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Constraints are used to apply some rules for the record in a table. If any rule is violated between constraint and data, then the action is aborted by
In previous article we have discussed about SQL and some queries. In this part we will continue on SQL Queries: Customer IdNameAddressContact Marks
SQL stands for Structured Query Language. The structured query language is used to manipulate and access the databases. SQL is an ANSI (American Natio
These functions return a single value, calculated from the values in the column.Scalar functions return a single value, based on input data. Following
Sometimes beginners get confused how to login and logout. So I thought it would be helpful if I share some basic steps how to create login and logout
In our previous section, of inheritance we have seen how derived class (or child class) inherits the function or methods of base class (or parent clas
Type Hinting is a technique that hints the function to accept only given data types. In PHP we can use type hinting for array, object and callable dat
Objects are inconstant, that means object has capability to change the state of information. In object oriented PHP programming, there can be a situat
Method chaining is a technique in which methods are put together one after the other. For example you have a class employee and have three methods lik
Abstract classes are those classes which cannot be instantiated and require subclasses to provide implementation for the abstract methods or in other
Static method in PHP is very useful features. Static function and variable breaks a lot of power available to 0bject oriented programming. These metho
The CREATE DATABASE statement is used to create database. (Note: Before creating database you must first connect with database server).Here is an exam
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