SQL Table Statements Quiz

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Questions and Answers

Which of the following is not a primary data structure according to the text?

Graph

Hierarchical

Class

Table (correct)

In which decade did the Initial product releases of the example database systems occur?

1970s

1990s

1960s (correct)

1980s

What does the relational data structure organize data into?

Sets (correct)

Trees

Graphs

Linked lists

Which data type is mentioned in the text as a part of the relational data structure?

Integer Signup and view all the answers

What is a tuple according to the text?

A named tuple of values Signup and view all the answers

Which database system is associated with 'Flexible schema' and 'Unstructured and semi-structured data'?

MongoDB Signup and view all the answers

What are the relational operations based on set theory used to generate result tables from input tables?

Select, Project, Product, Join Signup and view all the answers

Which SQL sublanguage is used for managing access to data in a relational database?

Data Control Language Signup and view all the answers

What ensures the uniqueness of column names in a relational database?

Unique column names Signup and view all the answers

What is the purpose of SQL constraints in a relational database?

To enforce business rules based on company policy Signup and view all the answers

What statement is used to create a new database in SQL?

CREATE DATABASE Signup and view all the answers

What are the components of a table in a relational database?

Name, sequence of columns, set of rows Signup and view all the answers

What is the purpose of the SELECT statement in SQL?

To select rows from a table Signup and view all the answers

What does the NOT NULL constraint do in SQL?

Prevents NULL values in a column Signup and view all the answers

What is a primary key in SQL?

A column or group of columns used to uniquely identify a row Signup and view all the answers

What does the TRUNCATE statement do in SQL?

Deletes all rows from a table Signup and view all the answers

What is the purpose of a composite primary key in SQL?

To uniquely identify each row using multiple columns Signup and view all the answers

What is the purpose of the WHERE clause in the SQL SELECT statement?

To specify conditions for selecting rows Signup and view all the answers

What is an auto-increment column in MySQL?

A column that automatically receives a new value when a new row is added Signup and view all the answers

What happens if a specific value is inserted into an auto-increment column in MySQL?

It overrides the auto-increment for a primary key Signup and view all the answers

What is a foreign key in MySQL?

A column or group of columns that refers to a primary key Signup and view all the answers

Under what circumstances can referential integrity violations occur in MySQL?

When a foreign key row is deleted Signup and view all the answers

What does the ON DELETE clause of the FOREIGN KEY constraint specify in MySQL?

The action taken when a primary key row is deleted Signup and view all the answers

What does the UNIQUE constraint ensure in MySQL?

It ensures unique values in a column or group of columns Signup and view all the answers

Which SQL statement is used to delete an existing table and all its data?

DROP TABLE Signup and view all the answers

Which data type is used for storing raw binary data in SQL?

BLOB Signup and view all the answers

Which SQL statement is used to add, delete, or modify columns in an existing table?

ALTER TABLE Signup and view all the answers

Which type of data is stored using the CHAR data type in SQL?

Fixed-length character strings Signup and view all the answers

Which operator is used in SQL for unary negation?

NOT Signup and view all the answers

Which SQL statement is used to select specific rows from tables based on various conditions?

SELECT Signup and view all the answers

Study Notes

The text discusses various SQL statements for managing tables and data in a database, including CREATE TABLE, DROP TABLE, and ALTER TABLE.
CREATE TABLE statement creates a new table with specified name, column names, and data types.
DROP TABLE statement deletes an existing table and all its data.
ALTER TABLE statement modifies an existing table by adding, deleting, or modifying columns.
Three common data types in relational databases: integer, decimal, and character.
Integer data types include INT, SMALLINT, and others, with varying storage sizes and signed or unsigned ranges.
Decimal data types include FLOAT and DECIMAL, with exact or approximate decimal values and different storage requirements.
Character data types include CHAR and VARCHAR, with fixed or variable lengths and different storage requirements.
Date and time data types include DATE, TIME, DATETIME, and TIMESTAMP, with different formats and ranges.
Binary data types include BLOB and BINARY, for storing raw binary data.
Spatial data types store geometric information, such as POINT, POLYGON, and GEOMETRY.
Document data types include XML and JSON, for storing structured textual data.
ALTER TABLE statement has three clauses for adding, modifying, or deleting columns, respectively.
SQL supports various arithmetic, comparison, and logical operators for manipulating data.
Operators can be unary or binary, and compute values from numeric, character, and other data types.
Examples of arithmetic operators include addition (+), subtraction (-), multiplication (*), division (/), modulo (%), and exponentiation (^).
Examples of comparison operators include equality (=), inequality (<>), greater than (>), less than (<), and range comparisons.
Examples of logical operators include NOT (unary negation), AND, OR, and IN.
SQL allows for selecting specific rows from tables based on various conditions with the SELECT statement.

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Description

Test your knowledge of SQL table statements with this quiz. Explore the concepts of creating, dropping, and altering tables, along with different data types for columns.