MySQL Performance: Is `IN` Significantly Faster Than `OR` for Multiple Conditions?

MySQL OR and IN performance comparison

When exploring the performance impact of different SQL syntaxes, developers often question the efficiency of the OR clause and the IN clause. Since both methods are used to check multiple conditions, it's important to understand the difference in their execution speed.

To determine the performance gap between the OR and IN clauses, we conducted a comprehensive benchmark. The results consistently show that IN clauses perform significantly better than OR clauses.

To illustrate more intuitively, we executed a loop containing 1000 queries, using the OR and IN clauses respectively to verify the performance. The OR clause takes 5.83 seconds to complete, while the IN clause only takes 2.34 seconds, which demonstrates the significant speed advantage of the IN clause.

To provide a concrete example, we used Eloquent syntax to create the simplest use case. A OR clause query contains multiple ORWhere conditions, while a IN clause query uses a single whereIn condition. The test results show that the IN clause is executed within 2.15 seconds, while the OR clause takes 3 seconds, further consolidating the performance superiority of the IN clause.

In summary, the benchmark provides empirical evidence that the IN clause is significantly faster than the OR clause when checking multiple conditions in a MySQL query. Therefore, developers should prioritize using the IN clause to optimize the performance of MySQL applications.

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