1. Database Management System LICT 3011 Eyad H. Elshami

2. Relational DBMS objects RDBMS has many objects: – Table – View – Synonym – Sequence – Index – Procedure/Function

3. SQL Structured Query Language (SQL) – Data Definition Language (DDL) Create Alter Drop – Data Manipulation Language (DML) insert update Delete – Select

4. Create Table Create table TABLENAME( Col 1 Name datatypeconstraintdefault, Col 2 Name datatypeconstraintdefault, Col 3 Name datatypeconstraintdefault,. Col x Name datatypeconstraintdefault );

5. Data types Data TypeUse to store number(n) an integer number within size n digits number(p, s) a real number within size p digits s of them after the floating point. char(n) a fixed length character varchar2(n) a variable length character date date and time raw binary data file with size 2000B Long raw binary file with size 2G BLOB binary file with size 4G

6. Constraints Not null – Attribute could not be empty Unique – Attribute value could not be duplicated Check – Attribute value must satisfies some condition Primary key – Attribute value satisfies not null, unique, and indexing Foreign key (reference) – Attribute value must be in the reference table

7. Create table example Create Table College( CID number(2) primary key, Cname varchar2(25) unique not null );

8. Create table example Create table students( SIDnumber(5) primary key, Sname varchar2(25) not null, Sgender char(1) default ‘m’ check(Sgender in(‘m’,’f’)), Sbdate date, CID number(2) references College(CID), Saveragenumber(5,2) );

9. Alter Table Alter Table TableName – Add ColumnName datatype default Constraint; – Add Constraint ConstraintName ConstrainType; – Modify ColumnName newdatatype; – Drop column ColumnName; – Drop Constraint ConstraintName;

10. Alter Examples Alter table students add Sphoto long raw; __________________________________ Alter table students modify sname varchar2(20); _________________________________ Alter table students drop column sphoto;

11. Alter Examples Alter table students add constraint sname_u unique(sname); __________________________________ Alter table students drop constraint sname_u; _________________________________

12. http://itc-shami.iugaza.edu:5560/isqlplus/

13. Create User, change you password create user UserName identified by Password default tablespace users temporary tablespace temp; alter user UserName identified by Newpassword;

14. Grant privileges to user Grant srole, unlimited tablespace to USERNAME;

15. Change you password alter user UserName identified by Newpassword;

16. Describe a table describe tablename To see the tables name – Select * from tab;