单项选择题
A.Any row inserted or updated through view V1 must meet the condition that col4 > 1000.
B.From now on, any row inserted or updated in table T1 must meet the condition that col4 > 1000, but existing rows in the table are not checked.
C.At view creation, DB2 will check the data in table T1, and if in any row doesn't meet the condition col4 > 1000, the view creation will be rejected.
D.Any row inserted or updated through view V1 must meet the condition that col4 > 1000 and no row in table T1 can be updated such that col4 <= 1000, but new rows in the table can be inserted with col4 <= 1000.
单项选择题 Which of the following are all valid DB2 data types?（）
单项选择题 What type of constraint can be used to ensure that, in any given row in a table, the value of one column never exceeds the value of another column?（）
单项选择题 Which of the following will be a consequence of defining the column IDCOL2 in TABLE2 as a foreign key referencing the primary key (IDCOL1) of TABLE1?（）