sql - Insert distinct entries from column x of Table A and column y of Table B into two columns in Table C -


i trying insert distinct combination of flowmeter column of table a , recordtime column of table b table c ensuring no such combination selected.
query should avoid inserting select query output table c if combination found in table c using where clause.

i have written below script seems not working. distinct filter filtering distinct entries 2 joined tables:

insert c (meterid,presrectimestamp,presunits,presval) select distinct a.flowmeter,                 b.recordtime,                 substring(b.formattedvalue,                           charindex(' ',b.formattedvalue)+1,                           len(b.formattedvalue)),                 substring(b.formattedvalue, 1, charindex(' ',b.formattedvalue)-1)  b inner join  on  a.id = b.id  not exists (select * c                   c.meterid = a.flowmeter                     , c.presrectimestamp = b.recordtime)

appreciating much.


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