How Can I Efficiently Left-Pad a VARCHAR in T-SQL?
Published on 2025-01-30
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Optimizing Left-Padding of VARCHARs in T-SQL
Standard T-SQL left-padding techniques often rely on functions like REPLICATE and LEN, resulting in suboptimal performance. A more efficient alternative is:
RIGHT('XXXXXXXXXXXX' RTRIM(@str), @n)Here:
- 'X' represents the padding character.
@nspecifies the final padded string length.@stris the input string.
This approach efficiently pads @str to the desired length using 'X'. However, it's crucial to minimize database-level padding operations due to potential performance bottlenecks. The best practice is to handle padding within the application layer, thereby enhancing overall SQL query efficiency.
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