Download to read offline
![SELECT
To retrieve records from the table(s)
Syntax
Fetch all the columns
Fetch selected columns
Fetch records matching certain conditions
SELECT * FROM <TABLE_NAME>;
SELECT COLUMN1, COLUMN6 FROM <TABLE_NAME>;
SELECT * FROM <TABLE_NAME>
WHERE [CONDITION] ;](https://image.slidesharecdn.com/sql-150924211844-lva1-app6891/85/Sql-10-320.jpg)
![JOIN
To fetch data from two or more tables
There should be a common field between the tables
Syntax
SELECT TABLE1.COLUMN1, TABLE2.COLUMN1
FROM TABLE1 JOIN TABLE2
ON [CONDITION]](https://image.slidesharecdn.com/sql-150924211844-lva1-app6891/85/Sql-11-320.jpg)
Uploaded byKarthick Ramaswamy
Sql
This document provides an overview of relational database management systems (RDBMS) and SQL. It discusses that in RDBMS, data is stored in tables with records as rows and fields as columns. It then explains that SQL is used to communicate with databases in a non-procedural way using commands like SELECT, INSERT, UPDATE and DELETE. Finally, it gives examples of installing and using MySQL, an open source SQL implementation, along with common SQL commands like CREATE, INSERT, SELECT, and JOIN.
More Related Content
Sql
- 1.
- 3. RDBMS Relational DataBaseManagement System Data is stored in tables Database (DB) collection of tables Record each row in a table Field each column in a table
- 4. SQL Structured QueryLanguage SQL or sequel To communicate with the Databases Non-procedural language “what” rather than “how”
- 5. SQL Implementations Oracle DB2 Microsoft Access Microsoft SQL (MS-SQL) Sybase MySQL and many more …
- 6. MySQL Open source Available for both Windows and Linux Windows https://dev.mysql.com/downloads/file.php?id=458483 Linux yum install mysql-server.x86_64 chkconfig mysqld on service mysqld start Installation root mysql or mysql –u <user_name> -p Launch MySQL lteadm/ root
- 7. SQL Commands DDL Data Definition Language CREATE ALTER DROP DML Data Manipulation Language SELECT INSERT UPDATE DELETE DCL Data Control Language GRANT REVOKE
- 8. CREATE To createa database, table, view or other DB objects Syntax To create a DB To create a table CREATE DATABASE <DATABASE_NAME ; CREATE TABLE <TABLE_NAME> ( COLUMN1 datatype, COLUMN2 datatype, ……. COLUMNn datatype);
- 9. INSERT To inserta record into a table Syntax INSERT INTO <TABLE_NAME> (COLUMN1, COLUMN2,… COLUMNn) VALUES (VALUE1, VALUE2, … VALUEn);
- 10. SELECT To retrieverecords from the table(s) Syntax Fetch all the columns Fetch selected columns Fetch records matching certain conditions SELECT * FROM <TABLE_NAME>; SELECT COLUMN1, COLUMN6 FROM <TABLE_NAME>; SELECT * FROM <TABLE_NAME> WHERE [CONDITION] ;
- 11. JOIN To fetchdata from two or more tables There should be a common field between the tables Syntax SELECT TABLE1.COLUMN1, TABLE2.COLUMN1 FROM TABLE1 JOIN TABLE2 ON [CONDITION]