SQL Server performance tuning and SQL query optimization are some of the main aspects for database developers and administrators. They need to carefully consider the usage of specific operators, the number of tables on a query, the size of a query, its execution plan, statistics, resource allocation, and other performance metrics – all that may improve and tune query performance or make it worse.
For better query performance, we recommend using tips and techniques presented in the article, such as running queries at off-peak hours, creating indexes, retrieving data only for the specific columns, applying the correct filter, joins, and operators, as well as trying not to overload queries.
In addition, we propose some recommendations which may not directly relate to coding techniques, but they can still help you write precise and efficient SQL code.
Use uppercase for keywords
Keywords in SQL are generally case-insensitive. You can use lower case, upper case, or both mixed across all popular database management systems, including Microsoft SQL Server. However, it is recommended to use the upper case for keywords for improved code readability.
Although some developers may find it cumbersome to switch between upper and lower case while coding, modern SQL code formatting tools provide the functionality to configure case usage, text coloring, indents, and other options. These tools can automatically apply the preferable formatting while typing.
Write comments for your SQL code
Commenting on the code is optional, but it is highly recommended. Even if some code solutions seem obvious at the moment, what happens in a couple of months when you need to revisit it, especially after writing lots of other code for different modules or projects? This is especially important for your colleagues who will have to work with your code.
Another essential point is to review your existing comments whenever you make changes to your code, ensuring that they remain relevant. It may take time, but it greatly improves the readability of your code, and your efforts will pay off.
Use a professional SQL code editor
As a developer, you may apply various techniques and customize your workflows according to your preferences, but creating code manually from scratch consumes a lot of time and demands exceptional precision. A reliable and potent SQL editor makes code writing easier and enhances accuracy.
Modern SQL editors offer robust functionality for query development, such as auto-completion options, libraries of code snippets, syntax validation, and code formatting. Advanced tools for SQL development allow developers to double the coding speed twice (at least) and guarantee outstanding code quality.
