【简答题】录音中有一段独白,听独白两遍后,从每小题A 、B 、C 中选出能回答所给 问题的正确答案。 1. Where is Susan Rozgony from? A. America B. Australia C. England 2. Why does Susan like singing? A. It gets her clever. B. It makes her relaxed. C. It g...
【单选题】A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 > 1000 ; When will DB2 access the data from table T1 for view V1?()
A.
When view V1 is created
B.
Each time the REFRESH VIEW v1 statement is executed
C.
Each time an SQL statement is executed against view V1
D.
Only the first time an SQL statement is executed against view V1