In the EasyHL7 Schema Browser you can add search parameters for just about ANY field in ANY segment contained in your HL7 message.

The HL7 Data Table Query Window

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For step 1, select the HL7 Segment / Database Table / Data Field you wish to add to your query.
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Select an operator (=, <>, Is in a List, etc). Based on what you select here proceed to #3.
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Enter your query values in the text box. Note that 'Is Empty' and 'Is Not Empty' do not require you to enter anything.
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Click the 'Add to Search Criteria' button to add what you've entered to your query. Repeat 1-4 as many times as needed
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When you're done, click the 'Ok' button. Click Cancel at any time.
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To see an example SQL statement based on what you've entered, click the 'Show SQL' button.
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