Sql and Sql commands
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This document provides an overview of MySQL, a relational database management system that uses SQL. It discusses the different languages used in SQL - Data Definition Language (DDL) for creating and modifying database objects, Data Manipulation Language (DML) for inserting, updating, selecting and deleting data, Data Control Language (DCL) for granting and revoking user privileges, and Transaction Control Language (TCL) for managing transactions. Each section provides examples of key commands used for each language type and their purposes.
Sql and Sql commands
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- 3. WHAT IS MYSQL…..? MYSQL is a freely available open source Relational Database Management System that uses Structured Query Language(SQL). 1
- 4. KEY POINTS Information is stored in tables. Can store thousands of individual records. Support a secure environment for storing , maintaining and accessing data. Fast , reliable. 1
- 7. DDL – DATA DEFINITION LANGUAGE STATEMENTS USED TO CREATE , ALTER,DROP DATABASES PROJECTS. -> CREATE: USED TO DEFINE NEW OBJECTS. -> ALTER: USED TO MODIFY THE DEFINITION OF EXISTING OBJECTS. -> DROP: USED TO REMOVE EXISTING UNITS. -> TRUNCATE TABLE : USED TO REMOVE ALL ROWS FROM A TABLE WITHOUT LOGGING THE INDIVIDUAL ROW DELETIONS. 1
- 8. MYSQL Command line for create command: 1
- 9. DATA DEFINITION LANGUAGE (DDL) Commands that allow you to perform tasks related to data definition. Commands used are: • Create : used to create table. • Alter : used to add or remove something from table. • Drop : used to drop the database. 1
- 10. DATA MANIPULATION LANGUAGE (DML) Commands that allow you to manipulate the data stored in a database. Commands used are: • Insert : used to insert data in a table. • Select : used to select data from table. • Update : used to make changes in table. • Delete : used to delete data from table or the whole table. 1
- 11. MYSQL Command line for insert command: 1
- 12. DML – DATA MANIPULATION LANGUAGE. STATEMENTS USED TO RETRIVE , INSERT , UPDATE , REMOVE AND MANAGE DATA WITHIN DB OBJECTS. -> SELECT : RETRIVES ONE OR MORE ROWS FROM A TABLE VIEW - >INSERT : INSERT ONE OR MORE ROWS FROM A TABLE OR VIEW. ->UPDATE : CHANGES EXISTING DATA IN A TABLE OR VIEW. - >DELETE : REMOVES ONE OR MORE ROWS FROM A TABLE OR A VIEW. - >BULK INSERT : IMPORTS A DATA FILE INTO A DATABASES TABLE OR VIEW IN A USER SPECIFIED FORMAT. 1
- 13. DATA CONTROL LANGUAGE (DCL) Commands used to control the data by giving or taking back the privileges or access. Command used are: • Grant : used to grant permission to user for any task. • Revoke : used to take back the permission given to the user. 1
- 14. DCL – DATA CONTROL LANGUAGE STATEMENTS USED TO CONTROL THE ACCESS OF DATA STORED IN DATABASES AND PROVIDE DATA SECURITY. -> GRANT : GRANTS PERMISSIONS ON A SECURABLE TO A PRINCIPAL. -> REVOKE : REMOVES A PREVIOUSLY GRANTED OR DENIED PERMISSION. ->EXECUTE AS , STATEMENT : SETS THE EXECUTION CONTEXT OF A SESSION. -> EXECUTE AS, CLUASE : DEFINE THE EXECUTION CONTEXT OF THE FOLLOWING USER DEFINED MOLECULES : FUNCTION (EXCEPT INLINE TABLE – VALUED FUNCTIONS), PROCEDURES , QUEUES AND TRIGGERS. 1
- 15. TRANSACTION CONTROL LANGUAGE (TCL)Commands used for transaction control purpose. Commands used are: • Commit : ends the current transaction and by saving database changes and starts a new transaction. • Savepoint : defines breakpoints for transaction to allow partial rollback. • Rollback : ends the current transaction by discarding database changes and starts a new transaction. 1
- 16. TCL – TRANSACTION CONTROL LANGUAGE. STATEMENTS USED TO MANAGE THE CHANGES MADE BY DML STATEMENTS.IT ALLOWS STATEMENTS TO BE GROUPED TOGETHER INTO LOGICAL TRANSACTION. -> BEGIN TRANSACTION : MARKS THE STARTING POINT OF AN EXCLIPT , LOCAL TRANSACTION INCREAMENTS @@ TRANCOUNT BY 1. -> COMMIT TRANSACTION : MARKS THE END OF A SUCCESSFUL IMPLICT OR EXPLICT TRANSACTION. -> ROLLBACK TRANSACTION : ROLLS BACK AN EXPLICT OR IMPLICT TRANSACTION TO THE BEGINNING OF THE TRANSACTION, OR TO SAVE POINT INSIDE THE TRANSACTION. 1
- 17. THANK YOU! 1