Scenarios for usage of SQL DB

When do I go for a SQL and when do I choose the no SQL is a common question. If you have different kind of data, you have different kind of entities in the system that are related, a typical line of business application if you take would have such a name there are going to be hundreds and two hundreds of table which are completely different in nature, if you are going to handle such an application the no SQL at the back end you going to write lot of code to do that, so that is when SQL DB makes a lot of sense. So,