单项选择题

Python支持for循环和while循环，两种执行基本一样，都不需要额外用代码在循环体中修改循环变量。
A、正确
B、错误

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单项选择题
以下关于PL／SQL块的说法正确的是（）
A.匿名块(Anonymous
B.子程序(Subprograms)是被命名的PL/SQL块,存储在数据库服务器端
C.匿名块比子程序执行效率要高
D.无论是匿名块还是子程序,其实都是PL/SQL块,在定义变量前都要以DECLARE关键字开始
E.过程(procedure)无返回值,而函数(function)是有返回值的
单项选择题
You created an encrypted tablespace:You then closed the encryption wallet because you were advised that this is securE.Later in the day, you attempt to create the EMPLOYEES table in the SECURESPACE tablespace with the SALT option on the EMPLOYEE column.Which is true about the result?（）A.It creates the table successfully but does not encrypt any inserted data in the EMPNAME column because the wallet must be opened to encrypt columns with SALT.B.It generates an error when creating the table because the wallet is closeD.C.It creates the table successfully, and encrypts any inserted data in the EMPNAME column because the wallet needs to be open only for tablespace creation.D.It generates error when creating the table, because the salt option cannot be used with encrypted tablespaces.
A.Later
B.Which
C.
D.
E.
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