SQL union/join/intersect多个select语句
我有两个select语句。如果在过去60秒内记录了任何电压数据和相关腔室名称,则获取列表;如果在过去5分钟内记录了任何电弧事件数据,则获取列表。我试图将电弧计数数据作为新列附加到电压数据表中。我不知道怎么做 请注意,对于电压数据表中的给定腔室名称,可能有弧计数行,也可能没有弧计数行。如果没有行,我想将弧计数列值设置为零 关于如何实现这一点有什么想法吗 电压数据:SQL union/join/intersect多个select语句,sql,select,join,union,intersect,Sql,Select,Join,Union,Intersect,我有两个select语句。如果在过去60秒内记录了任何电压数据和相关腔室名称,则获取列表;如果在过去5分钟内记录了任何电弧事件数据,则获取列表。我试图将电弧计数数据作为新列附加到电压数据表中。我不知道怎么做 请注意,对于电压数据表中的给定腔室名称,可能有弧计数行,也可能没有弧计数行。如果没有行,我想将弧计数列值设置为零 关于如何实现这一点有什么想法吗 电压数据: SELECT DISTINCT dbo.CoatingChambers.Name, AVG(dbo.CoatingGridVolta
SELECT DISTINCT dbo.CoatingChambers.Name,
AVG(dbo.CoatingGridVoltage_Data.ChanA_DCVolts) AS ChanADC,
AVG(dbo.CoatingGridVoltage_Data.ChanB_DCVolts) AS ChanBDC,
AVG(dbo.CoatingGridVoltage_Data.ChanA_RFVolts) AS ChanARF,
AVG(dbo.CoatingGridVoltage_Data.ChanB_RFVolts) AS ChanBRF FROM
dbo.CoatingGridVoltage_Data LEFT OUTER JOIN dbo.CoatingChambers ON
dbo.CoatingGridVoltage_Data.CoatingChambersID =
dbo.CoatingChambers.CoatingChambersID WHERE
(dbo.CoatingGridVoltage_Data.DT > DATEADD(second, - 60,
SYSUTCDATETIME())) GROUP BY dbo.CoatingChambers.Name
返回
Name | ChanADC | ChanBDC | ChanARF | ChanBRF
-----+-------------------+--------------------+---------------------+------------------
OX2 | 2.9099999666214 | -0.485000004371007 | 0.344801843166351 | 0.49748428662618
S2 | 0.100000001490116 | -0.800000016887983 | 0.00690172302226226 | 0.700591623783112
S3 | 4.25666658083598 | 0.5 | 0.96554297208786 | 0.134956782062848
Name | ArcCount
-----+---------
L1 | 283
L4 | 0
L6 | 1
S2 | 55
弧计数表:
SELECT CoatingChambers.Name,
SUM(ArcCount) as ArcCount
FROM CoatingChambers
LEFT JOIN CoatingArc_Data
ON dbo.[CoatingArc_Data].CoatingChambersID = dbo.CoatingChambers.CoatingChambersID
where EventDT > DATEADD(mi,-5, GETDATE())
Group by Name
返回
Name | ChanADC | ChanBDC | ChanARF | ChanBRF
-----+-------------------+--------------------+---------------------+------------------
OX2 | 2.9099999666214 | -0.485000004371007 | 0.344801843166351 | 0.49748428662618
S2 | 0.100000001490116 | -0.800000016887983 | 0.00690172302226226 | 0.700591623783112
S3 | 4.25666658083598 | 0.5 | 0.96554297208786 | 0.134956782062848
Name | ArcCount
-----+---------
L1 | 283
L4 | 0
L6 | 1
S2 | 55
为了清楚起见,我希望此表添加弧计数列,因为上面有两个表:
Name | ChanADC | ChanBDC | ChanARF | ChanBRF | ArcCount
-----+-------------------+--------------------+---------------------+-------------------+---------
OX2 | 2.9099999666214 | -0.485000004371007 | 0.344801843166351 | 0.49748428662618 | 0
S2 | 0.100000001490116 | -0.800000016887983 | 0.00690172302226226 | 0.700591623783112 | 55
S3 | 4.25666658083598 | 0.5 | 0.96554297208786 | 0.134956782062848 | 0
您可以将select语句视为虚拟表,并将它们连接在一起:
select
x.Name,
x.ChanADC,
x.ChanBDC,
x.ChanARF,
x.ChanBRF,
isnull( y.ArcCount, 0 ) ArcCount
from
(
select distinct
cc.Name,
AVG(cgv.ChanA_DCVolts) AS ChanADC,
AVG(cgv.ChanB_DCVolts) AS ChanBDC,
AVG(cgv.ChanA_RFVolts) AS ChanARF,
AVG(cgv.ChanB_RFVolts) AS ChanBRF
from
dbo.CoatingGridVoltage_Data cgv
left outer join
dbo.CoatingChambers cc
on
cgv.CoatingChambersID = cc.CoatingChambersID
where
cgv.DT > dateadd(second, - 60, sysutcdatetime())
group by
cc.Name
) as x
left outer join
(
select
cc.Name,
sum(ac.ArcCount) as ArcCount
from
dbo.CoatingChambers cc
left outer join
dbo.CoatingArc_Data ac
on
ac.CoatingChambersID = cc.CoatingChambersID
where
EventDT > dateadd(mi,-5, getdate())
group by
Name
) as y
on
x.Name = y.Name
此外,用别名简化您的姓名并格式化查询以提高可读性也是值得的……我无耻地尝试了一下 太棒了,谢谢你的时间。isnull对我来说是新的。当我尝试加入虚拟表时,不知怎的失败了…很高兴能提供帮助:-