SQL 语句动态写法

SQL 语句动态写法 ？在线等
SQL 语句能这样写吗 我要查询的是动态的 可变的

C# code

SqlConnection con = new SqlConnection("server=localhost;database=7daydian;uid=sa;pwd=1234");        string dia = "dianliang";        string sql = "select '"+dia+"' from tongji order by shijian";        SqlCommand com = new SqlCommand(sql, con);

C# code

 string sql = 'select "+dia+" from tongji order by shijian';
[解决办法]
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引用:
dia是字段名？
string sql = "select " + dia + " from tongji order by shijian";
这样写

C# code

string sql = "select distinct  [name] as 板块名称 ,[" + mon + "]as [周一]
,[" + thur + "]as [周2]
,[……

[解决办法]
探讨


dia是字段名？
 string sql = "select " + dia + " from tongji order by shijian";
这样写