Oracle- Introduction to Sql commands- Mazenet solution

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This document provides an introduction to SQL and summarizes some key SQL commands. It discusses commands for data definition language (DDL) including CREATE, ALTER, DROP, TRUNCATE, and RENAME. CREATE is used to create new tables, ALTER modifies existing table structures, DROP removes tables, TRUNCATE empties table contents, and RENAME renames tables. Examples are given for each DDL command.

INTRODUCTION TO SQL
Prepared by
Ravichandiran
Senior Oracle Trainer

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COMMANDS
DDL - DATA DEFINITION LANUGAGE
DML - DATA MANIPULATION LANGUAGE
TCL - TRANSACTION CONTROL LANGUAGE
DCL - DATA CONTROL LANGUAGE
DRL - DATA RETRIEVAL LANGUAGE

DDL
• Used to create or modify the structure of the table.
• Auto commit occurs. Changes cannot be rolled
back.
• Session independent commands.
• Commands are :
CREATE, ALTER DROP, TRUNCATE, RENAME

DDL - CREATE
SYNTAX
create table <tab_name>
(
col1 datatype(size),
col2 datatype(size),
...........
.............
coln datatype(size)
);
SYNTAX
create table <tab_name>
(
col1 datatype(size),
col2 datatype(size),
...........
.............
coln datatype(size)
);
EXAMPLE
Create table emp
(
empno number(5),
ename varchar2(20),
job varchar2(20)
);
EXAMPLE
Create table emp
(
empno number(5),
ename varchar2(20),
job varchar2(20)
);

DDL - ALTER
ADD
• ALTER TABLE EMP ADD
DOJ DATE;
• ALTER TABLE EMP ADD
( SALARY NUMBER(5),
COMM NUMBER(4),
DEPTNO NUMBER(3));
ADD
• ALTER TABLE EMP ADD
DOJ DATE;
• ALTER TABLE EMP ADD
( SALARY NUMBER(5),
COMM NUMBER(4),
DEPTNO NUMBER(3));
MODIFY
• ALTER TABLE EMP ADD
DOJ DATE;
• ALTER TABLE EMP ADD
( SALARY NUMBER(5),
COMM NUMBER(4),
DEPTNO NUMBER(3));
MODIFY
• ALTER TABLE EMP ADD
DOJ DATE;
• ALTER TABLE EMP ADD
( SALARY NUMBER(5),
COMM NUMBER(4),
DEPTNO NUMBER(3));

DDL - ALTER
DROP COLUMN
• ALTER TABLE EMP DROP
COLUMN DEPTNO;
• ALTER TABLE EMP
DROP(DOJ,COMM);
DROP COLUMN
• ALTER TABLE EMP DROP
COLUMN DEPTNO;
• ALTER TABLE EMP
DROP(DOJ,COMM);
RENAME COLUMN
• ALTER TABLE EMP
RENAME COLUMN EMPNO
TO ENO;
RENAME COLUMN
• ALTER TABLE EMP
RENAME COLUMN EMPNO
TO ENO;

DDL - DROP
TABLE DROPPED
• DROP TABLE EMP;
• DROP TABLE EMP
PURGE;
• PURGE RECYCLEBIN;
• PURGE TABLE EMP;
TABLE DROPPED
• DROP TABLE EMP;
• DROP TABLE EMP
PURGE;
• PURGE RECYCLEBIN;
• PURGE TABLE EMP;
FLASHBACK COMMAND
• Flashback table emp to
before drop;
• Flashback table emp to
before drop rename to
employees;
FLASHBACK COMMAND
• Flashback table emp to
before drop;
• Flashback table emp to
before drop rename to
employees;

DDL - TRUNCATE
• Used to remove records from table.
• Cannot delete single row alone
• Changes are permanent. So deleted record cannot
be rolled back.
TRUNCATE TABLE EMP;

