SQL Server是一款强大的数据库管理系统,具有强大的曲线图制作能力。它可以将记录在数据库中的数据进行可视化并生成各种曲线图,让我们可以更好地展示精彩!下面让笔者根据例子用SQL Server来制作一副曲线图:
第一步:准备数据:在SQL Server中设计一个数据表来保存多条记录,表中有一个柱状图变量和多个曲线图变量。
例如:
建表语句:
create table myTable(
BarVar varchar(15),
CurveVar1 float,
CurveVar2 float,
CurveVar3 float
);
插入数据:
insert into myTable values(‘A’, 10.5, 7.2, 3.2);
insert into myTable values(‘B’, 8.6, 5.6, 2.6);
第二步:绘制曲线图。为绘制曲线图,首先要写一个SQL查询,用来从数据表中提取数据。
SQL查询如下:
SELECT BarVar,
CurveVar1,
CurveVar2,
CurveVar3
FROM myTable
第三步:使用SQL查询获得的数据,在SQL Server中调用曲线图函数形成图形。
如:
SELECT
SeriesName_Test as [SeriesName],
CategoryName_Test as [CategoryName],
Value_Test as [Value],
null as Apple
FROM
(SELECT DISTINCT BarVar AS [CategoryName_Test] , CurveVar1 AS [SeriesName_Test], CurveVar1 AS [Value_Test] FROM myTable) as src
UNION ALL
SELECT
SeriesName_Test as [SeriesName],
CategoryName_Test as [CategoryName],
Value_Test as [Value],
null as Apple
FROM
(SELECT DISTINCT BarVar AS [CategoryName_Test] , CurveVar2 AS [SeriesName_Test], CurveVar2 AS [Value_Test] FROM myTable) as src
UNION ALL
SELECT
SeriesName_Test as [SeriesName],
CategoryName_Test as [CategoryName],
Value_Test as [Value],
null as Apple
FROM
(SELECT DISTINCT BarVar AS [CategoryName_Test] , CurveVar3 AS [SeriesName_Test], CurveVar3 AS [Value_Test] FROM myTable) as src
最后,结合绘图函数把查询的数据可视化,即可形成曲线图。在SQL Server 中,使用Chart Table、chart Function和ChartXML可以实现一些簡單的可视化。
因此,利用SQL Server可轻松实现曲线图的制作,展示精彩!
来源地址:展示精彩:用SQL Server制作曲线图(sqlserver曲线图)
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