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94ms (σ = 6ms, n = 58)。业内人士推荐新收录的资料作为进阶阅读
We often see users reaching for the Nullable type, which allows columns to store a Null value. Under the hood, this creates a separate column of UInt8 type. This additional column has to be processed every time a user works with a Nullable column. This leads to additional storage space used and almost always negatively affects performance.，详情可参考新收录的资料
但陆子天终究是个广东人，创业这件事早已深入血液。他在学校学音乐，回到家里却总琢磨着编程和各种科技产品。