Retrieve the Last 12 Months of Data in SQL

Learn how to effectively query the last 12 months of data in SQL using simple date functions.

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To get the last 12 months in SQL, you can use a query that applies a date function and filtering. For example in SQL Server: `SELECT DATEADD(MONTH, -i, GETDATE()) AS Month FROM TallyTable WHERE i < 12;`. This will generate the last 12 months from the current date. Alternatively, for MySQL: `SELECT DATE_SUB(NOW(), INTERVAL i MONTH) AS Month FROM TallyTable WHERE i < 12;`. Ensure you have a tally table with numbers 0-11 for the range.

FAQs & Answers

  1. How do I create a tally table in SQL? A tally table can be created using a simple SELECT statement that generates a range of numbers, usually from 0 to 11 for extracting the last 12 months.
  2. What are SQL date functions? SQL date functions are built-in functions that allow you to manipulate and work with dates in your database, such as adding or subtracting time intervals.
  3. What is the difference between SQL Server and MySQL? SQL Server is a relational database management system by Microsoft, while MySQL is an open-source relational database management system. They have different syntax for date functions and other features.

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For further insights into SQL queries, check out our related videos on SQL date handling and advanced querying techniques. Mastering these skills can enhance your data analysis capabilities.

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