Mattingly "AI & Prompt Design: The Basics of Prompt Design"
RDBM S: Relational Database Management System
1. R DBM S elation ata ase anagement ystem
Name:
Class:
Section:
Roll No:
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BASICS OF RDBMS (SQL)
* What is DBMS?
Ans: DBMS stands for Data Base Management System.
A Database Management System is system software that is used to Create, Maintain and provide
controlled access to the user databases. (OR)
A Database Management System is a process of maintaining the data in the database in a
systematic form.
* What is Data?
͞Data͟ is nothing but ͞Facts͟. (OR)
The actual data stored in the database is called DATA. For example, the student database may
contain data like Student Roll No, Student Name, Student Address, etc͙.
* What is Database?
Database is known as ͞collection of Data͟. (OR)
An organised collection of logically related data is called Database. The Database may contain the
information about a particular organization or Enterprise. An Organization may be a College, University, Bank,
etc͙
* Data v/s Information?
We define the information as data that it would be processed, so the user may easily identify the
data.
For example, consider the following list of facts.
Rahul 12465 60
Mohan 20518 40
Arun 30198 70
The above data remains useless. We have no idea what the entire data means.
For example, we will place some data in the context form. Now it is useful data for some users.
Sri Vaishnavi degree College, Rajampet
Name Reg No Percentage
Rahul 12465 60
Mohan 20578 40
Arun 30198 70
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* Metadata:
Metadata is nothing but data about data . (OR)
The data that describes the properties or characteristic features of other data is called Metadata.
For example, consider the Metadata for the about student data on listed below.
Data Item Name Type Size Description
Name Alphabetic 20 Student Name
Reg No Numeric 10 Student Reg No
Percentage Numeric 2 Marks Percentage
* RDBMS:
RDBMS stands for Relation Database Management System.
A database that represents data as a collection of tables in which all the data relationships
can be maintained by the actual values in the related tables.
The Relation Data model was 1st introduced in ͞1970͟ by ͞E.F.Codd.͟
* What is SQL?
SQL stands for Structure Query Language.
Basically a Structure Query Language is a non procedural language. i.e.; the user needs to
specify the problem and not the procedure to same it. SQL is a very simple language that can be
learned and maintained easily.
* Procedural Language:
Example:
Having a Railway Reservation from friend.
1. Catch the bus.
2. Go to the Railway Station.
3. Fill the Reservation form.
4. Take ticket.
5. Again catch the bus &
6. Come to home.
* Non procedural Language:
Example:
Get me a Railway Reservation.
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* What are the features of SQL?
1. Reduction in Language code.
2. Simplicity in writing code.
3. Skills of writing simple code.
4. Reduction of maintaining software.
* How to start or enter into SQL?
Ans: Go to start menu. Select All programs. In that, select Oracle ʹ OraHome81. Then select Application
Development. Then click on SQL plus option.
Start All programs Oracle - OraHome Application Development SQL Plus Enter
An ͞Oracle SQL Plus͟ window is open with a small ͞Logon͟ textbox. In that, enter ͞username͟ as ͞scott͟
and password as ͞tiger͟. Then click on ͞OK͟ button.
Now the SQL window is open.
* Different types of SQL Commands or Compo nents of SQL?
Ans: The SQL commands are categorized into different types. They are:
1. DDL Data Definition Language
2. DML Data Manipulation Language
3. DQL Data Query Language
4. DCL Data Control Language
5. TCS Transaction Control Statement
6. DAS Data Audit Statement
1. DDL commands :
DDL commands are used to create, Alter and Delete the Database objects like Table. The
commands are ͞CREATE͟, ͞ALTER͟ and ͞DROP͟.
A. CREATE:
This command is used to create a table.
Syntax:
CREATE table <table name> (<colname 1 > <Data type> <size>,
<colname 2 > <Data type> <size>,
. . .
. . .
. . .
<colname n > <Data type> <size>);
Example:
CREATE table student (RNo Number(10),
S.Name varchar2(20),
Sub 1 Number (3),
Sub 2 Number (3),
Sub 3 Number(3),
Sub 4 Number(3),
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Sub 5 Number(3),
Sub 6 Number (3));
B.ALTER:
This command contains the THREE commands. They are:
I. ADD
ALTER
II. MODIFY
III. DROP
ADD MODIFY DROP
I.ADD:
This command is used to add a column to the existing table.
Syntax:
ALTER table < table name> ADD <colname> < Data type> < size>);
Example:
ALTER table Student ADD (Total Number (4));
Message: Table ALTER
II.MODIFY:
This command is used to modify the data type or size of the column.
Syntax:
ALTER table < table name> MODIFY <colname> < Data type> < size>);
Example:
ALTER table Student MODIFY (SName varchar2 (30));
Message: Table ALTER
III.DROP:
This command is used to delete a column.
Syntax:
ALTER table < table name> DROP <colname>);
Example:
ALTER table Student MODIFY (SName);
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2. DML commands:
DML commands are used to insert, update and delete the data in the database. The commands
used are ͞INSERT͟, ͞UPDATE͟ and ͞DELETE͟.
