It's not particularly efficient if you have relations between tables in your schema, which you most likely do.

如果您的架构中的表间存在一些关系(这种可能性很大)，那么这个代码不是特别有效。

youdao

The factor builder returns the answer that trend-following has not been particularly efficient when cross applied to FX assets in general (though you can data mine to make it look good as most technical analysis books do).

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Like other iron minerals, green rust readily absorbs dissolved elements onto its surface, but green rust is not only particularly efficient at this in many cases, it can also react with toxic dissolved trace metals to make them insoluble, and as a result, renders them in nontoxic forms.

MSN: What green rust did long ago to the big blue ocean