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The AND operator returns a record if both the first condition and the second conditions are true. The query tool uses the AND operator when concepts are listed in different Group panels.
Example:
WHAT: Return only those patients who have Acute Myocardial Infarction AND Angina Pectoris.
HOW: In the query tool add the concept Acute Myocardial Infarction to Group 1 and then add the concept Angina Pectoris to Group 2.
RESULT: The The population is limited by requiring the patients fulfill both requirements.
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OR Operator
The OR operator returns a record if either the first condition or the second conditions are true.
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