[多选] Which three statements about subqueries are true?（）

A . A single row subquery can retrieve only one column and one row.
B . A single row subquery can retrieve only one row but many columns.
C . A multiple row subquery can retrieve multiple rows and multiple columns.
D . A multiple row subquery can be compared by using the ">" operator.
E . A single row subquery can use the IN operator.
F . A multiple row subquery can use the "=" operator.

在企业的利润分配环节怎样合理节税？变配电所的主接线是指变配电所（）与电力网相联接的方式。 You installed Oracle Database 11g and are performing a manual upgrade of the Oracle9i database. As a part of the upgrade process，you execute the following script： SQL>@utlu111i.sql Which statement about the execution of this script is true？（） It must be executed from the Oracle Database 11g environment.。 It must be executed only after the SYSAUX tablespace has been created.。 It must be executed from the environment of the database that is being upgraded.。 It must be executed only after AUTOEXTEND is set to ON for all existing tablespaces.。 It must be executed from both the Oracle Database 11g and Oracle Database 9i environments.。创业者应具备哪些方面的素质要求？简述病毒的复制过程。 Which three statements about subqueries are true?（）

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[多选] Which three statements about subqueries are true?（）

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