I have been working on sql server and front end coding and have usually faced problem formulating queries.

I do understand most of the concepts of sql that are needed in formulating queries but whenever some new functionality comes into the picture that can be dont using sql query, i do usually fails resolving them.

I am very comfortable with select queries using joins and all such things but when it comes to DML operation i usually fails

For every query that i never done before I usually finds uncomfortable with that while creating them. Whenever I goes for an interview I usually faces this problem.

Is it their some concept behind approaching on formulating sql queries.

Eg.

I need to create an sql query such that

A table contain single column having duplicate record. I need to remove duplicate records. 

I know i can find the solution to this query very easily on Googling, but I want to know how everyone comes to the desired result.

Is it something like Practice Makes Man Perfect i.e. once you did it, next time you will be able to formulate or their is some logic or concept behind.