MAX 总是处理所有行 - 使用 order by 和 limit - 所以查询看起来会这样

MAX always process all rows - use order by and limit - so query will look this way

 SELECT * FROM wbsites WHERE url = '...' ORDER BY id DESC LIMIT 1

对于这种情况，不需要子查询

For this case subquery is not required

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