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跌水(drop;plunge)
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They all think that the prices of personal computers will soon plunge.A: sink
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要删除mytable表中的myindex索引,可以使用()语句。A、DROP myindexB、DROP mytable.myindexC、DROP INDEX myindexD、DROP INDEX mytable.myindex
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Which two operations can be flashed back using the Flashback technology?()A、DROP USER SMITH;B、DROP TABLE EMPLOYEES;C、DROP TABLESPACE USERS;D、ALTER TABLE SALES_REP DROP PARTITION P1;E、ALTER TABLE EMPLOYEES DROP COLUMN DESIG_ID;
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单选题污水纵断图中产生了很多跌水,怎样标注跌水()A
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