TABLES AND SQL Controlling Tables Programmatically By: Amit Kumar Singh

Tables 2 Dimensional matrix Unique name

2 Dimensional matrix

Unique name

SQL S tructured Q uery L anguage ANSI standard computer language Allows you to access a database Execute queries, retrieve, insert, delete, update records Freedom from intricacy & details of database softwares. EASY TO LEARN

S tructured Q uery L anguage

ANSI standard computer language

Allows you to access a database

Execute queries, retrieve, insert, delete, update records

Freedom from intricacy & details of database softwares.

EASY TO LEARN

Creating Tables CREATE TABLE table_name ( column_name1 data_type , column_name2 data_type , ....... ) ; Example, CREATE TABLE Person ( LastName varchar(30), FirstName varchar, Address varchar, Age int(3) ) ; Create Table tbldemo ( Name text(30), Age integer, Gender text(1) ); Data type depends on the Database management software you are using

CREATE TABLE table_name

( column_name1 data_type , column_name2 data_type , ....... ) ;

Example,

CREATE TABLE Person (

LastName varchar(30), FirstName varchar, Address varchar, Age int(3) ) ;

Create Table tbldemo

( Name text(30),

Age integer,

Gender text(1)

);

Data type depends on the Database management software you are using

SQL ALTER TABLE ALTER TABLE table_name ADD COLUMN _name datatype ALTER TABLE table_name DROP COLUMN column_name Example, ALTER TABLE tbldemo ADD COLUMN date_of_birth datetime ALTER TABLE tbldemo DROP COLUMN marks;

ALTER TABLE table_name ADD COLUMN _name datatype

ALTER TABLE table_name DROP COLUMN column_name

Example,

ALTER TABLE tbldemo ADD COLUMN date_of_birth datetime

ALTER TABLE tbldemo DROP COLUMN marks;

SQL INSERT INSERT INTO table_name VALUES (value1, value2,....) INSERT INTO table_name (column_name1,column_name2,...) VALUES (value1, value2,....) Example, INSERT INTO tbldemo VALUES ( 'Amit', 22, 'm', #8/22/1982#, 27474017 ) ; INSERT INTO tbldemo ( Name, Age, Gender, date_of_birth ) VALUES ('Preeti', 22, 'f', #2/18/1982#);

INSERT INTO table_name VALUES (value1, value2,....)

INSERT INTO table_name (column_name1,column_name2,...) VALUES (value1, value2,....)

Example,

INSERT INTO tbldemo VALUES ( 'Amit', 22, 'm', #8/22/1982#, 27474017 ) ;

INSERT INTO tbldemo ( Name, Age, Gender, date_of_birth )

VALUES ('Preeti', 22, 'f', #2/18/1982#);

SQL SELECT SELECT column_name(s) FROM table_name SELECT * FROM table_name SELECT * INTO new_table_name FROM original_table_name SELECT column_name(s) FROM table_name WHERE condition Example, SELECT Name FROM tbldemo WHERE GENDER='f';

SELECT column_name(s) FROM table_name

SELECT * FROM table_name

SELECT * INTO new_table_name FROM original_table_name

SELECT column_name(s) FROM table_name WHERE condition

Example,

SELECT Name FROM tbldemo WHERE GENDER='f';

SQL UPDATE UPDATE table_name SET column_name=new_value [, column_name=new_value] WHERE column_name=some_value ; Example, UPDATE tbldemo SET phone_no = 22523250 WHERE name='ShriRam';

UPDATE table_name SET column_name=new_value [, column_name=new_value] WHERE column_name=some_value ;

Example,

UPDATE tbldemo SET phone_no = 22523250 WHERE name='ShriRam';

SQL DELETE DELETE FROM table_name WHERE condition DELETE FROM table_name ( Note: Deletes the entire table!!) Example, DELETE FROM tbldemo WHERE Gender='f';

DELETE FROM table_name WHERE condition

DELETE FROM table_name ( Note: Deletes the entire table!!)

Example,

DELETE FROM tbldemo WHERE Gender='f';

SQL DROP TABLE DROP TABLE table_name Example, DROP TABLE tbldemo;

DROP TABLE table_name

Example,

DROP TABLE tbldemo;

More SQL… http://www.w3schools.com/sql/default.asp http://w3.one.net/~jhoffman/sqltut.htm

http://www.w3schools.com/sql/default.asp

http://w3.one.net/~jhoffman/sqltut.htm