Oracle SQL Data Types

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Questions and Answers

What is the primary purpose of the NUMBER data type in Oracle database?

To store numeric values.

What is the main difference between the BLOB and CLOB data types?

BLOB is used for binary data, while CLOB is used for character data.

Which data type is used to store very large amounts of unstructured data in Oracle database?

BFILE.

What is the purpose of the DATE data type in Oracle database?

<p>To store dates and times.</p> Signup and view all the answers

What is the main purpose of the VARCHAR2 data type in Oracle database?

<p>To store variable-length character strings.</p> Signup and view all the answers

What are the three character data types in Oracle database that support Unicode characters?

<p>NCHAR, NVARCHAR2</p> Signup and view all the answers

Which two data types are used to store large amounts of binary data in Oracle database?

<p>BLOB, BFILE</p> Signup and view all the answers

What is the main difference between the CHAR and VARCHAR2 data types in Oracle database?

<p>CHAR is a fixed-length character data type, while VARCHAR2 is a variable-length character data type</p> Signup and view all the answers

Which data type is used to store date and time values in Oracle database?

<p>DATE, TIMESTAMP</p> Signup and view all the answers

What is the purpose of the LONG and RAW data types in Oracle database?

<p>LONG is used to store large amounts of character data, while RAW is used to store binary data</p> Signup and view all the answers

Flashcards

NUMBER data type?

Used to store numeric values.

BLOB vs. CLOB?

BLOB stores binary data, CLOB stores character data.

BFILE data type?

BFILE is used to store very large amounts of unstructured data.

DATE data type?

Used to store dates and times.

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VARCHAR2 data type?

Used to store variable-length character strings.

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Oracle Unicode data types?

Character data types that support Unicode characters. Supports multiple languages.

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Large binary data types?

BLOB and BFILE are used to store large amounts of binary data.

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CHAR vs. VARCHAR2?

CHAR is fixed-length, VARCHAR2 is variable-length.

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Date and Time data types?

DATE and TIMESTAMP are used to store date and time values.

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LONG vs RAW?

LONG stores large character data, RAW stores binary data.

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Study Notes

Classification of Built-in Data SQLTypes in Oracle Database

  • Oracle database has five categories of built-in data types

Character Data Types

  • Include: CHAR, VARCHAR2, NCHAR, NVARCHAR2
  • Used to store character data

Number Data Types

  • Include: NUMBER, FLOAT
  • Used to store numerical data

Datetime and Interval Data Types

  • Include: DATE, TIMESTAMP
  • Used to store date and time data

Large Object (LOB) Data Types

  • Include: BLOB, CLOB, NCLOB, BFILE
  • Used to store large objects such as images, videos, and audio files

LONG and RAW Data Types

  • Include: LONG, RAW
  • Used to store long strings of raw, unformatted data

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