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Question 27 - DEA-C01 discussion
Partition columns optimize query performance by pruning out the data files that do not need to be scanned (i.e. partitioning the external table). Which pseudocolumn of External table evaluate as an expression that parses the path and/or filename information.
A.
METADATA$ROW_NUMBER
B.
METADATA$COLUMNNAME
C.
METADATA$FILEPATH
D.
METADATA$FILENAME
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