Beginner SQL Tutorials

How to Comment in SQL

How to Comment in SQL

A comment in SQL can be used in a couple of different ways. One usage of SQL comments is to provide documentation about what your code is doing. This is often helpful if you have complicated queries that need more explanation. It can help other SQL developers...
How to Sum in SQL

How to Sum in SQL

One of the most basic things you need to know how to do when beginning to writing SQL queries is how to sum in SQL. This is the process of taking a result set and adding up the values of all the records within a certain column of each row. A common...
Querying Where Null in SQL

Querying Where Null in SQL

A particularly confusing aspect of writing queries is querying where NULL in SQL. What does that mean exactly? Null is a special type of operator in SQL. It is essentially the absence of a value. As such, we have to handle queries against columns...
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