Data Definition After this lecture, you should be able to: Use SQL DDL Statement to define a database structure. Work with mysql or phpMyAdmin to access your MySQL databases. Complete Assignment 2 (Part II - a, b). 1

SQL DDL Statements Create Table create table s (sno char(5), ... ); Drop Table drop table s; Alter Table alter table s add phone char(13); Create View create view SV as select .... Drop View drop view SV; Create Index create index X on s(sno); Drop Index drop index X;

Suppliers-Parts Database: E-R Diagram sno (key) pno (key) sname pname SP M S M P city status city qty color weight

Supplier-Part Database Table S Table P sno | sname | status | city pno | pname | color | weight | city ------------------------------ ---------------------------------- s1 | Smith | 20 | London p1 | nut | red | 12 | London s2 | Jones | 10 | Paris p2 | bolt | green | 17 | Paris s3 | Blake | 30 | Paris p3 | screw | blue | 17 | Rome s4 | Clark | 20 | London p4 | screw | red | 14 | London s5 | Adams | 30 | Athens p5 | cam | blue | 12 | Paris p6 | cog | red | 19 | London Table SP sno | pno | qty --------------- s1 | p1 | 300 s1 | p2 | 200 s1 | p3 | 400 s1 | p4 | 200 s1 | p5 | 100 s1 | p6 | 100 s2 | p1 | 300 s2 | p2 | 400 s3 | p2 | 200 s4 | p2 | 200 s4 | p4 | 300 s4 | p5 | 400

Create Table Statements sno char(5) not null, sname char(20) not null, status smallint, city char(15), primary key (sno) ); create table p ( pno char(6) not null, pname char(20) not null, color char(6), weight smallint, primary key (pno) create table sp ( qty integer not null, primary key (sno, pno)

Data Types integer The magnitude range is -2,147,484,648 ... +2,147,484,647. real For fixed or floating-point numbers. Allowable values are -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to 3.402823466E+38. char For fixed length character strings up to 255 bytes. varchar For variable-length character strings. The maximum length is 65,532 bytes. bit[n] n indicates the number of bits, from 1 to 64. The default is 1 if n is omitted . date Year values in the range 70-99 are converted to 1970-1999. Year values in the range 00-69 are converted to 2000-2069. datetime Date and time. The format is ‘YYYY-MM-DD HH:MM:SS’.

Creating S-P-SP Database % mysql –h mysql.cs.orst.edu –u pham –p pham Enter password: mysql> \. create_s_p_sp.sql; Query OK, 0 rows affected (0.01 sec) SQL> show tables; TABLE_in_pham ----------------- p s sp

Looking at Table Structures mysql> desc s; Name Null? Type ---------- -------- ---- SNO NOT NULL CHAR(5) SNAME NOT NULL CHAR(20) STATUS SMALLINT(6) CITY CHAR(15) mysql> desc p; Name Null? Type PNO NOT NULL CHAR(6) PNAME NOT NULL CHAR(20) COLOR CHAR(6) WEIGHT SMALLINT(6)

Adding Data to a Table insert into s values('s1', 'Smith', 20, 'London'); values('s2', 'Jones', 10, 'Paris'); values('s3', 'Blake', 30, 'Paris'); values('s4', 'Clark', 20, 'London'); values('s5', 'Adams', 30, 'Athens'); mysql> \. insert_s_p_sp.sql Query OK, 0 rows affected (0.01 sec) . . .

Showing Table Contents SQL> select * from s; SNO SNAME STATUS CITY ---- ------- -------- ------ s1 Smith 20 London s2 Jones 10 Paris s3 Blake 30 Paris s4 Clark 20 London s5 Adams 30 Athens SQL> select * from p; PNO PNAME COLOR WEIGHT CITY ----- ------- ------- -------- ------- p1 nut red 12 London p2 bolt green 17 Paris p3 screw blue 17 Rome p4 screw red 14 London p5 cam blue 12 Paris p6 cog red 19 London

Sailors-Boats Database: E-R Diagram (Schema) sid (key) sname bid (key) bname Reserves Sailor M M Boat date rating age color 4

Create Table Statements create table sailors ( sid integer not null, sname char(20) not null, rating smallint, age real, primary key (sid) ); create table boats ( bid integer not null, bname char(20) not null, color char(10), primary key (bid) create table reserves ( sid integer not null, day date not null, primary key (sid, bid, day)

Sailors-Boats Database: Tables sid sname rating age 22 Dustin 7 45.0 33 Libber 8 55.5 Boats bid bname color 2 Yuppy Blue 3 Lubber Red Reserves sid bid day 22 2 10/10/96 3 10/09/96 33 11/12/96