Standards Institute (ANSI) in 1986.

    <p>True</p> Signup and view all the answers

    Which of the following can SQL not do?

    <p>Delete non-existent tables</p> Signup and view all the answers

    What does RDBMS stand for?

    <p>Relational Database Management System</p> Signup and view all the answers

    What is a record in a database table?

    <p>A row</p> Signup and view all the answers

    What does DDL stand for in SQL?

    <p>Data Definition Language</p> Signup and view all the answers

    Which of the following is not an example of a DDL statement?

    <p>INSERT INTO</p> Signup and view all the answers

    What does DML stand for in SQL?

    <p>Data Manipulation Language</p> Signup and view all the answers

    DML statements are typically executed before DDL statements.

    <p>False</p> Signup and view all the answers

    Match the following SQL statements with their functions:

    <p>CREATE TABLE = Creates a new table in the database ALTER TABLE = Modifies an existing table DROP TABLE = Deletes an existing table INSERT INTO = Inserts new rows into a table</p> Signup and view all the answers

    Study Notes

    Introduction to SQL

    • SQL (Structured Query Language) allows access and manipulation of databases.
    • Became an ANSI standard in 1986 and an ISO standard in 1987.
    • Capabilities include querying, retrieving, inserting, updating, deleting, creating databases and tables, creating stored procedures and views, and setting permissions.

    RDBMS and Database Structure

    • RDBMS (Relational Database Management System) is the foundation for SQL and modern database systems (e.g., MS SQL Server, Oracle, MySQL).
    • Data is stored in tables, which consist of columns (fields) and rows (records).
    • A field holds specific information for each record in a table.
    • A record (or tuple) is a single entry in a table; a column is a vertical entity containing information for a specific field.
    • An attribute refers to a column or field within a database table.

    DDL (Data Definition Language)

    • Used to define database structure.
    • Includes creating, modifying, and deleting tables, columns, indexes, etc.
    • Example statements: CREATE TABLE, ALTER TABLE, DROP TABLE, CREATE INDEX, DROP INDEX.
    • Typically executed before data insertion to ensure proper database structure.

    DML (Data Manipulation Language)

    • Used to manipulate data within a database.
    • Includes inserting, updating, and deleting data from tables.
    • Example statements: INSERT INTO, UPDATE, DELETE FROM.
    • Typically executed after database structure is defined using DDL.

    DDL vs. DML

    • DDL defines the database structure (tables, columns, etc.).
    • DML manipulates the data within the defined structure.

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    Description

    Test your knowledge of SQL and RDBMS concepts with this quiz. Questions cover fundamental topics like DDL, DML, and identifying SQL statements. Perfect for students and professionals looking to brush up on their SQL skills.

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