Let's say I would like to use SForce Connector to query for all contacts associated with 2 different accounts. Is there a way to do this with a single query?

For example, "AccountID like Amgen OR Pfizer"?

I'm relatively new to the SForce Connector.

What I would like to do is use the connector to add new contacts. I have spreadsheets with contact data from vendor shows, and I would like to add them into SF. This is pretty easy to do with the SForce Connector, but is there a way to check for duplicates first?

To clarify, I would like the SF Connector to first query to find duplicates, then add any that are not already in SF.

I'm relatively new to the SForce Connector.

What I would like to do is use the connector to add new contacts. I have spreadsheets with contact data from vendor shows, and I would like to add them into SF. This is pretty easy to do with the SForce Connector, but is there a way to check for duplicates first?

To clarify, I would like the SF Connector to first query to find duplicates, then add any that are not already in SF.