How Can I Preserve Ordering When Using SQL's IN() Clause?

Use SQL IN() clause to maintain order

When sorting results, it can be challenging to keep the results consistent with the order of the values ​​specified in the IN() clause. This problem can be solved using a subquery or a temporary table, but is there a more efficient solution?

In MySQL, the FIELD() function provides a viable option. By utilizing the FIELD() function, you can directly manipulate sorting based on the order of values ​​in the IN() clause.

<code class="language-sql">SELECT name, description, ...
FROM ...
WHERE id IN([ids, 无序])
ORDER BY FIELD(id, [ids, 有序])</code>

The FIELD() function determines the index in the provided list of the value passed as the first argument. The index returned represents the order of the value in the list.

For example:

<code class="language-sql">FIELD('a', 'a', 'b', 'c')  -- 返回 1
FIELD('a', 'c', 'b', 'a')  -- 返回 3</code>

By using the FIELD() function and maintaining the corresponding order of the values ​​in the IN() clause and FIELD() function, you can effectively make the order of the results consistent with the desired order.

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