单项选择题
A.During a query’s parse time only.
B.During a query’s execution time only.
C.During any kind of DML statement execution.
D.During the execution of an INSERT statement only.
多项选择题 Whichtwoaretrueregardingexternaltables？（）
单项选择题 Consider the following statement： SQL> EXECUTE DBMS_STATS.GATHER_SHEMA_STATS （- 2> ownname => ‘OE’， - 3> estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE， - 4> method opt => ‘for all columns size AUTO’）； What is the effect of ‘for all columns size AUTO’ of the METHOD_OPT option？（）
多项选择题 Examine the list of variables and their data types： AME DATA Type TS， TS1 TIMESTAMP TSZ TIMESTAMP WITH TIME ZONE TLZ TIMESTAMP WITH LOCAL TIME ZONE IYM INTERVAL YEAR TO MONTH IDS， IDSI INTERVAL YEAR To SECOND Which three expressions using the new data and time data types are valid？（）