A subquery can be used to（）.<br>A:create groups of data<br>B:sort data in a specific order<br>C:convert data to a different format<br>D:retrieve data based on an unknown condition

A subquery can be used to（）.
A:create groups of data
B:sort data in a specific order
C:convert data to a different format
D:retrieve data based on an unknown condition

出自：Oracle认证

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