SQL is a standard language for storing, manipulating and retrieving data in databases. It is used by many database systems like Oracle, Microsoft SQL Server, MySQL, and PostgreSQL. SQL allows users to define data structures, manipulate data, and control access to databases. The language includes commands like SELECT to query data, INSERT to add new data, UPDATE to modify existing data, and DELETE to remove data from databases.

2. SQL)
SQL (
SQL)
Sequel)
Structured Query Language

3. SQL
research center
Sequel)
SQL)
almaden
IBM
SQL
SQL
ORACLE
ACCESS SQL Base
Sybase INGRES
SQL Server
Microsoft
American National
Standards Institute (ANSI)
SQL

4. SQL
SQL
SQL (The subdivision
of sql)
Data Definition
Language : DDL)
Data
Manipulation Language : DML)

5. SQL
SQL
data type)
SQL
character)
numeric)
SQL
SQL
DBMS
DBMS

6. SQL
SQL
SQL
SQL
SQL
SQL
SQL
control statement)
if..then…else for…do
SQL
SQL
loop
while
SQL

7. SQL
rows)
columns)
Data Definition Language : DDL)
SQL
sehema)
SQL
CREATE TABLE
CREATE

8. constraints)
integrity)
integrity)
NOT NULL)
NOT NULL”
primary key)
NULL )
NOT

9. primary key)
)
foreign key )
SALENO
CHECK)
entity integrity)

10. comma (,)
4.3
semicolon (;)
DROP TABLE

11. - ALTER TABLE
- ALTER TABLE
ALTER TABLE
ALTER TABLE
unique)
CUSNO)
CUSTOMERTAB)
integrity)

12. Index)
DBMS

13. DROP INDEX
SQL
Data manipulation Language :
DML)
SQL
SQL
CREATE TABLE