Today i've suffered some issue with a SSH key. I've tried to clone my repository from Gitlab.com.

Unfortunately i've received an error:

Permission denied (publickey,keyboard-interactive)

I've thought, i have problem with a SSH key. Unfortunately, adding a SSH key did not resolve the problem.

How to resolve it?

Elasticsearch is just an amazing search engine with a lot of flexibility.

You can think, that working with this tool is very hard, but actually, it is not.

Today I will show you, how to use Elasticsearch through the Searchkick gem.

In this article you will get the knowledge about different conditional statements which are appearing in SQL language.

You will know how to execute SQL query only when some conditions are met.

SQL beginners can have some problems with understanding how Self-Join works. But everybody should understand
how handy this query type is. It helps us to combine two records inside same table into single row.

This thing is widely used on some level of programming and for sure we all sure understand, how to use it.

Sometimes you can realize, one query is not enough to get the information you want.
It just feels like you need to do it "in steps". Thank god, we have Subqueries in SQL.

Subqueries will help you make more complex SQL queries and i will show you how to write them.

In the previous article we were talking about INNER JOINS. Today we will try to understand OUTER JOINS with all their types.

If you want to understand how they work - this is place for you, just click Read more :)