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What makes an SQL query SARGABLE?
Here’s the thing.
SARGABLE means Search ARGument ABLE. It simply means your SQL query is written in a way that allows the index to be used efficiently.
If your WHERE condition applies a function on the column, the index usually cannot be used.
Example that is NOT SARGABLE:
WHERE YEAR(order_date) = 2025
Here, SQL has to calculate YEAR(order_date) for every row. That often leads to a full table scan.
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