EXPERIMENT OF DBMS

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EXPER IMENT - 1

1. TITLE: Study of DDL commands.

2. OBJECTIVES:At the end of the course students will able:

1. Have a good understanding of how several fundamental algorithmswork, articularly those concerned with creation and u!dating of tables.

". Have a good understanding of the fundamental D#$S used in com!uterScience

%. be able to understand various &ueries and their e'ecution.(. be able to design new database and modify e'isting ones for new

A!!lications and reason about the efficiency of the result

3.1 AIM:

)o study the usage of various Data $ani!ulation Language commands

3.2 SUBJECT RELATED OUTCOMES

)o be able to understand the re&uirement and uses of database in the real life

and how to create database structure !ractically using basic database conce!ts.

1. )o be able to *+A) table in the database.

". )o be able to AL)+ or $-D/0 table.

%. )o be able to D+- table from the Database.

4 . INPUT:

4.1 REQUIREMENTS

+e&uires com!uters with at least one database tool -+A*L, $SSL, D#" etc.

4.2THEORY


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A data definition language or data descri!tion language 2DDL3 is synta' similar to a

com!uter !rogra m m i n g l a ngua g e for defining da ta s tru c ture s, es!ecially d a tabase

sc he m as.

o *+A) 4 to create ob5ects in the databaseo AL)+ 4 alters the structure of the database

o D+- 4 delete ob5ects from the database

o )+67*A) 4 remove all records from a table, including all s!acesallocated

for the records are removed

o *-$$7) 4 add comments to the data dictionaryo +7A$ 4 rename an ob5ect

5. PROCEDURE:

1. *+A) )A#L

". AL)+ )A#L

a. ADD

b. $-D/0

%. )+67*A) )A#L

(. D+- )A#L
http://en.wikipedia.org/wiki/Programming_languagehttp://en.wikipedia.org/wiki/Data_structurehttp://en.wikipedia.org/wiki/Database_schemahttp://en.wikipedia.org/wiki/Database_schemahttp://en.wikipedia.org/wiki/Database_schemahttp://en.wikipedia.org/wiki/Data_structurehttp://en.wikipedia.org/wiki/Database_schemahttp://en.wikipedia.org/wiki/Database_schemahttp://en.wikipedia.org/wiki/Database_schemahttp://en.wikipedia.org/wiki/Programming_language


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1. CREATE TABLE COMMAND

A *+A) statement in S L creates an ob5ect inside of a r e l a ti o na l

da ta basem anag e m en t syste m 2+D#$S3.

SL8create table student 2rollno number2"3,name varchar"2"93,de!t

varchar"23,do5 date3;

Ex!"#!$ O%#%#:

SL8 desc student;

7ame 7ull< )y!e

44444444444444444444444444444444444444444 44444444

4444444444444444444444444444 +-LL7-

76$#+2"3

7A$ =A+*HA+"2"93

D) =A+*HA+"23

D-> DA)

2. ALTER TABLE COMMAND

An AL)+ statement in S L changes the !ro!erties of an ob5ect inside

of a r e l a ti o n a l da ta b a se m anage m en t syste m 2+D#$S3.

ADD *-$$A7D

SL8 alter table student add regno number2193;

)able altered. $.A.$. S*H--L -/ 7?

SL8 desc student;

7ame 7ull< )y!e

44444444444444444444444444444444444444444 44444444

4444444444444444444444444444 +-LL7-

76$#+2"3
http://en.wikipedia.org/wiki/SQLhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/SQLhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/SQLhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/Relational_database_management_systemhttp://en.wikipedia.org/wiki/SQLhttp://en.wikipedia.org/wiki/Relational_database_management_system


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7A$ =A+*HA+"2"93

D) =A+*HA+"23

D-> DA)

+?7- 76$#+2193

3. MODI&Y COMMAND

SL8 alter table student modify 2 name varchar"2"33;

)able altered.

SL8 desc student;

7ame 7ull< )y!e

44444444444444444444444444444444444444444 44444444

4444444444444444444444444444 +-LL7-

76$#+2"3

7A$ =A+*HA+"2"3

D) =A+*HA+"23

D-> DA)

+?7- 76$#+2193

4. TRUNCATE TABLE COMMAND

n S L, the )+67*A) )A#L statement is a Da ta D e fi n i ti o n Lang u ag e 2DDL3

o!eration that marks the e'tents of a table for deallocation 2em!ty for reuse3. )he

result of this o!eration &uickly removes all data from a tab l e, ty!ically by!assing

a number of integrity enforcing mechanisms.

7S+)7? DA)A 7)- )A#L:

SL8 insert into student values21,@a5ay@,@cse@,@14aug49@,B9B"19(9913;

1 row created

SL8 insert into student values21,@barathi@,Cece@,@"945uly49@,B9B%19(9913;
http://en.wikipedia.org/wiki/SQLhttp://en.wikipedia.org/wiki/Data_Definition_Languagehttp://en.wikipedia.org/wiki/Data_Definition_Languagehttp://en.wikipedia.org/wiki/Table_(database)http://en.wikipedia.org/wiki/SQLhttp://en.wikipedia.org/wiki/Data_Definition_Languagehttp://en.wikipedia.org/wiki/Table_(database)


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1 row created

SL8 select from student;

+-LL7- 7A$ D) D-> +?7-

4444444444 4444444444444444444444444 44444 444444444 4444444444444444444444444444444444

1 a5ay cse 14A6?49 B9B"19(991

1 barathi ece "94>6L49 B9B%19(991

SL8 truncate table student;

)able truncated.


no rows selected

SL8 desc student;

7ame 7ull< )y!e

44444444444444444444444444444444444444444 44444444

4444444444444444444444444444 +-LL7-

76$#+2"3

7A$ =A+*HA+"2"3

D) =A+*HA+"23

D-> DA)

+?7- 76$#+2193

5. DROP TABLE COMMAND

)o destroy an e'isting database, table, inde', or

view. SL8 dro! table student;

)able dro!!ed.

SL8 desc student;


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++-+:

-+A49(9(%: ob5ect student does not e'ist


select from student

++-+ at line

1:

-+A499E(": table or view does not e'ist

'. ASSESMENT:

Selfstudy1F

)heoryGnowledge"9F

ractical!erform"9F

+e!ort!resentation19F

Sam!le)est =ivauestionss!ot &uiIIes"9F

rofessionalbehavior1F

(. CONCLUSION:

7ote: this has to be write each student individually.


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Q%!)#*+,) + V*/0 + #!",*"0 0))!))!,#:

1. Jhat do you mean by DDL *ommand

EXPERIMENT OF DBMS

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