SQL
What is SQL?
SQL stands for Structured Query Language. SQL lets you access and manipulates databases. According to the American National Standards Institute, it is the standard language for relational database management systems.
when
When should you use SQL views?
One of the simplest reasons to use an SQL view is when you have a long and complex query. To save time on retyping and running the query, you can store it in a view and simply run the SELECT statement on that view.
where
Where is the data source located in SQL?
A data source, in the context of computer science and computer applications, is the location where the data that is being used comes from. In a database management system, the primary data source is the database, which can be located on a disk or a remote server.
who
Who uses SQL?
Web developers and data scientists access data through IT systems. One method for accessing data from multiple systems is SQL.
why
Why is SQL used?
SQL is used to communicate with a database. The intention of SQL is to store, retrieve, manage and manipulate data within a database management system.
how
How do SQL tables work?
SQL uses a set of commands to manipulate the data in databases. Examples include SQL INSERT, which is used to add data to database tables; SQL SELECT, which retrieves data from database tables; and SQL UPDATE, which modifies existing database records.
How many
How many SQL commands are there?
There are five types of SQL commands:
- DDL: Data Definition Language.
- DML: Data Manipulation Language.
- DCL: Data Control Language.
- TCL: Transaction Control Language.
- DQL: Data Query Language.
Bindu shree S
