# Set number of columns[设置列数] # Identity covariance model (no need to specify matrix dimensions)[身份的协方差模型（不需要指定矩阵尺寸）] # Define den...
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While all rows in a result set share the same number of columns and column types, different result sets can have different column layouts.
一个结果集中的所有行具有相同的列数量和列类型，而不同的结果集可以具有不同的列布局。
The View Configuration contains Settings to limit the number of items returned at a time, and control how many columns (attributes) are displayed in the result set.
View Configuration中的设置可以限制每次返回的条目数量，以及控制在结果集中显示多少列(属性)。
To initialize GridLayout, you simply set the number of columns.
为了初始化gridlayout，您只要设置列数。
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