备份时:
if exists (select * from sys.backup_devices where name='TEST_Data') if exists (select * from sys.backup_dev
if exists (select * from sys.backup_devices where name='TEST_Data') if exists (select * from sys.backup_dev
阅读背景：
SQL2005 备份+日志备份,还原时却出错了,不知为什么?
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