1. SQL Structured Query Language 1

2. Data Definition Language (DDL) is used to manage table and define data structure i.e. CREATE, ALTER, DROP Data Control Language (DCL) is used to control user’s privilege on accessing data i.e. GRANT, REVOKE Data Manipulation Language (DML) is used to manage data record i.e. ADD, UPDATE, and DELETE. – This may include SELECT but it may be consider as a member of Data Query Language (DQL) 2

3. Browsing Databases Some useful commands to begin with – show databases; – use ; – show tables; – desc ; – create database ; Create a new database CREATE DATABASE BangNa; 3

4. Create a Table CREATE TABLE std_phone ( STD_ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY, FNAME VARCHAR (64) NOT NULL, LNAME VARCHAR(64 ) NOT NULL, PHONE VARCHAR(12) NOT NULL ) CREATE TABLE ( column_name1 …..,............ column_name2 …..,............ ……………………….. ) 4

5. Create a User It is a good idea to create a username to manage tables in new created database Proper privileges can be granted to a particular user so that only a user who has right access can manage the table GRANT [(col1, col2, … colN)] ON database.[table] TO user@host IDENTIFIED BY 'passwd'; GRANT select ON webtech.student_profile TO tct IDENTIFIED BY ‘tct'; 5

6. SELECT Statements Select all records (rows) from a table Select some columns of all records from a table SELECT * FROM ; SELECT col 1, col 2,….col n FROM ; SELECT * FROM std_phone; SELECT std_id, fname, lname FROM std_phone; 6

7. SELECT Statements (cont.) Select some records from a table WHERE clause could be any boolean expression SELECT * FROM std_phone WHERE std_id < 20; SELECT * FROM WHERE ; SELECT * FROM std_phone WHERE std_id < 20 AND fname like ‘sor%’; 7

8. INSERT INTO Insert a record into a table Insert record(s) from a table right into another table INSERT INTO table (col1, col2, col3) VALUES(val1, val2, val3); INSERT INTO std_phone (fname, lname, phone) VALUES(“Khaosai”, “Galaxy”, “088-123-4567”); INSERT INTO std_phone (fname, lname, phone) select fname, lname, phone from std_profiles where academic_year = ‘2552’; 8

9. Edit a Record Modify a record Modify Khaosai’s phone number UPDATE SET field1=’val1’, field2=’val2’, field3=’val3’ WHERE ; UPDATE std_phone SET phone=‘089-123-1234’ WHERE fname = ‘Khaosai’ AND lname = ‘Galaxy’; 9

10. Delete Record(s) Delete selected record(s) Delete Khaosai’s record from the table – This will delete all records with firstname ‘Khaosai’ – This will delete all records with lastname ‘Galaxy’ DELETE FROM WHERE ; DELETE FROM std_phone WHERE fname = ‘Khaosai’; DELETE FROM std_phone WHERE lname = ‘Galaxy’; 10

11. Delete Record(s) Do a better job with AND – Anyway, this would be a better choice by using primary key to locate the target record to be deleted. Note: avoid this; – it will delete all records in the tatble DELETE FROM std_phone WHERE std_id = 20; DELETE FROM std_phone WHERE fname = ‘Khaosai’ AND lname = ‘Galaxy’; DELETE FROM std_phone; 11

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