第 12 题 (多选题)： Which two statements are true regarding indexes.

A. An update to a table can result in updates to any or all of the table's indexes . B. An update to a table can result in no updates to any of the table's indexes. C. A non-unique index can be altered to be unique. D. A table belonging to one user cannot have an index that belongs to a different user . E. The RECYCLE BIN never contains indexes 显示答案