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在两个字段中的组合查询,什么方式查询最快?(SQL Server2000),定义索引的种类的区别呢?(30万条记录中),字段类型用Char、VarChar或Int哪一种更好?

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请问在两个字段中的组合查询,什么方式查询最快?(SQL Server2000),定义索引的种类的区别呢?(30万条记录中),字段类型用Char、VarChar或Int哪一种更好? 在VC中用ODBC连接用什么方法好?
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当然字段用Int类型最快,这两个字段最好有索引
要速度就不要用ODBC,通过ADO直接和SQL SERVER连接
两个字段中怎么设计索引?
两个字段中怎么设计索引?
index on field1+field2
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