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Exercise

Writing do statements

Commonly when cleaning data, we'll get data that will have bad dates in it. This would cause an exception and halt our SQL statement; however, by using a DO function with an exception handler, our statement will run to completion. Let's see how we can handle that type of exception with the patients table and the created_on column. This will also give us a chance to use a DO style function.

Instructions

100 XP
  • Create a DO function to initiate catching an exception.
  • BEGIN a transaction where you INSERT the row (a1c = 5.8, glucose = 89, fasting = TRUE, and created_on = '37-03-2020 01:15:54') into patients.
  • Add an EXCEPTION handler, that inserts 'bad date' in the detail column of the errors table in case of an error.
  • Specify the 'plpgsql' language .