Solution to Sql-Sum by codility

21 Sep

Question: Question Name: Sql-Sum or SqlSum This question is too easy to be a serious training lesson. Most likely, it’s a live test for SQL challenges on The following solution works in both PostgreSQL and SQLite.

Solution to Combine Two Tables by LeetCode

28 Feb

Question: Question Name: Combine Two Tables This problem is used to check our knowledge in JOIN. LEFT JOIN is used here. But we should also know about the others like INNER JOIN, RIGHT JOIN and OUTER JOIN.