Difficulty: Moderately Easy instructions.
困难：适度温和的说明。
It's fairly easy to see how any moderately complicated query will rapidly become unworkable using this technique, particularly when compared against the simplicity of a query language like SQL.
很容易看出，使用这种技术使得中等复杂的查询很快就变得不能工作，尤其是与SQL这类查询语言的简单性相比。
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