diff --git a/boot-service/src/main/java/com/xwbing/demo/oracle/day02.sql b/boot-service/src/main/java/com/xwbing/demo/oracle/day02.sql
index 912fd02..56581ae 100644
--- a/boot-service/src/main/java/com/xwbing/demo/oracle/day02.sql
+++ b/boot-service/src/main/java/com/xwbing/demo/oracle/day02.sql
@@ -157,8 +157,8 @@ SELECT ENAME,SAL,COMM FROM EMP_XWBING;
 NVL(P1,P2) 若p1为NULL,函数返回p2. 若不为NULL,函数返回p1自身.所以该函数的作用是将NULL替代换为非NULL值
 查看员工总收入?
 SELECT ENAME,nvl(sum(SAL),0) FROM EMP_XWBING;
-//MYSQL
 SELECT ENAME,IFNULL(sum(SAL),0) FROM EMP_XWBING;//MYSQL---------
+
 NVL2(P1,P2,P3) 若p1不为NULL值为p2,p1为NULL值为p3
 查看每个员工的奖金情况?
 SELECT ENAME,SAL,NVL2(BOUNS,'有奖金','无奖金') FROM EMP_XWBING;