当前位置: 首页 > 图文教程 > 数据库 > MSSQL > SQL优化实例：从运行30分钟到运行只要30秒

MSSQL
MSSQL 数据库备份和还原的几种方法 图文教程
GridView自定义分页的四种存储过程
sqlserver 中charindex/patindex/like 的比较
SQL2005 大数据量检索的分页
MSSQL2005 INSERT,UPDATE,DELETE 之OUTPUT子句使用实例
MSSQL 字符段分段更新
SQLServer2005中的SQLCMD工具使用
Sql server2005 优化查询速度50个方法小结
SQL2005 四个排名函数(row_number、rank、dense_rank和ntile)的比较
sql2005 数据同步方法
配置 SQLServer2005 以允许远程连接
安装SQL2005 29506错误码的解决方案
SQL Server 2008的升级和部署问题
SQL Server教程:读取第三方数据库的数据
用Trigger规范insert, update的值

No. « 112 113 114 115 »

技术文章搜索

关键字

MSSQL 中的 SQL优化实例：从运行30分钟到运行只要30秒

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-10-30   浏览: 37 ::
收藏到网摘: n/a

 以下的SQL语句在服务器需要运行长达30分钟才能完成:
SELECT     dbo.ComFlow.ComFlowCode, dbo.ComFlow.ComCode, dbo.ComFlow.CustCode, dbo.ComFlow.DepartCode, dbo.ComFlow.SaleCode,
                      dbo.ComFlow.EmpCode, dbo.ComFlow.Quantity * dbo.Commodity.ConvertRate AS Quantity, CONVERT(datetime, DATENAME(yyyy,
                      dbo.ComFlow.FlowDate) + '-' + DATENAME(mm, dbo.ComFlow.FlowDate) + '-' + DATENAME(dd, dbo.ComFlow.FlowDate)) AS FlowDate,
                      dbo.ComFlow.SalType, dbo.Employee.DepartCode AS DepartIn, dbo.Sale.DepartCode AS DepartOut,
                      dbo.ComFlow.Quantity * dbo.Commodity.TradePrice * dbo.Commodity.Discount / 100 AS Total, dbo.Department.GrpCode AS GrpCodeIn,
                      Department1.GrpCode AS GrpCodeOut
FROM         dbo.ComFlow INNER JOIN
                      dbo.Customer ON
                dbo.ComFlow.SalType IN (N'促销', N'流向退货', N'多级流向') AND dbo.ComFlow.CustCode = dbo.Customer.CustCode
                Or ComFlow_1.SalType IN (N'自然流向', N'自然流向退货') AND ComFlow_1.OutCustCode = Customer_1.CustCode
            INNER JOIN
                      dbo.CustomerRelation ON dbo.ComFlow.ComCode = dbo.CustomerRelation.ComCode AND
                      dbo.CustomerRelation.CustCode = dbo.Customer.CustCode INNER JOIN
                      dbo.Employee ON dbo.CustomerRelation.EmpCode = dbo.Employee.EmpCode INNER JOIN
                      dbo.Sale ON dbo.ComFlow.SaleCode = dbo.Sale.SaleCode INNER JOIN
                      dbo.Department ON dbo.Department.DepartCode = dbo.Employee.DepartCode INNER JOIN
                      dbo.Department AS Department1 ON Department1.DepartCode = dbo.Sale.DepartCode AND
                      dbo.Department.GrpCode <> Department1.GrpCode INNER JOIN
                      dbo.Commodity ON dbo.ComFlow.ComCode = dbo.Commodity.ComCode
WHERE     (NOT (dbo.ComFlow.SalType = N'流向退货')) OR
                      (NOT (dbo.Customer.Type = N'医药公司'))
虽然说，我们使用这个语句的应用是一个BI应用，实时性要求不高，但是，我觉得没有道理会运行这么久，应该有办法优