Question

We need to stop populating a table with records, and just update 1 row per record repeatedly. There is no need to maintain any history. I’ve worked with this UPDATE statement but can’t get the right syntax to take into account the JOIN as well.

Can anyone help with making this INSERT INTO a simple UPDATE? I will then add IF EXISTS (do the UPDATE) ELSE (do the insert) once I figure out the syntax of the UPDATE statement. I’m using a excellent script by sqlfool.com, but have made several modifications and I hope this is the last one. Thank you !!

Insert Into [testCentral].[ReplMonitor].[dbo].[replMonitor]
(
      monitorDate
    , publicationName
    , publicationDB
    , iteration
    , tracer_id
    , distributor_latency
    , subscriber
    , subscriber_db
    , Loc_ID
    , subscriber_latency
    , overall_latency
)
Select 
      @currentDateTime
    , @publicationToTest
    , @publicationDB
    , iteration
    , tracer_id
    , IsNull(distributor_latency, 0)
    , subscriber
    , subscriber_db
    , b.LOC_ID
    , IsNull(subscriber_latency, 0)
    , IsNull(overall_latency, 
        IsNull(distributor_latency, 0) + IsNull(subscriber_latency, 0))
From @tokenResults AS a
JOIN LotteryRetail.dbo.casino b
ON 1 = 1 ;

Answer 1

I agree with t-clausen.dk, merge will do the insert and the update in one go.

I think you’re looking for something like this for the update statement but it’s hard to tell without knowing what LotteryRetail.dbo.casino and @tokenResults are:

UPDATE [testCentral].[ReplMonitor].[dbo].[replMonitor]
SET monitorDate = @currentDateTime
    ,publicationName = @publicationToTest
    ,publicationDB = @publicationDB
    ,iteration = b.iteration
    ,tracer_id = b.tracer_id
    ,distributor_latency = b.IsNull(distributor_latency, 0)
    ,subscriber = b.subscriber
    ,subscriber_db = b.subscriber_db
    ,Loc_ID = b.b.LOC_ID
    ,subscriber_latency = b.IsNull(subscriber_latency, 0)
    ,overall_latency = b.IsNull(overall_latency, 
    IsNull(distributor_latency, 0) + IsNull(subscriber_latency, 0))
FROM LotteryRetail.dbo.casino b

This will only work correctly if [testCentral].[ReplMonitor].[dbo].[replMonitor] has only one record otherwise you will need to add a WHERE clause to limit the update to only the record you want to change.