单选题Which pseudocolumn could you use to identify a unique row in a Flashback Versions Query？（）A XIDB VERSIONS_PKC VERSIONS_XIDD VERSIONS_UNIQUE
单选题
Which pseudocolumn could you use to identify a unique row in a Flashback Versions Query？（）
A
XID
B
VERSIONS_PK
C
VERSIONS_XID
D
VERSIONS_UNIQUE
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