DDL(Data definition language) is a syntax for defining data structures like databases. Common DDL statements are CREATE, ALTER, RENAME, DROP AND TRUNCATE. The CREATE TABLE statement is used to create a new table with columns and datatypes. The ALTER TABLE statement modifies existing tables by adding, deleting, or changing columns. The RENAME statement renames existing tables, while DROP TABLE removes tables and TRUNCATE TABLE empties table contents but keeps the table.

1. DDL(Data definition language):
(Oprations on table)
A data definition language is a syntax for
defining data structures, especially database.
Common DDL statements are CREATE, ALTER,
RANAME,DROP AND TRUNCATE.

2. • Must begin with a letter
• Can be 1-30 characters long
• Must contain only A-Z,a-z,0-9,_,$,and #
• Must not duplicate the name of another
object owned by the same user
• Must not be an oracle serve reserved word

3. 1:CREATE TABLE
2:ALTER TABLE
3:RENAME TABLE
4:DROP TABLE
5:TRUNCATE TABLE

4. The SQL CREATE TABLE Statement
 The CREATE TABLE statement is used to
create a new table in a database.
 Syntax
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
....
);

5. SQL ALTER TABLE Statement
 The ALTER TABLE statement is used to add,
delete, or modify columns in an existing
table.
 ADD COLUMN
 Syntax
 ALTER TABLE table_name
ADD column_name datatype;

6.  DROP COLUMN
 The syntax to drop a column in an existing
table in SQL.
 SYNTAX
ALTER TABLE table_name
DROP COLUMN column_name;

7.  RENAME COLUMN
 The syntax to rename a column in an existing
table in SQL.
 SYNTAX
ALTER TABLE table_name
RENAME COLUMN column_name to new-name;

8.  MODIFY COLUMN
 You can use the ALTER TABLE statement in
SQL Server to modify a column in a table.
 BEFORE MODIFYING CHECK THAT YOUR
COLUMN IS EMPTY.
 SYNTAX
ALTER TABLE table_name
MODIFY column_name datatype;

9. The SQL RENAME Statement
The RENAME statement is used to Rename TABLE
in a database.
 Syntax
RENAME table_name
TO NEW TABLE_NAME ;

10.  The SQL DROP TABLE Statement
 The DROP TABLE statement is used to drop
an existing table in a database.
 Syntax
 DROP TABLE table_name;

11.  SQL TRUNCATE TABLE
 The TRUNCATE TABLE statement is used to
Remove all rows from table but not table.
 Syntax
 TRUNCATE TABLE table_name;