Dynamic SQL Field Type

Dynamic SQL Field Type• Create using the Online Designer or Data Dictionary• Populates a drop-down list of choices by querying the REDCap tables using SELECT

queries only. • The database table being queried must exist in the same MySQL database as the

REDCap tables.• ONLY REDCap Super Users may add/modify this field type.• Advantage of this field type is that it allows you to populate a drop-down from a

dynamic source (i.e. a database table) rather than a static • When constructing the query itself, only 1 or 2 fields may be used in the query.

– If only one field exists in the SQL statement, the values retrieved from the query will serve as both the values AND the displayed text for the drop-down that is populated.

– If two fields are queried, the first field serves as the unseen values of the drop-down list while the second field gets displayed as the visible text inside the drop-down as seen by the user.

Example 1

Queries Project (ID #1264) for the contents of the Provider field and creates a dropdown list in the current project.

SELECT record, value FROM redcap_data WHERE project_id = 1264

AND field_name = ‘faculty’ ORDER BY value;

Example 2

Queries Project (ID=1264) and concatenates Record ID, faculty name and credentials) to create a drop down list in the current project:

SELECT a.record, CONCAT_WS(' | ',

max(if(a.field_name = 'record_id', a.value,NULL)), max(if(a.field_name = ‘faculty', a.value, NULL)), max(if(a.field_name = ‘credentials', a.value, NULL)))

as value FROM redcap_data a WHERE a.project_id=1264 ORDER BY a.record;