DDL - RENAME
• Used to rename the table.
RENAME <OLD_TABLE_NAME> TO
<NEW_TAB_NAME>;
RENAME EMP TO EMPLOYEES;

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Oracle- Introduction to Sql commands- Mazenet solution

1. INTRODUCTION TO SQL Prepared by Ravichandiran Senior Oracle Trainer

2. WHY MAZENET? • Oracle Certified Partner & more than 10+ years experienced Trainers. • Oracle unique id for students • E-kits from Oracle University • Course Completion Certificate from Oracle University. • Flexible timing for working professionals. • Preparing candidates to face interview and free resume preparation.

3. COMMANDS DDL - DATA DEFINITION LANUGAGE DML - DATA MANIPULATION LANGUAGE TCL - TRANSACTION CONTROL LANGUAGE DCL - DATA CONTROL LANGUAGE DRL - DATA RETRIEVAL LANGUAGE

4. DDL • Used to create or modify the structure of the table. • Auto commit occurs. Changes cannot be rolled back. • Session independent commands. • Commands are : CREATE, ALTER DROP, TRUNCATE, RENAME

5. DDL - CREATE SYNTAX create table <tab_name> ( col1 datatype(size), col2 datatype(size), ........... ............. coln datatype(size) ); SYNTAX create table <tab_name> ( col1 datatype(size), col2 datatype(size), ........... ............. coln datatype(size) ); EXAMPLE Create table emp ( empno number(5), ename varchar2(20), job varchar2(20) ); EXAMPLE Create table emp ( empno number(5), ename varchar2(20), job varchar2(20) );

6. DDL - ALTER ADD • ALTER TABLE EMP ADD DOJ DATE; • ALTER TABLE EMP ADD ( SALARY NUMBER(5), COMM NUMBER(4), DEPTNO NUMBER(3)); ADD • ALTER TABLE EMP ADD DOJ DATE; • ALTER TABLE EMP ADD ( SALARY NUMBER(5), COMM NUMBER(4), DEPTNO NUMBER(3)); MODIFY • ALTER TABLE EMP ADD DOJ DATE; • ALTER TABLE EMP ADD ( SALARY NUMBER(5), COMM NUMBER(4), DEPTNO NUMBER(3)); MODIFY • ALTER TABLE EMP ADD DOJ DATE; • ALTER TABLE EMP ADD ( SALARY NUMBER(5), COMM NUMBER(4), DEPTNO NUMBER(3));

7. DDL - ALTER DROP COLUMN • ALTER TABLE EMP DROP COLUMN DEPTNO; • ALTER TABLE EMP DROP(DOJ,COMM); DROP COLUMN • ALTER TABLE EMP DROP COLUMN DEPTNO; • ALTER TABLE EMP DROP(DOJ,COMM); RENAME COLUMN • ALTER TABLE EMP RENAME COLUMN EMPNO TO ENO; RENAME COLUMN • ALTER TABLE EMP RENAME COLUMN EMPNO TO ENO;

8. DDL - DROP TABLE DROPPED • DROP TABLE EMP; • DROP TABLE EMP PURGE; • PURGE RECYCLEBIN; • PURGE TABLE EMP; TABLE DROPPED • DROP TABLE EMP; • DROP TABLE EMP PURGE; • PURGE RECYCLEBIN; • PURGE TABLE EMP; FLASHBACK COMMAND • Flashback table emp to before drop; • Flashback table emp to before drop rename to employees; FLASHBACK COMMAND • Flashback table emp to before drop; • Flashback table emp to before drop rename to employees;

9. DDL - TRUNCATE • Used to remove records from table. • Cannot delete single row alone • Changes are permanent. So deleted record cannot be rolled back. TRUNCATE TABLE EMP;

10. DDL - RENAME • Used to rename the table. RENAME <OLD_TABLE_NAME> TO <NEW_TAB_NAME>; RENAME EMP TO EMPLOYEES;

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