Most of the tables in the work items snapshot include the WI_COUNT column, which shows the sum of the work items that have matching characteristics.
工作项快照的大多数表格都包含有wi_count列，它显示了匹配特征的一些工作项。
The nullability characteristics of each column must be the same.
每列的为空性（nullability）特征必须相同。
In our previous column, we discussed software security analysis at a high level, introduced a methodology for assessing software security, and explained the key characteristics of a risk analysis.
在上一专栏中，我们从较高层次讨论了软体安全性的分析，介绍了软体安全性的方法，并且说明了风险分析的关键特性。
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