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15 lines
648 B
Markdown
15 lines
648 B
Markdown
---
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title: 'You can create DB indices for transformed versions of columns'
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tweet_id: '1512463807167139846'
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thread_slug: weekly-thread-2022-14
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author_username: tobias_petry
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images:
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- 'https://pbs.twimg.com/media/FPk6CjSWYAAXwyn.jpg'
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created_at: 2022-04-08T16:14:06+00:00
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slug: you-can-create-db-indices-for-transformed-versions-of-columns
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---
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⚡️ Database Tip
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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.
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https://sqlfordevs.com/function-based-index
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