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Adding more Groups to a Query

In building up a Query, Folders or subfolders that contains concepts, patient information, etc. can be dragged into one of more of the Group panels in the Query View.  Items in the same Group are evaluated as a Boolean OR operation. Different Groups are evaluated as a Boolean AND operations. The button at the top of each group also allows the exclusion of that group (a Boolean NOT).  A Group can be included or excluded in the query (a Boolean NOT operator).

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In the figure below, a fourth group was added although only 3 Groups are visible at a time.  There are navigation buttons on either side of the New Group button that allow you (from left to right) to move to the first Group, move to the previous Group, New Group, move to the next Group and move to the last Group.

Setting Constraints

Constraints are used to narrow down the search criteria to a particular time frame, number of occurrences or a specific value or range of values. In i2b2, there are several types of constraints that can be defined in the Query Tool view.

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