sql server - How to find Match Records in SQL and if found then update -

i looking way loop through sql table , compare table , if 2 of columns values match update record in 1 table.

i have 2 tables hplcdata , deschedule, deschedule has future records hplcdata table have. wanting sql query in hplcdata matching records in deschedule table , if there update record in deschedule data hplcdata , mark in done. match defined having same batchid , sampleage.

how can acomplish this?

hplc data  batchid | sampleage | ethanol | glucose 7254       20          7.8       4.5  deschedule  batchid | sampleage | ethanol | glucose | samplecompleted 7254       20          null       null      null 7254       30          null       null      null   

so of right have trigger need way reconcile data if trigger misses record , running query windows job.

this query use trigger:

alter trigger [dbo].[trigger_hplc_update_details_deschedule] on [dbo].[hplcdata]      after insert   begin     declare @batchid int, @ethanol varchar(10), @glucose varchar(10), @sampleage varchar(10);     select @batchid = bd.[batchid],@ethanol = [ethanol], @glucose= [dp1glucose], @sampleage = bd.sampleage       inserted bd     update [dbo].[deschedule] set [ethanol] = @ethanol, [glucose] = @glucose, [samplecompleted] = 1      [batchid] = @batchid , [sampleage] = @sampleage end 

you can use merge statement.

something along:

merge dbo.deschedule target using (dbo.hplcdata) source on source.batchid = target.batchid , source.sampleage = target.sampleage when matched update ethanol = source.ethanol, glucose = source.glucose, samplecompleted = 1;