PROC SQL实现独热编码更新后结果全为0的问题求助

大家好，我现在尝试用PROC SQL实现独热编码，根据la_education列的单元格值，把la_education_graduatea和la_education_notgraduatea这两个列分别更新为1或0。代码编译的时候没有报错，但运行后结果里这两个列全是0，看起来更新操作根本没生效，想请教下各位大佬问题出在哪里？

我的代码如下：

PROC SQL;
   /* Update the 'la_education_graduatea' column */
   UPDATE DMLIB601.LOAN_APPROVAL_SORTED_DS
   SET la_education_graduatea = 
      CASE 
         WHEN UPCASE(TRIM(la_education)) eq 'GRADUATE' THEN 1
         ELSE 0 
      END
   WHERE la_education IS NOT MISSING AND TRIM(la_education) NE '';

   /* Update the 'la_education_notgraduatea' column */
   UPDATE DMLIB601.LOAN_APPROVAL_SORTED_DS
   SET la_education_notgraduatea = 
      CASE  
         WHEN UPCASE(TRIM(la_education)) eq 'NOT GRADUATE' THEN 1 
         ELSE 0 
      END
   WHERE la_education IS NOT MISSING AND TRIM(la_education) NE '';
QUIT;

备注：内容来源于stack exchange，提问作者Terri . K Woon