Hi,
Many times I stacked into my work when I start using SQL. So here are some SQL tips and solutions. Read it and enjoy.
SQL is the standard language for Relation Database System. All relational database management systems like MySQL, MS Access, Oracle, Sybase, Informix, postgres and SQL Server use SQL as standard database language.
I will add more content to this in upcoming days. Till then keep reading.
Many times I stacked into my work when I start using SQL. So here are some SQL tips and solutions. Read it and enjoy.
What is SQL?
SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database.SQL is the standard language for Relation Database System. All relational database management systems like MySQL, MS Access, Oracle, Sybase, Informix, postgres and SQL Server use SQL as standard database language.
Why SQL?
- Allows users to access data in relational database management systems.
- Allows users to describe the data.
- Allows users to define the data in database and manipulate that data.
- Allows to embed within other languages using SQL modules, libraries & pre-compilers.
- Allows users to create and drop databases and tables.
- Allows users to create view, stored procedure, functions in a database.
- Allows users to set permissions on tables, procedures, and views
SQL Commands:
The standard SQL commands to interact with relational databases are CREATE, SELECT, INSERT, UPDATE, DELETE and DROP. These commands can be classified into groups based on their nature:DDL - Data Definition Language:
Command | Description |
---|---|
CREATE | Creates a new table, a view of a table, or other object in database |
ALTER | Modifies an existing database object, such as a table. |
DROP | Deletes an entire table, a view of a table or other object in the database. |
DML - Data Manipulation Language:
Command | Description |
---|---|
SELECT | Retrieves certain records from one or more tables |
INSERT | Creates a record |
UPDATE | Modifies records |
DELETE | Deletes records |
DCL - Data Control Language:
Command | Description |
---|---|
GRANT | Gives a privilege to user |
REVOKE | Takes back privileges granted from user |
I will add more content to this in upcoming days. Till then keep reading.