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基于如下两个关系，其中雇员信息表关系EMP的主键是雇员号部门信息表关系的主键是部门号。若执行下面列出的操作，哪个操作不能成功执行？
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When families gather for Christmas dinner, some will stick to formal traditions dating back to Grandma's generation. Their tables will be set with the good dishes and silver, and the dress code will be Sunday-best.
But in many other homes, this china-and-silver elegance has given way to a stoneware-and-stainless informality, with dresses assuming an equally casual-Friday look. For hosts and guests, the change means greater simplicity and comfort. For makers of fine china in Britain, it spells economic hard times.
Last week Royal Doulton, the largest employer in Stoke-on-Trent, announced that it is eliminating 1,000 jobs--one-fifth of its total workforce. That brings to more than 4,000 the number of positions lost in 18 months in the pottery (陶瓷) region. Wedgwood and other pottery factories made cuts earlier.
Although a strong pound and weak markets in Asia play a role in the downsizing, the layoffs in Stoke have their roots in earthshaking social shifts. A spokesman for Royal Doulton admitted that the company "has been somewhat slow in catching up with the trend" toward casual dining. Families eat together less often, he explained, and more people eat alone, either because they are single or they eat in front of television.
Even dinner parties, if they happen at all, have gone casual. In a time of long work hours and demanding family schedules, busy hosts insist, rightly, that it's better to share a takeout pizza on paper plates in the family room than to wait for the perfect moment or a "real" dinner party. Too often, the perfect moment never comes. Iron a fine-patterned tablecloth？ Forget it. Polish the silver？ Who has time？
Yet the loss of formality has its down side. The fine points of etiquette (礼节) that children might once have learned at the table by observation or instruction from parents and grandparents ("Chew with your mouth closed Keep your elbows off the table") must be picked up elsewhere. Some companies now offer etiquette seminars for employees who may be competent professionally but clueless socially.
The trend toward casual dining has resulted in
避免经营者背离股东人的目标，其最好的解决办法就是尽量使激励成本和监督成本之和最小。()
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