Data Definition Language Quiz
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Questions and Answers

What is the correct syntax to insert data into a table?

  • INSERT INTO table_name(col1,col2) VALUES (value1,value2); (correct)
  • INSERT table_name(col1,col2) VALUES (value1,value2);
  • INSERT table_name VALUES (value1,value2);
  • INSERT INTO table_name SET col1=value1, col2=value2;

What is the primary purpose of the UPDATE command?

  • To modify existing records in a table. (correct)
  • To create a new table.
  • To add new records to a table.
  • To remove records from a table.

Which clause is necessary to specify which records to delete?

  • WHERE (correct)
  • SET
  • VALUES
  • FROM

What does the 'SET' keyword do in the UPDATE command?

<p>Identifies the new values for the columns. (D)</p> Signup and view all the answers

In the DELETE command, what does the clause 'FROM table_name' indicate?

<p>The table from which to delete records. (D)</p> Signup and view all the answers

What is the primary purpose of Data Definition Language (DDL)?

<p>To define the structure of database tables (D)</p> Signup and view all the answers

Which of the following is NOT a data type commonly used in DDL?

<p>Integer (C)</p> Signup and view all the answers

What command is used to create a new table in a database?

<p>CREATE (B)</p> Signup and view all the answers

Which DDL command would you use to add a new column to an existing table?

<p>ALTER (A)</p> Signup and view all the answers

When specifying a new table in DDL, which piece of information is NOT required?

<p>Index of each column (B)</p> Signup and view all the answers

Which command is used to remove an entire table from a database?

<p>DROP (C)</p> Signup and view all the answers

What does DML stand for in database management?

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

Which command is used to insert a data row into a table?

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

Flashcards

DDL

Data Definition Language, used to define database tables and their structures.

Data Types

Specify the kind of data a column can hold (e.g., text, numbers).

VARCHAR2

Data type for variable-length strings of text.

CHAR

Data type for fixed-length strings of text.

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NUMBER

Data type for numbers.

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CREATE TABLE

Command to create a new database table.

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ALTER TABLE

Command to modify table structure.

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DROP TABLE

Used to delete a table entirely.

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DML

Data Manipulation Language, for working with database records (inserting, updating, deleting).

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INSERT INTO

Adding new rows to a table.

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INSERT INTO Syntax

Used to add new rows (records) to a table in a database. Uses designated columns or all columns if values are provided for all columns in the table. Syntax is INSERT INTO table_name (col1, col2, ...) VALUES (val1, val2, ...)

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INSERT INTO Example

Inserting data into the 'it.student' table, including student name, branch, college, age, telephone, address, and birthdate.

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UPDATE Command

Used to change existing data in a table. Updates single or multiple columns based on given condition.

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UPDATE Example

Updating the 'stdname' and 'address' columns in the 'it.student' table where the 'stdname' is 'ALI'.

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DELETE Command

Deletes rows from a table based on a given condition. Removes data based on a given condition.

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DELETE Example

Deleting the row from it.student where the 'stdname' is 'monu'.

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Study Notes

Data Definition Language (DDL)

  • DDL is a language.
  • It allows the user to define data.
  • It defines the relationship between data and other data types.
  • DDL statements manage database table structure.
  • Various data types are used to define columns in a database table.
  • Examples of data types include VARCHAR2, CHAR, and NUMBER.
  • Defining a table involves specifying the table name, column names, data types, and column sizes.

DDL Commands

  • CREATE: Creates a new table or database.
    • Example command: CREATE TABLE it.student (...)
    • Example table structure includes fields for stdname, branch, college, age, telephone, and address.
  • ALTER: Modifies existing table structure.
    • Example command: ALTER TABLE it.student ADD birthdate DATETIME;
  • DROP: Deletes a table, index, or view from the database.
    • Example command: DROP TABLE it.student;

Data Manipulation Language (DML)

  • DML is used to manipulate data in a database.
  • Includes inserting, deleting, and updating data.

Insert Command

  • Inserts data rows into a table.
  • Syntax: INSERT INTO table_name (col1, col2, ...) VALUES (value1, value2, ...);
  • Alternative syntax: INSERT INTO table_name VALUES (value1, value2, ...);

Update Command

  • Updates existing data in a table.
  • Syntax: UPDATE table_name SET column1 = value1, column2 = value2 ... WHERE condition;
    • table_name: The table to update.
    • SET: Defines the columns and their new values.
    • WHERE: Specifies the condition for which rows should be updated.

Delete Command

  • Deletes records from a table.
  • Syntax: DELETE FROM table_name WHERE condition;
    • table_name: The table to delete from.
    • WHERE: Specifies the condition for deleting rows.

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Database Design and Administration 2nd Lecture PDF

Description

Test your knowledge on Data Definition Language (DDL) and its commands. This quiz covers various aspects of DDL, including table creation, modification, and deletion, along with associated data types. Perfect for those looking to strengthen their understanding of database structure management.

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