SQL injection is a code injection technique attackers use to gain unauthorized access to a database by injecting malicious SQL commands into web page inputs....
Express JS is a JavaScript framework that is used for building the backend of web and mobile applications. It works on top of Node JS which is helpful for managing servers and routes. Connecting an Express JS application to MongoDB and MySQL requires installing Node.js in your computer system. In this article, we will see how we can connect the Express.js application to MongoDB and MySQL....
In this article, we will discuss the overview of SQL Query to Calculate the Number of Months between two specific dates and will implement with the help of an example for better understanding. Let’s discuss it step by step....
To find all the Sundays in between two days using SQL Language, we will be using the “Date Functions” defined in SQL. Apart from these we will be using CTE ( View) idea too....
1. FLOOR() Function : The FLOOR() function in MySQL is a mathematical function that returns the largest integer value that is less than or equal to a given numeric expression. It rounds down a given numeric value to the nearest integer value that is less than or equal to the original value....
The Common Table Expressions (CTE) were introduced into standard SQL in order to simplify various classes of SQL Queries for which a derived table was just unsuitable. CTE was introduced in SQL Server 2005, the common table expression (CTE) is a temporary named result set that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement. You can also use a CTE in a CREATE view, as part of the view’s SELECT query. In addition, as of SQL Server 2008, you can add a CTE to the new MERGE statement....
This basic to advanced SQL tutorial covers the entire SQL syllabus in a structured way and provides the best learning material and strategies to master complete SQL in 30 Days. We have laid out the complete SQL roadmap, and following this roadmap, you will learn all the concepts of SQL....
Window functions apply to aggregate and ranking functions over a particular window (set of rows). OVER clause is used with window functions to define that window. OVER clause does two things :...
1. CHAR Datatype: It is a datatype in SQL which is used to store character string of fixed length specified. If the length of the string is less than set or fixed-length then it is padded with extra blank spaces so that its length became equal to the set length when PAD_CHAR_TO_FULL_LENGTH SQL mode is enabled. The storage size of the CHAR datatype is n bytes(set length). We should use this datatype when we expect the data values in a column are of the same length....
DDL is a Data Definition Language that is used to define data structures. For example: creating a table, and altering a table are instructions in SQL. DML is a Data Manipulation Language that is used to manipulate data itself. For example: insert, update, and delete are instructions in SQL....
