DataBase System CE Anomalies of a Bad Database design emp info emp_id emp_name skill_idski11_name skill_ date skill_lvl 09112 Jones 44 librarian 03-15-99 12 09112 26 PC-admin 06-30-98 10 09112 ones 89 WOrd-Droc 01-15-00 12 12231 Smith 26 PC-admin 0415-99 12231 Smith 39 bookkeeping 07-30-97 576 13597Brown 27 statistIcs 09-15-99 14131Blake 26 PC-admin 05-30-98 14131 Blake 89 word-proc 0930-99 10 Update Anomaly(修改异常) aa table T is subject to an update anomaly when changing a single attribute value for an entity instance or relationship instance represented in the table may require that several rows of t be updated Haichang Gao, Software School, Xidian University 12DataBase System Haichang Gao , Software School , Xidian University 12  Update Anomaly (修改异常)  A table T is subject to an update anomaly when changing a single attribute value for an entity instance or relationship instance represented in the table may require that several rows of T be updated. Anomalies of a Bad Database Design