just to complete the rrjegan17's post
for point number one you can achieve it by putting the dataset and passing it as xml to database
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Compare dataset data to database table data
I have some data in a dataset. I need to check each row if it is already present in a database table having millions of records. What is the most efficient way of doing this?
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Answers
>> But I have a limitation of only running 'Select' statements on the database(cannot change the state of the database).
Then you have to loop through the records in your application.
No other go..
>> I need to check each row if it is already present in a database table having millions of records.
Since you mentioned your above limitation, can you explain your requirement in detail as I am not sure what you are trying to achieve..
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by: rrjegan17Posted on 2009-11-03 at 22:18:04ID: 25736861
>> I need to check each row if it is already present in a database table having millions of records.
Since you have Millions of records,
1. Insert records from your dataset into a temp table.
2. Run a query to find records that are present only in your temp table compared to the actual table like
select temp.pk
from temp left outer join ur_table on temp.pk = ur_table.pk
WHERE ur_table.pk is null
3. Above query would list records that are present newly in your temp table ( dataset)..
4. Insert records above only.
5. Update rest of the records if required.