diff --git a/docs/en_US/edgex/edgex_rule_engine_command.md b/docs/en_US/edgex/edgex_rule_engine_command.md
index 789558d5c1..650272a63e 100644
--- a/docs/en_US/edgex/edgex_rule_engine_command.md
+++ b/docs/en_US/edgex/edgex_rule_engine_command.md
@@ -255,7 +255,7 @@ curl -X POST \
   -H 'Content-Type: application/json' \
   -d '{
   "id": "rule2",
-  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE int8 != nil GROUP BY TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
+  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE isNull(int8) = false GROUP BY TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
   "actions": [
     {
       "rest": {
@@ -278,7 +278,7 @@ The procedure is the same as the previous step. Use the following configuration
 
 ```shell
 {
-  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE int8 != nil GROUP BY  TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
+  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE isNull(int8) = false GROUP BY  TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
   "actions": [
     {
       "mqtt": {
diff --git a/docs/zh_CN/edgex/edgex_rule_engine_command.md b/docs/zh_CN/edgex/edgex_rule_engine_command.md
index 2573ff86b4..064fded5c3 100644
--- a/docs/zh_CN/edgex/edgex_rule_engine_command.md
+++ b/docs/zh_CN/edgex/edgex_rule_engine_command.md
@@ -218,7 +218,7 @@ curl -X POST \
   -H 'Content-Type: application/json' \
   -d '{
   "id": "rule2",
-  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE int8 != nil GROUP BY  TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
+  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE isNull(int8) = false GROUP BY  TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
   "actions": [
     {
       "rest": {
@@ -241,7 +241,7 @@ curl -X POST \
 
 ```shell
 {
-  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE int8 != nil GROUP BY  TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
+  "sql": "SELECT avg(int8) AS avg_int8 FROM demo WHERE isNull(int8) = false GROUP BY  TUMBLINGWINDOW(ss, 20) HAVING avg(int8) > 0",
   "actions": [
     {
       "mqtt": {