编写程序he. prg,计算s=1+2+…+50。要求使用 DO WHILE 循环结构。 (2) my. prg 中的SQL语句用于查询出位于“北京”的仓库的“城市”字段以及管理这些仓库的职工的所有信息,现在该语句中有3处错误,分别出现在第1行、第2行和第3行,请更正之。
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