试题详情
- 单项选择题 Examine the following command that is executed for the TRANSPORT table in the SH schema:
Which statement describes the significance of this command?（） 
A、It collects statistics into the pending area in the data dictionary
B、It creates a virtual hidden column in the CUSTOMERS_OBE table
C、It collects statistics with AUTO_SAMPLE_SIZE for ESTIMATE_PERCENT
D、It creates a histogram to hold skewed information about the data in the columns
- B
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