我是SQL的新手,我正在研究DB2,我需要得到过去5年中id和x的总和。
以下是到目前为止我已经实现的查询,但是,我只需要获得最后5个yaers,这将获得我多年来的数据。我试图为sql语句添加前5,它似乎不起作用,它显示一些错误。如何修改此查询以仅获取最近5年的数据?
select (sum(X) + sum(Y)) as tot,some_date
from table where fkid = 1
group by year order by year desc;
以下是我期待的数据格式。
总年份
552,074.78 2012-01-01
466,283.62 2011-01-01
640,813.37 2010-01-01
721,182.28 2009-01-01
719,676.05 2008-01-01
我得到的错误如下
错误:DB2 SQL错误:SQLCODE = -104,SQLSTATE = 42601,SQLERRMC = 5; VALUE(CONCAT || / - + FROM INTO *,\ AS。年,DRIVER = 3.58.81 SQLState:42601 ErrorCode:-104 错误:DB2 SQL错误:SQLCODE = -514,SQLSTATE = 26501,SQLERRMC = SQL_CURLH200C1,DRIVER = 3.58.81 SQLState:26501 ErrorCode:-514
编辑:列中包含日期类型,列名称不是年份,例如我将其修改为some_year。
答案 0 :(得分:2)
您的查询问题很简单(假设这是唯一的问题)。 year
是保留字,因此请用双引号括起来:
select (sum(X) + sum(Y)) as tot, "year"
from table
where fkid = 1
group by "year"
order by "year" desc;
过去五年是另一回事。根据{{1}}列,您可以执行以下操作:
year
或者您实际上可能有另一列具有可以使用的日期时间,而不是select (sum(X) + sum(Y)) as tot, "year"
from table
where fkid = 1 and year >= year(current timestamp) - 5
group by "year"
order by "year" desc;
。
编辑:
如果您有一个名为"year"
的列是日期,您可以使用:
dt
如果您只希望一行包含总和,请忽略select (sum(X) + sum(Y)) as tot, year(dt) as "year"
from table
where fkid = 1 and dt >= CURRENT DATE - 5 years and dt <= CURRENT DATE
group by year(dt)
order by year(dt) desc;
子句。