Beaten rice(chiura) pakoda

Beaten rice(chiura) pakoda

Wordpress- versatile Content Management System (CMS)

Hey beginners, if you are confused on choosing plateform to develop you website. Then don't be. I will tell you, why you should choose Wordpress to develop your websites.

Wordpress is a very versatile Content Management System (CMS) which was evolved with the concept of blogging platform. Now Wordpress is more than ten years old and in these time, it has evolved through fully functional websites, mobile applications and ecommerce. While you can still use WordPress to create a simple blog, no doubt on it.

Join in MySQL

Join clause is used to combine rows from two or more tables depending upon common field between them.

There are different kinds of Joins.

The most common and useful Join is Inner Join.

Inner Join:
It will return all rows from multiple tables where the condition is met.

Aggregate Functions in MySQL

Aggregate Functions are those functions which are used in SQL. They return a single value which is calculated from values in the columns from a particular table.

The aggregate functions are below:

AVG()- It returns a average value
COUNT() - It returns the number of rows in a table
MAX() - It returns the maximum value stored in a table
MIN() - It returns the minimum value stored in a table
SUM() - It returns the sum of all the values of specified column

Cursors

What are Cursors?

A cursor is a temporary work area created in the system memory when a SQL statement is executed. A cursor contains information on a select statement and the rows of data accessed by it. This temporary work area is used to store the data retrieved from the database, and manipulate this data. A cursor can hold more than one row, but can process only one row at a time. The set of rows the cursor holds is called the active set.

There are two types of cursors in PL/SQL:

Implicit cursors:

These are created by default when DML statements like, INSERT, UPDATE, and DELETE statements are executed. They are also created when a SELECT statement that returns just one row is executed.

Between and In Operators in SQL

Between Operator

It is used to select values within a range.

SubQuery in MySQL

A subquery is a query inside another query or it is a nested query which is embedded within the WHERE clause.

Subqueries can be used with the SELECT, INSERT, UPDATE, and DELETE statements along with the operators like =, <, >, >=, <=, IN, BETWEEN etc.