A.DB2 will no longer allow updating the value of IDCOL1 in TABLE
B.When inserting a row in TABLE2, the only values that DB2 will allow for IDCOL2 are the existing values of IDCOL
C.When inserting a row in TABLE2, DB2 will only allow foreign values for IDCOL2, that is values which do not exist in IDCOL
D.When a SELECT statement joins TABLE1 with TABLE2, DB2 will automatically add the condition TABLEIDCOL1=TABLE2.IDCOL2 if not specified in the statement.
参考答案：B
