sql - MySQL select max date or null date -

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I want to select the maximum date or zero but it shows an error message.

Error: SQLCODE = -104, SQLSTATE = 42601, SQLERRMC = IS;, case when MAX (date; conak, driver = 3.64.114)

Original table is 

  Employee code should resign date 001 1/2/2013 001 1/5/2014 001 tap 002 10/10/2000   
  
  EMPLOYEE_CODE RESIGNATION_DATE 001 False 002 10/10/2000   
 This is my query  
  SELECT EMPLOYEE_CODE, in case When MAX (RESIGNATION_DATE IS is NULL) = 0 THEN MAX (RESIGNATION_DATE) by END as the date received from the EMALOMEECOCONTRACT group;   
 Can anyone locate any problem? Thanks   < p> 
 
 
 Can anyone figure out the problem?   
 Condition in:  
  Maximum (RESIGNATION_DATE IS NULL) = 0   
 You have  MAX > as  RESIGNATION_DATE is NULL   
 Your query should be:  
  select emp_code, res_da, select / em, first select zero emp_code * where res_date emp_code select UNION emp_code, MAX ( res_date) by maximum group * / select from maximum non-zero emp_code * / from Table_name where emp_code is not (select emp_code Table_name where res_date IS NULL) group  emp_code Select            Select emp_code, MAX (res_date) / * non-empty emp_code * from / max selection * to / table_name where emp_code is not in (table_name from emp_code where res_date is is null) group emp_code   < / div>

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