Back in August of 2020, The Many Flavors of the SQL Count() Function provided an overview of COUNT's many input parameter variations. Another way to use the COUNT() function is to combine it with the GROUP BY clause. Using the COUNT() function in conjunction with GROUP BY is useful for breaking down counts according to various groupings. In today's blog, we'll learn how to group counts by different criteria by querying the Sakila Sample Database using Navicat Premium as our database client.
Part 4: Miscellaneous Functions
This last category of important SQL Server functions includes those that deal with nulls, conversion, and control flow. Far from leftovers, these functions are among some of the most useful you'll ever come across!
COALESCE
Anytime you select a column whose value is not mandatory, you're bound to encounter null values. That only makes sense, because null values represent absent or missing information. Trouble is, nulls can reek havoc when included in calculations as well as other operations that one might perform on column data.
Part 3: Date Functions
After twenty years in IT, I can confirm that dates and times can be notoriously difficult to work with. Thankfully, modern relational databases like SQL Server provide a wealth of highly useful functions for this purpose. In today's blog, we'll explore some of the most popular ones.
Part 2: Numeric Functions
Like most modern relational database offerings, SQL Server comes loaded with an impressive collection of built-in functions. While some functions are amazingly similar across the board, exact names and signatures may vary. Therefore, it's a good idea to brush up on the SQL Server specific implementations of common SQL function. In part 1 of this series, we explored string functions. In today's installment, we'll be moving on to numerical functions, a category that is highly useful in the generation of statistics and calculated values!
Part 1: String Utilities
There are certain functions that seem to come up in every programming language. Although SQL differs from your typical procedural programming language like C# or Java in many ways, it too comes equipped with an impressive assortment of built-in functions. These may be applied to Char, Varchar, and Text data types. Each database vendor does not implement functions in exactly the same way, so it pays to familiarize yourself with functions that are specific to the database you work with. In this series, we'll be taking a look at a few important SQL functions, as implemented by SQL Server. Today's blog will tackle string functions, while subsequent installments will explore numerical, date functions, and more!
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