How to skip or auto-approve when I use query-database function in BPM approval rule

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Hi,

We plan to use query-database function in BPM SSP approval rule.
And we have confirmed query-database can cover most of approval pattern in our business needs.

But we don't have any idea about auto-approval situation.
For example, only when requestor buy specific category item, we want approval rule to skip or auto-approve.

Please tell me how to define skip or auto-approval setting when use query-database function.