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content/tips/you-can-create-db-indices-for-transformed-versions-of-columns.md
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@ -12,4 +12,4 @@ slug: you-can-create-db-indices-for-transformed-versions-of-columns
Most developers are puzzled that indexes are not used for e.g. WHERE LOWER(email) = ?. But contrary to common belief, an index can be created for these cases! It's called a function-based index and is supported by MySQL and PostgreSQL. Most developers are puzzled that indexes are not used for e.g. WHERE LOWER(email) = ?. But contrary to common belief, an index can be created for these cases! It's called a function-based index and is supported by MySQL and PostgreSQL.
https://sqlfordevs.io/tips/function-based-index?utm_source=twitter&utm_medium=social&utm_campaign=database_tip_2022_04_05 https://sqlfordevs.io/tips/function-based-index