How can a MySQL query with a very extensive "WHERE...IN (...)" condition be written?

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There are several ways to optimize a MySQL query with a very extensive "WHERE...IN (...)" condition:

1. Use the "EXISTS" keyword instead of "IN" - this can often result in faster queries as it allows the database to stop searching as soon as it finds a match.

2. Use a subquery to reduce the number of items in the "IN" list - for example, you may be able to create a subquery that uses a more restrictive condition to filter the results before checking if they are in the main "IN" list.

3. Ensure that the column being used in the "IN" condition is indexed to improve querying efficiency.

4. Use "JOIN" operations to filter the results based on other tables rather than relying solely on the "IN" condition.

5. Consider using a temporary table to populate the values for the "IN" condition and then joining to that table for your query. This can be particularly useful for very large lists of values.