Introduction Lets get started at an apparently unrelated point. Lets assume we create a table in SQL. Now there are three main parts of a database management system, like SQL. They are - Creating structure of table Entering data Making queries (and getting meaningful results from data) Now, when SQL is used to display data on a web page, it is common to let web users input their own queries. For example, if you go to a shopping website to buy a smartphone, you might want to specify what kind of smartphone you want. The site would probably be storing data about phones in table with columns like Name, Price, Company, Screen Size, OS, etc. Now they allow you to create a query using some sort of user friendly drop down based form which lets you select your budget, preferred company, etc. So basically, you, the user, can create queries and request data from their SQL servers. Now this automated method of creating queries for you is relatively safe, there is another method of creating q...
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