Example 4: Collect catalog statistics on key columns and on one column that is not.
示例4：收集关键列上和一个非关键列上的目录统计信息。
Once you press the Enter key, you will see statistics similar to the following.
按下enter键后，您将看到类似如下的统计数据。
Once you press the Enter key, you will see statistics similar to the following.
按下enter键后，您将看到类似如下的统计数据。
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