PromotionOct 21, 2026
Use The Index, Luke: a clear guide to SQL indexing
A database-neutral explanation of indexing that goes well beyond ‘add an index when the query feels slow’.
This is the resource I send when someone understands basic SQL but treats indexes as magic. It starts with the data structure, follows the path of a lookup, and then shows why concatenated index order and functions on indexed columns matter.
The rest is for members.
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#sql#databases#performance
