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All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.

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How to create a conditional index in MySQL?

MySQL currently doesn't support conditional indexes. To achive what you are asking (not that you should do it ;) ) you can start creating an auxiliary table: CREATE TABLE `my_schema`. … auxiliary_table.id = main_table.id ORDER BY auxiliary_table.name; If the main table already contains data, or in case you make some external operation that changes data in an unusual way (E.G.: outside MySQL
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