这将使用空间线性列的数量。

This will use space linear in the number of columns.

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但随着列的数量与时俱增，这个策略可能会变得难以维护。

This strategy might become difficult to maintain as the number of columns increases over time.

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换言之，它们必须包含相同数量和顺序的列。

In other words, they must contain the same number and sequence of columns.

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CustomerID列用于显示每种职业客户记录的数量。

The Customer ID column is used to show the number of customer records per profession.

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一个表可以有任意数量的受保护的列。

A table can have any number of protected columns.

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一个给定表中的所有行具有相同数量的列。

All rows in a given table have the same number of columns.

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对于文献，您可以把每个产品系列的总数量列在一张表上。

For literature you can list the total quantity of each category on one form.

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对于文献，您可以把每个产品系列的总数量列在一张表上。

For literature you can list the total quantity of each category on one form.

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