常见的数据类型转换函数是？（） A: to_number B: to_date C: to_char D: 以上都不对

转换日期类型为字符串的转换函数是（） A: to_date B: to_datetime C: to_char D: to_number

下面的函数不能进行数据类型转换的是（） A: CONVERT B: TO_NUMBER C: CAST D: LTERIM

创建一条弧线的函数是（ ）。 A: arc(number x, number y, number r, number sAngle, number eAngle, boolean counterclockwise) B: rect(number x, number y, number width, number height) C: arcTo(number x1, number y1, number x2, number y2, number radius) D: fillRect(number x, number y, number width, number height)

使用下列哪个不能将Null值转换为实际值（）。 A: NVL B: NVL2 C: NULLIF D: To_number

According to recording 4.1, which statement is true? （ ）。 A: Number four and number five. B: Number one and number two. C: Number three and number four. D: Number one and number four.

如果Number=3，下列命题为真。If Number = 3, point out the truth and false of the following statements.Int(Number * Number) = Number * Number

如果Number=7，下列命题为真。If Number = 7, point out the truth or false of the following expressions.Sqrt(Number*Number ) == Int(Sqrt(Number*Number))

_____ people were killed and injured in the earthquake, ______ whom reached several million. A: A number of, the number of B: The number of, a number of C: A great deal of, the number of D: A great many, a number of

设WHERE子句中有条件表达式：numberIN(100，200）,该表达式的含义是（）。 A: number =100 AND number =200 B: number >;=100 AND number <;=200 C: number=100 OR number =200 D: number >;100 AND number <;200