How do I add indices to MySQL tables?

How do I add indices to MySQL tables?

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Storing JSON in database vs. having a new column for each key

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MYSQL OR vs IN performance

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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)

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Does adding 'LIMIT 1' to MySQL queries make them faster when you know there will only be 1 result?

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delete all from table

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MySql views performance [closed]

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Measuring actual MySQL query time

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Creating an index on a timestamp to optimize query

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GROUP BY having MAX date

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Using index, using temporary, using filesort - how to fix this?

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MySQL not using indexes with WHERE IN clause?

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The best way to get the first and last day of last month?

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"SELECT COUNT(*)" is slow, even with where clause

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Speeding up row counting in MySQL

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