Click here to Skip to main content
15,443,430 members
Please Sign up or sign in to vote.
0.00/5 (No votes)
See more:
Hi all, I have this code, I want to make reference to some of the created columns to calculate another column.

I want to use the "Cycle" and the "Idle" to display in a separate column where W.[Index] = 'A'.

I have tried using:

CASE WHEN a.[Index] = 'A' THEN Cycle ELSE NULL END AS [CycleTime (s)],
CASE WHEN a.[Index] = 'A' THEN Idle ELSE NULL END AS [IdleTime (s)],

But keeps throwing error, I guess i need to create a temp table which is where am challenged. please assist

What I have tried:

temp As 

(SELECT identityFaceDMC, 
DATEDIFF(SECOND, MIN(WrappingTimeDiam), MAX(WrappingTimeDiam)) AS delay_wrap,
DATEDIFF(SECOND, MIN(PushTimeDiam), MAX(PushTimeDiam)) AS delay_Push				  
FROM orig AS orig_1 GROUP BY identityFaceDMC)	

SELECT TOP (100) a.UNITFaceDMC, a.identityFaceDMC,  a.VariantID, a.[Index],
CASE WHEN a.identityFaceDMC IN (SELECT identityFaceDMC FROM orig GROUP BY identityFaceDMC HAVING  COUNT(*) > 1) THEN 'Double' ELSE 'Single' END AS UNIT_Identifier,
CASE WHEN a.[Index] = 'A' THEN delay_UNIT ELSE NULL END AS [Delay Btw UNIT_MM A&B (s)],
CASE WHEN a.[Index] = 'A' THEN delay_wrap ELSE NULL END AS [Delay Btw UNIT_Wrap 1&2 (s)],
CASE WHEN a.[Index] = 'A' THEN delay_Push ELSE NULL END AS [Delay Btw UNIT_Push A&B (s)], 

CASE WHEN UNITMeanTimeDiam < Time THEN 'True' ELSE 'False' END AS UNITMM_TimeCreated_Invstgtn,
a.WrappingTimeDiam, a.PushTimeDiam, a.DateTimeCompleted,
DATEDIFF(SECOND, a.Time, a.DateTimeCompleted) AS OperationTime,
DATEDIFF(SECOND, LAG(a.Time, 1) OVER (order by a.Time ), a.Time) AS Cycle,
CASE WHEN  DATEDIFF(SECOND, LAG(a.DateTimeCompleted, 2) OVER (order by a.DateTimeCompleted ),  a.Time) < 0 then 0 else DATEDIFF(SECOND, LAG(a.DateTimeCompleted, 2) OVER (order by a.DateTimeCompleted ),  a.Time  ) end AS Idle,

a.GUMMeanTimeDiam, a.UNITMeanDiam,a.UNITMeanIsPass, a.BeadWeight, a.GUMMeanGap, a.GUMMeanDiam, a.GUMMeanGUM, a.GUMMeanIsPass, a.PushSpringback, a.PushDisplacement, a.PushForce,
a.ShiftNumber, a.FinalIsPass 

temp AS b ON a.identityFaceDMC = b.identityFaceDMC
ORDER BY a.identityFaceDMC		 

Updated 26-Oct-21 4:27am
Member 15329613 26-Oct-21 10:16am    
What is the error?
emperortekky 26-Oct-21 10:19am     CRLF
Error Source: .NetSqlClient Data Provider Error Message: Invalid column name 'Cycle' Invalid column name 'Idle'

1 solution

I see where you have 'AS Cycle' which is creating your column. To use that column you could create a temp table but more likely a faster approach would be to wrap a SELECT statement around what you have and make what you have a derived table.

Here's a simple example:
SELECT t.field1, x.dynamic_field  -- this comes from the derived table (nested sql)
FROM table1 t
  -- this is essentially your current sql
  SELECT reference_id AS id, CASE WHEN r.field1 = 'Test' THEN r.field2 ELSE r.field1 END AS dynamic_field
  FROM table2 r
) x ON =
Share this answer

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900