(<SELECT query that produces the data>)AS<alias for the source query>PIVOT(<aggregation function>(<column being aggregated>)FOR<column that contains the values that become column headers>IN(<first pivoted column>,<second pivoted column>, ...<last pivoted column>) )AS<alias for the pivot ...
select sid,sname,sage,ssex,subject,scorefrom(select*from Student_pivot)asspUNPIVOT(scoreforsubjectin([语文],[数学],[英语]))ast unpivot 特别注意那些成绩为空的行记录都没有出现! 本文项目地址: https://github.com/firewang/sql50 (喜欢的话,Star一下) 阅读原文,或者访问该链接可以在线观看(该系列将...
Microsoft SQL Server是一种关系型数据库管理系统(RDBMS),它支持使用Pivot进行多个聚合函数的数据处理和分析。 Pivot是一种数据转换操作,它可以将行数据转换为列数据,使...
The PIVOT function in SQL Server is not used very often in projects I work on, but can be extremely useful for specific kinds of pages, especially when consumed in ASP.NET using GridView objects. Some people struggle with PIVOT on one field, the online documentation should be sufficient for...
aggregate_function 的評估對象為此子群組上的 value_column,且其結果是作為相對應 output_column.的值來傳回。 如果子群組是空的,SQL Server 會為該 output_column 產生null 值。 如果彙總函式是 COUNT,且子群組是空的,就會傳回零 (0)。 注意 UNPIVOT 子句中的資料行識別碼會依照目錄定序。 SQL Database ...
SQL SERVER中 PIVOT和UNPIVOT的用法【分组统计】 USE LocalAppDB GO ---Use aggregate function SELECTC.customerid, city, CASE WHENCOUNT(orderid) = 0THEN'no_orders' WHENCOUNT(orderid) <= 2THEN'upto_two_orders' WHENCOUNT(orderid) > 2THEN'more_than_two_orders'...
针对sql2005 系统提供两个新的关键字 PIVOT 和UNPIVOT可用来作此类操作. 语法规则 <pivot_clause> ::= ( aggregate_function ( value_column ) FOR pivot_column IN ( <column_list> ) ) <unpivot_clause> ::= ( value_column FOR pivot_column IN ( <column_list> ) ) ...
针对此子组上的 aggregate_function 对 value_column 求值,其结果作为相应的 output_column 的值返回。如果该子组为空,SQL Server 将为该 output_column 生成空值。如果聚合函数是 COUNT ,且子组为空,则返回零 (0) 。 接着我们利用我们开头的例子来理解一下这个FROM 子句,很显然我们的col4 对应上面的value_co...
[last pivoted column] AS <column name> FROM (<SELECT query that produces the data>) AS <alias for the source query> PIVOT ( <aggregation function>(<column being aggregated>) FOR [<column that contains the values that will become column headers>] IN ( [first pivoted column], [second ...
Now, inside the brackets of the PIVOT clause, we add the aggregate function we want to use. We want to see the “number of sales in each store location”, and the num_sales field has this number, and we want to SUM these values. So, we use the SUM function. ...