seqn source g
62191 coffee 1
62191 others 13
62191 tea 27
62192 others 19
62193 others 0
62194 others 0
62195 others 0
62196 others 1
62197 others 55
62198 others 33
62199 coffee 192
62199 others 0
62199 tea 0
62200 others 62
62202 coffee 137
62202 others 1
62205 others 82
62206 coffee 392
62206 others 32
62207 others 0
62208 coffee 51
62208 others 52
62209 others 3
如上的数据库中,每个人(seqn)的食物来源(source)有三种(coffee, tea, others)和对应的克数(g),现在我想每一行只有一个人(seqn),变量名增加为sourcecoffee, sourcetea和souorceothers。请问该如何操作?谢谢!


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