The document is a presentation about Structured Query Language (SQL) given by Md. Soumik Ahmmed from the Computer Science & Engineering department at Pundra University of Science & Technology. It defines SQL as a language used to store, manipulate, and retrieve data from relational databases. It outlines the main types of SQL commands, including data definition language, data manipulation language, data control language, transaction control language, and data query language. It provides examples of commands that fall under each language type and discusses the advantages and disadvantages of SQL.

1. Pundra University of Science & Technology
Rangpur Road, Gokul, Bogura
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Welcome To My Presentation
Name: Md. Soumik Ahmmed
Department: Computer Science & Engineering
Course Code: CSE-313
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2. Presentation topic:
Structure Query Language (SQL)

3. WHAT IS SQL ?
 SQL (Structured Query Language) is a computer language
aimed to store, manipulate, and retrieve data stored in
relational databases.
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4. Types of SQL Command:
1. Data definition language (DDL).
2. Data Manipulation Language.
3. Data Control Language.
4. Transaction Control Language.
5. Data Query Language.
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5. Types of SQL Command:
 Data definition language (DDL): Data-definition language (DDL) provides
commands for defining relation schemas, deleting relations, and modifying
relation schemas.
Here are some commands that come under DDL:
 CREATE
 ALTER
 DROP
 TRUNCATE
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6. Types of SQL Command:
 Data Manipulation Language: Data Manipulation Language (DML) includes also
commands to insert tuples into, delete tuples from, and modify tuples in the
database.
Here are some commands that come under DML:
 INSERT
 UPDATE
 DELETE
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7. Types of SQL Command:
 Data Control Language: Data Control Language (DCL) commands are used to
grant and take back authority from any database user.
Here are some commands that come under DCL:
 Grant
 Revoke
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8. Types of SQL Command:
 Transaction Control Language: Transaction Control Language (TCL) commands
can only use with DML commands like INSERT, DELETE and UPDATE only.
 These operations are automatically committed in the database that's why
they cannot be used while creating tables or dropping them.
Here are some commands that come under TCL:
 COMMIT
 ROLLBACK
 SAVEPOINT
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9. Types of SQL Command:
 Data Query Language: Data Query Language (DQL) is used to fetch the data
from the database.
It uses only one command:
 SELECT
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10. Advantages of SQL
 High speed.
 No coding needed.
 Well defined standards.
 Portability.
 Interactive language.
 Multiple data view.
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11. Disadvantages of SQL
 Interfaces.
 Complex Interface.
 Implementation.
 Only Partial Control.
 Expense.
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12. Thank You
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