Matching inconsistent color names
From the sample of records in the parking_violation table, it is clear that the vehicle_color values are not consistent. For example, 'GRY', 'GRAY', and 'GREY' are all used to describe a gray vehicle. In order to consistently represent this color, it is beneficial to use a single value. Fortunately, the DIFFERENCE() function can be used to accomplish this goal.
In this exercise, you will use the DIFFERENCE() function to return records that contain a vehicle_color value that closely matches the string 'GRAY'. The fuzzystrmatch module has already been enabled for you.
Deze oefening maakt deel uit van de cursus
Cleaning Data in PostgreSQL Databases
Oefeninstructies
- Use the
DIFFERENCE()function to findparking_violationrecords having avehicle_colorwith a Soundex code that matches the Soundex code for'GRAY'. Recall that theDIFFERENCE()function accepts string values (not Soundex codes) as parameter arguments.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
SELECT
summons_number,
vehicle_color
FROM
parking_violation
WHERE
-- Match SOUNDEX codes of vehicle_color and 'GRAY'
___(___, ___) = ___;