有个编程作业是要模拟一个ATM机，我用vs2013来编写的,sql server版本是2012数据库ATM中已经有表account（card_id , account_owner , account_password , account_sum）怎样利用OleDbCommand来执行语句：update account set account_sum=new_sum where card_id=0....

问答 2016-06-15 来自：开发者社区

关于数据库sql拼写

从2015-01-01开始到2015-01-31,提取每天22点到第二天9点的数据，注意有开始时间（START_TIME）和结束时间（END_TIME）我的sql：怎么才能不提取比如像2015-01-02 14:23:50那个时间点的数据呢？？？麻烦各位大神了

问答 2016-06-15 来自：开发者社区

标准sql语句怎么修改数据库里所有这个字段

所有表，然后这个字段是个字符串，想修改全部，但有的表列名不一定，怎么写sql

问答 2016-06-14 来自：开发者社区

SQL数据库一对多关系如何取出多条数据

现在有两张表,表一是users(用户表)表二是works(作品表)一个用户可以有多个作品,查询后显示结果如下,请问怎么查询?

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