네이버 snsid - 1개 cust_no 에 두개의 sns_id가 있는경우 에러안나게 처리

src/main/java/com/style24/persistence/mybatis/shop/TscCustomer.xml

@@ -50,7 +50,7 @@
 		     , FN_GET_USER_NM(C.UPD_NO)                   AS UPD_NM
 		     , DATE_FORMAT(C.UPD_DT, '%Y%m%d%H%i%S')      AS UPD_DT
 		     , (
-		        SELECT DATE_FORMAT(REG_DT, '%Y%m%d%H%i%S')
+		        SELECT DATE_FORMAT(MAX(REG_DT), '%Y%m%d%H%i%S')
 		        FROM   TB_CUSTOMER_SNS
 		        WHERE  CUST_NO = C.CUST_NO
 		        AND    SNS_TYPE = 'NV'