prasadau2006 (1/28/2015)
Hello Friends,I need help with the following query, this query is taking more than 20mins to complete. I'm using a left join to
pull the data.
Query:
Insert into dbo.SecondTable
Select b.* From dbo.FirstTable a Left Join dbo.SecondTable b on a.Id=b.Id where b.Id is null
it inserts approximately 1.5million records.
Thanks for your help in advance
The SELECT query will return NULLs in every column – it is selecting all the rows in 'a' which have no matching row in 'b' and returning only the (NULL) values from table 'b'.
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