What's the Fastest and Most Efficient Method for Creating a Numbers Table?

Choose the best way to create and populate tables of numbers

When creating and populating numeric tables, the "best" approach should balance optimal indexing with fast row generation and concise code. Based on these criteria, the following is an analysis of various methods:

Method 1: Loop insertion (slow)

This method inserts rows through a loop, resulting in inefficient row generation.

Method 2: Incremental insertion (faster)

This method uses a while loop to incrementally insert rows, thereby improving row generation performance.

Method 3: Single INSERT using recursion (medium)

This method uses a WITH clause with recursion to populate the table, striking a balance between row generation and code simplicity.

Method 4: “Half Loop” Insertion (Medium)

This method uses a loop with a GO statement, which may cause timing changes.

Method 5: Single INSERT using powers of 2 (fast)

This method uses recursive common table expressions (CTEs) with powers of 2 to populate the table, allowing for fast row and column generation.

Method 6: Single INSERT using CROSS JOIN (very fast)

This method utilizes CROSS JOIN to populate the table, achieving excellent row generation performance.

Method 7: Single INSERT using IDENTITY (fastest)

This method utilizes the IDENTITY function to generate and insert rows, providing the fastest row generation and simple code.

Conclusion

Based on the analysis of these methods, Method 7 (Single INSERT using the IDENTITY function) stands out as the most efficient and straightforward way to create and populate a table of numbers.

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