[英]Crosstab Query in SQL Server 2000
I am hoping that someone has attempted this before and I can get some advice before I go any further. 我希望以前有人试过这个,我可以先得到一些建议。
I am looking to produce something similar to a crosstab query in sql-server 2000. 我希望在sql-server 2000中生成类似于交叉表查询的东西。
I have a table structure similar to the following: 我有一个类似于以下的表结构:
Item Item_Parameter Parameter
id item_id id
desc parameter_id desc
value
What I am looking to do is to flatten out the data through a query/stored procedure to make building reports easier. 我要做的是通过查询/存储过程来展平数据,以使构建报告更容易。
The ideal solution would produce results such as: 理想的解决方案将产生如下结果:
Parameter.desc[0] Parameter.desc[1] Parameter.desc[3]...
item.id[0] Item_Parameter.value Item_Parameter.value Item_Parameter.value
item.id[1] Item_Parameter.value Item_Parameter.value Item_Parameter.value
If you're sure there's at most one value for each parameter-item combination, you can use a simple group by
: 如果您确定每个参数项组合最多只有一个值,则可以使用一个简单的
group by
:
select item_id
, max(case when parameter_id = 1 then value) Par1
, max(case when parameter_id = 2 then value) Par2
, max(case when parameter_id = 3 then value) Par3
from item_paramenter
group by
item_id
You can use min
or avg
instead of max
: it shoulnd't matter because there's only one value for each parameter per item_id, 您可以使用
min
或avg
而不是max
:它无关紧要,因为每个item_id的每个参数只有一个值,
Without dynamic SQL, there is no way to return column names based on the description in the parameter table. 如果没有动态SQL,则无法根据参数表中的描述返回列名。
I ended up using a stored procedure ( http://www.sqlteam.com/article/dynamic-cross-tabs-pivot-tables ) to create a sql statement dynamically. 我最终使用存储过程( http://www.sqlteam.com/article/dynamic-cross-tabs-pivot-tables )动态创建一个sql语句。
Thanks Dan and Andomar 谢谢Dan和Andomar
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