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Blind SQL (Structured Query Language) injection is a type of SQL Injection attack that asks the database true or false questions and determines the answer based on the applications response. … This makes exploiting the SQL Injection vulnerability more difficult, but not impossible. . What is blind SQL injection attack can it be prevented? As …
How do you manage session in PHP? To handle session, you must first start it and store some value to any session variable. You can create any amount of session variable you wish. To validate whether Session is active or not, we use isset() function and finally to destroy it we use unset() function. What …
The reference variable of the Parent class is capable to hold its object reference as well as its child object reference. In Java, methods are virtual by default (See this for details). Can we assign parent object to child objects in Java? The parent class can hold reference to both the parent and child objects. …
The GROUP_CONCAT() function in MySQL is used to concatenate data from multiple rows into one field. This is an aggregate (GROUP BY) function which returns a String value, if the group contains at least one non-NULL value. How do I concatenate multiple rows in a single column in SQL? You can concatenate rows into single …