access 的多个left join 要加括号
string sql = "select a.orderId,a.UserName,b.CodeValue as Delivery ,a.DeliveryAddress,a.PhoneNum,c.CodeValue as Payment,d.CodeValue as OrderStatus,d.CodeValue as OrderStatusID,a.OrderTime,a.Merchant from (( m_Order a ";
sql += " left join ( select CodeId,CodeValue from M_DefaultValue where TableId='Delivery') as b on a.Delivery =b.CodeId )";
sql += " left join ( select CodeId,CodeValue from M_DefaultValue where TableId='Payment') as c on a.Payment=c.CodeId )";
sql += " left join ( select CodeId,CodeValue from M_DefaultValue where TableId='OrderStatu') as d on a.OrderStatus =d.CodeId ";
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Microsoft Access是一种关系式数据库，关系式数据库由一系列表组成，表又由一系列行和列组成，每一行是一个记录，每一列是一个字段，每个字段有一个字段名，字段名在一个表中不能重复。
表与表之间可以建立关系（或称关联，连接），以便查询相关联的信息。Access数据库以文件形式保存，文件的扩展名MDB。
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从Access数据库导入到SQL
方法一:
在MSsql中要简历ODBC..方法比较笨点..
方法二:
直接从Access升迁到MSsql..
因为Access数据库有设置密码..还真不好搞..搞了好几次都失败了..
利用方法二..一次成功..
用数据库升迁...简单...
建议使用第二种方法导入ACCESS数据库到MSSQL数据库中..省事!!! ......
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