1. Dynamic SQL Field Type

2. 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.

3. 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;

4. 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;