问题
I want to compare the current row with a value in the next row. SQL has LEAD
and LAG
functions to get the next and previous values but I can not use them because I am using SQL Server 2008.
So how do I get this?
I have table with output
+----+-------+-----------+-------------------------+
| Id | ActId | StatusId | MinStartTime |
+----+-------+-----------+-------------------------+
| 1 | 42 | 1 | 2014-02-14 11:17:21.203 |
| 2 | 42 | 1 | 2014-02-14 11:50:19.367 |
| 3 | 42 | 1 | 2014-02-14 11:50:19.380 |
| 4 | 42 | 6 | 2014-02-17 05:25:57.280 |
| 5 | 42 | 6 | 2014-02-19 06:09:33.150 |
| 6 | 42 | 1 | 2014-02-19 06:11:24.393 |
| 7 | 42 | 6 | 2014-02-19 06:11:24.410 |
| 8 | 42 | 8 | 2014-02-19 06:44:47.070 |
+----+-------+-----------+-------------------------+
What I want to do is if the current row status is 1 and the next row status is 6 and both times are the same (up to minutes) then I want to get the row where the status is 1.
Eg: Id 6 row has status 1 and Id 7 row has status 6 but both times are the same ie. 2014-02-19 06:11
So I want to get this row or id for status 1 ie. id 6
回答1:
In your case, the id
s appear to be numeric, you can just do a self-join:
select t.*
from table t join
table tnext
on t.id = tnext.id - 1 and
t.StatusId = 1 and
tnext.StatusId = 6 and
datediff(second, t.MinStartTime, tnext.MinStartTime) < 60;
This isn't quite the same minute. It is within 60 seconds. Do you actually need the same calendar time minute? If so, you can do:
select t.*
from table t join
table tnext
on t.id = tnext.id - 1 and
t.StatusId = 1 and
tnext.StatusId = 6 and
datediff(second, t.MinStartTime, tnext.MinStartTime) < 60 and
datepart(minute, t.MinStartTime) = datepart(minute, tnext.MinStartTime);
回答2:
Just posting a more complex join using two different tables created with Gordon's foundation. Excuse the specific object names, but you'll get the gist. Gets the percentage change in samples from one to the next.
SELECT fm0.SAMPLE curFMSample , fm1.SAMPLE nextFMSample , fm0.TEMPERATURE curFMTemp , fm1.TEMPERATURE nextFMTemp , ABS(CAST((fm0.Temperature - fm1.Temperature) AS DECIMAL(4, 0)) / CAST(fm0.TEMPERATURE AS DECIMAL(4, 0))) AS fmTempChange , fm0.GAUGE curFMGauge , fm1.GAUGE nextFMGauge , ABS(CAST((fm0.GAUGE - fm1.GAUGE) AS DECIMAL(4, 4)) / CAST(fm0.GAUGE AS DECIMAL(4, 4))) AS fmGaugeChange , fm0.WIDTH curFMWidth , fm1.WIDTH nextFMWidth , ABS(CAST((fm0.Width - fm1.Width) AS DECIMAL(4, 2)) / CAST(fm0.Width AS DECIMAL(4, 2))) AS fmWidthChange , cl0.TEMPERATURE curClrTemp , cl1.TEMPERATURE nextClrTemp , ABS(CAST((cl0.Temperature - cl1.Temperature) AS DECIMAL(4, 0)) / CAST(cl0.TEMPERATURE AS DECIMAL(4, 0))) AS clrTempChange FROM dbo.COIL_FINISHING_MILL_EXIT_STR02 fm0 INNER JOIN dbo.COIL_FINISHING_MILL_EXIT_STR02 fm1 ON (fm0.SAMPLE = fm1.SAMPLE - 1 AND fm1.coil = fm0.coil) INNER JOIN dbo.COIL_COILER_STR02 cl0 ON fm0.coil = cl0.coil AND fm0.SAMPLE = cl0.SAMPLE INNER JOIN dbo.COIL_COILER_STR02 cl1 ON (cl0.SAMPLE = cl1.SAMPLE - 1 AND cl1.coil = cl0.coil) WHERE fm0.coil = 2015515872
回答3:
Well, I would suggest a very simple solution if you do not have a sequential row id but a different step (if some records were deleted for example..):
declare @t table(id int, obj_name varchar(5))
insert @t select 1,'a'
insert @t select 5,'b'
insert @t select 22,'c'
insert @t select 543,'d'
---------------------------------
select *from @t
Example Source Table @t:
---------------------------------
id obj_name
1 a
5 b
22 c
543 d
---------------------------------
Select with self join
select obj_name_prev=tt.obj_name, obj_name_next=min(t.obj_name)
from @t t
join @t tt on tt.id < t.id
group by tt.obj_name
Result:
---------------------------------
obj_name_prev obj_name_next
a b
b c
c d
---------------------------------
来源:https://stackoverflow.com/questions/22188514/alternate-of-lead-lag-function-in-sql-server-2008