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Questions and Answers
What is the primary function of Data Manipulation Language (DML) in SQL?
What is the primary function of Data Manipulation Language (DML) in SQL?
DML is used to manipulate data present in the database by performing operations such as inserting, updating, and deleting data.
How do Data Control Language (DCL) commands function in relation to database security?
How do Data Control Language (DCL) commands function in relation to database security?
DCL commands, such as GRANT and REVOKE, are used to control access to data by managing user permissions and rights.
Explain the significance of Transaction Control Language (TCL) in SQL.
Explain the significance of Transaction Control Language (TCL) in SQL.
TCL is significant because it groups a set of tasks into a single execution unit, ensuring either all tasks are successfully completed or none are applied.
What differentiates DML from DDL in SQL commands?
What differentiates DML from DDL in SQL commands?
List the four categories of SQL commands and provide a brief function of each.
List the four categories of SQL commands and provide a brief function of each.
What is the purpose of Data Definition Language (DDL) in SQL?
What is the purpose of Data Definition Language (DDL) in SQL?
Explain the function of Data Query Language (DQL) in SQL.
Explain the function of Data Query Language (DQL) in SQL.
What types of operations can SQL commands perform on a database?
What types of operations can SQL commands perform on a database?
List three common SQL commands associated with Data Definition Language (DDL).
List three common SQL commands associated with Data Definition Language (DDL).
What role does Transaction Control Language (TCL) play in database management?
What role does Transaction Control Language (TCL) play in database management?
Describe the significance of Data Manipulation Language (DML) in SQL.
Describe the significance of Data Manipulation Language (DML) in SQL.
What does Data Control Language (DCL) do in the context of SQL?
What does Data Control Language (DCL) do in the context of SQL?
How does SQL interact with databases to manage data?
How does SQL interact with databases to manage data?
Flashcards
DML (Data Manipulation Language)
DML (Data Manipulation Language)
SQL commands that manipulate data in a database.
DCL (Data Control Language)
DCL (Data Control Language)
SQL commands for managing database access permissions.
TCL (Transaction Control Language)
TCL (Transaction Control Language)
SQL commands for managing transactions (sets of tasks).
SQL Command Categories
SQL Command Categories
DDL (Data Definition Language), DML, DCL, DQL, and TCL.
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SQL Transaction
SQL Transaction
A set of tasks that either complete completely or fail completely.
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SQL Commands
SQL Commands
Instructions for interacting with a database to perform operations, create tables, add data, and more.
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DDL (Data Definition Language)
DDL (Data Definition Language)
SQL commands for defining, altering, or deleting database structures (tables, indexes).
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DQL (Data Query Language)
DQL (Data Query Language)
SQL commands to query data within a database. Used to retrieve data.
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SQL Sub-languages
SQL Sub-languages
Different groups of SQL commands with specific functions.
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Database Operations
Database Operations
Actions performed on a database, such as creating tables and adding data.
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CREATE command
CREATE command
A DDL command used to create database objects, such as tables.
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DROP command
DROP command
A DDL command used to remove database objects.
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INSERT command
INSERT command
A DML command used to add data into a table.
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SQL Commands Overview
- SQL is a database language used for database operations and creation.
- It utilizes commands like CREATE, DROP, INSERT, etc.
- SQL commands interact with the database, performing various tasks.
- SQL allows creating tables, adding data, dropping tables, modifying tables, and setting user permissions.
Categories of SQL Commands
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Data Definition Language (DDL): Defines, alters, and deletes database structures (tables, indexes, schemas).
- Deals with database schema descriptions.
- Used to create and modify database object structures.
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Data Manipulation Language (DML): Manipulates data within the database.
- Controls data access and database operations.
- Includes most SQL statements.
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Data Control Language (DCL): Controls database access permissions.
- Manages user rights, permissions, and controls.
- Uses commands like GRANT and REVOKE.
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Data Query Language (DQL): Retrieves data from the database.
- Performs queries on data within objects.
- Retrieves data for operations.
- Compiles results into a temporary table.
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Transaction Control Language (TCL): Manages transactions.
- Groups tasks into execution units.
- Transactions either succeed or fail as a whole.
Specific Commands (Examples)
- DDL: CREATE TABLE, ALTER TABLE, DROP TABLE, etc.
- DML: INSERT, UPDATE, DELETE, etc.
- DCL: GRANT, REVOKE
- DQL: SELECT
- **TCL:**COMMIT, ROLLBACK, SAVEPOINT, etc.
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