Function within the statement call box SQL

I have a procedure with many cases not to validate inside statements that compare the data in a table and fill in a description of the error of the dates. (snip of the size of the code below)

create or replace procedure "PROC_TEMP_UPDATE"
is
begin
update temp_update
set error_desc = 
    CASE
    WHEN (error_desc != 'MATCH')
        THEN 'PCFN/TCN combo not found in destination table.'
    WHEN (error_desc = 'SKIP')
        THEN NULL
    WHEN (ge_ata is null and az_ata is not null)
        THEN 'Enter GE ATA Date before entering AZ ATA Date.'
    WHEN ((ge_ata is not null and az_ata is not null) and ge_ata > az_ata)
        THEN 'GE ATA Date cannot be greater than AZ ATA Date.'
       end proc_temp_update;

Instead of having to enter the bottom 2 when reporting for each date, I created these functions:
(Function 1: check if Date1 is null and Date2 is not.)
Function 2 these two dates are not null, check if Date1 is greater than Date2.)

function Is_D1_NULL
            (Date1  DATE, Date2 DATE)
            return BOOLEAN is

      result     BOOLEAN := FALSE; 
   begin 
      if (Date1 is null and Date2 is not null) then  
         result := TRUE; 
      end if; 
      return (result); 
   end Is_D1_NULL;

You cannot use Boolean in SQL queries.  You must modify your function to return something like Y/N or 1/0 and assess against that.

That said, move the engine of SQL and PL/SQL is, relatively speaking, cheap, so I let just the comparisons as they are in instruction box instead of calling a function.

John

Tags: Database

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