How Can I Efficiently Left-Pad VARCHAR Strings in T-SQL?

Optimizing Left-Padding for VARCHAR Strings in T-SQL

Common T-SQL left-padding techniques using REPLICATE and LEN can be computationally expensive. For improved performance, consider this alternative using the RIGHT function:

RIGHT('XXXXXXXXXXXX' + RTRIM(@str), @n)

In this example, 'X' is your chosen padding character, and @n represents the desired final string length. This approach avoids the overhead of repeated string replication and length calculations, leading to faster execution.

It's crucial to remember that performing padding directly within SQL queries can impact database performance. Ideally, handle string padding within your application layer for optimal efficiency.

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