SQL新手咨询：如何确定is_satisfied函数中requirement_type_enum与state参数的传入值及配置方式

Hey there! Let's unpack this clearly since you're new to SQL and trying to wrap your head around these two parameters.

First, let's start with the basics: requirement_type_enum and state are columns pulled directly from the all_requirements_driver_documents table in your query. The snippet selects them to feed into the custom is_satisfied() function, so their values come from the raw data stored in that table.

How to find their actual values for the driver #

To see what specific values these columns hold for the driver VDi9jqE2, run this quick query to inspect the raw data:

SELECT DISTINCT requirement_type_enum, state 
FROM all_requirements_driver_documents 
WHERE driver_id = 'VDi9jqE2';

This will show you every unique combination of these two values for that driver. Remove the DISTINCT keyword if you want to see all rows (including duplicates).

What these parameters represent (and their configuration rules) #

• requirement_type_enum: This is almost certainly an enumerated (enum) type, meaning it has a fixed, predefined set of allowed values set when the table was created. Common examples might be things like 'COMMERCIAL_LICENSE', 'MEDICAL_CERTIFICATE', or 'VEHICLE_INSURANCE'—these are the specific document types your system tracks for drivers. To see the full list of allowed values, check the table's schema:

  -- For PostgreSQL
  SELECT unnest(enum_range(NULL::requirement_type_enum));
  
  -- For MySQL
  SHOW COLUMNS FROM all_requirements_driver_documents LIKE 'requirement_type_enum';
  

  The "Type" column in the result will list all valid enum options.

• state: This is likely a geographic state/region code (like 'CA' for California, 'TX' for Texas, or country-specific codes if it's an international system). Valid values here are tied to your system's business rules—for example, which regions require specific driver documents. You can check the table's schema for constraints (like a foreign key linking to a states reference table) or ask your team about the allowed values.

A quick note on the is_satisfied() function #

This custom function uses requirement_type_enum (to know which document requirement we're checking) and state (to account for regional rules) alongside expiration_date to determine if the driver's document meets the system's standards. The values of those two parameters directly affect whether the function returns true or false.

If you still need deeper context, reaching out to the team that built this function or maintains the all_requirements_driver_documents table would be a great next step—they’ll know the exact business logic tied to these fields.

内容的提问来源于stack exchange，提问作者Alwaysblue