A. INSERT:
This command is used to insert record into the table. This command has Three (3)
syntaxes.
Syntax 1:
INSERT into <table name > values (value 1, value 2 ͙ value n);
Example:
INSERT into Student values ( 1008,͛Nikethan͛, 60, 77, 86, 98, 99, 91);
Syntax 2:
INSERT into <table name> (colname 1, colname 2 ... colnamen) values (value1, value2...value n);
3. DQL commands:
SQL has only one Query statement. The command used is ͞SELECT͟.
SELECT:
This command is used to retrieve the required data fro m the database.
Syntax:
SELECT astric (*) from <table name>;
Example:
SELECT * from student;
1.Using SELECT command by using ORDER BY:
This command is used to display the data in ͚Descending order͛ & ͚Ascending order͛ in the user
specify column name. In this, we have two (2) Syntaxes.
Syntax:
To see data in
SELECT astric (*) from <table name> ORDER BY <colane> DESC;
Descending order
Example:
SELECT * from student ORDER BY Roll No DESC;
Syntax:
SELECT astric (*) from <table name> ORDER BY <colane>; To see data in
Example: Ascending order
SELECT * from student ORDER BY Roll No ;
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2. Using SELECT command by using GROUP BY:
This command is used to display the specified data in groupwise.
Syntax:
SELECT Colname1, Colname2 from <tale name> GROUP BY <Colname>;
Example:
SELECT Dept No, SUM(SAL) from EMP GROUP BY Dept no;
3. Using SELECT command by applying HAVING:
This command is used to specify the data by the user require condition.
Syntax:
SELECT colname1,colname2 from <table name> GROUP BY <colname> HAVING <condition>;
Example:
SELECT Dept No, SUM(SAL) from EMP GROUP BY Dept no HAVING SUM(SAL) > 15,000;
LIST OF SPECIAL SELECT COMMANDS
1. SELECT UPPER (S.Name) from Student;
This command is used to display the student name in upper case.
2. SELECT LOWER (S.Name) from Student;
This command is used to display the student name in lower case.
3. SELECT CONCAT (͚National͛, ͚Integrity͛)from dual;
This command is used to combine TWO words.
4. SELECT GREATEST (͛06-Jan -09͛,͛20 ʹ Mar ʹ 09 ) from dual;
This command is used to display the greatest date among TWO above dates.
5. SELECT LTRIM ( ͚Super Computer͛,͛ Super͛) from dual;
This command is used to trim the specified word LEFT side.
6. SELECT RTRIM ( ͚Super Computer͛,͛ Super͛) from dual;
This command is used to trim the specified word RIGHT side.
7. SELECT LPAD (RPAD(͚B.Com͛,10,͟#͛),15,͛&͛)from dual;
This command is used to display the LEFT padding symbols & RIGHT padding symbols specified by
the user.
8. SELECT LAST_DAY(05-Jan-09) from dual;
This command is used to LAST DAY in the specified date.
9. SELECT MONTHS_BETWEEN(͛09-Jan-10͛)from dual;
This command is used to display the no. of months between the specified date.
10. SELECT POWER(2,5)from dual;
This command is used to display the POWER of specified values.
11. SELECT LENGTH (͚NIKETHAN͛)from dual;
This command is used to display the LENGTH of the specified text.
12. SELECT ROUND(8.124)from dual;
This command is used to ROUND the specified text.
13. SELECT SYS_DATE from dual;
This command is used to display the present SYSTEM DATE.
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14. SELECT SYS_TIME from dual;
This command is used to display the present SYSTEM TIME.
15. SELECT SQRT (25) from dual;
This command is used to find out SQUARE ROOT of the specified number.
4. DCL commands:
DCL commands is used to manage the data that the manipulation performed by the DML
commands. The DCL commands are ͞COMMIT͟, ͞ROLLBACK͟ and ͞SAVEPOINT͟.
A. COMMIT: This command is used to ͞SAVE͟ the table.
Ex: COMMIT;
B. ROLL BACK: This command is used to ͞ROLLBACK͟ to the specified location.
Ex: ROLLBACK;
C. SAVEPOINT: This command is used to ͞SAVE͟ the table in the form of modules.
Ex: SAVEPOINT SP;
5. TCS commands:
TCS commands are used to control the user access to the database. The commands are ͞GRANT͟
and ͞REVOKE͟.
A. GRANT: This command is used ro grant the permission to the user.
Syntax: Grant dba to <username>;
Ex: Grant dba to Nikethan;
B. REVOKE: This command is used to call off (cancel) the permission to the user.
Syntax: REVOKE from <username>;
6. DAS commands:
DAS commands are used to perform auditing. The commands used are ͞START AUDIT͟ and ͞STOP
AUDIT͟.
Creation of New user:
1. Enter username as ͞system͟
2. Enter password as ͞manager͟
Now, the SQL window will open.
Type as follows:
SQL> CREATE user Nikethan (username) identified by 143 (password);
user created.
Accessing Permission: SQL> Grant dba to Nikethan;
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