Update README.md

README.md

@@ -44,6 +44,9 @@ SHOW PROC '/backends';
 ```
 
 test sql
+
+使用一个副本
+
 ```sql
 create database if not exists testdb;
 drop table if exists testdb.test_table;
@@ -53,7 +56,9 @@ create table if not exists testdb.test_table(
 )
 ENGINE=olap
 UNIQUE KEY(name)
-DISTRIBUTED BY HASH(name);
+DISTRIBUTED BY HASH(name)
+PROPERTIES("replication_num" = "1")
+;
 
 insert into testdb.test_table values ("nick", 1), ("nick2", 3);
 select * from testdb.test_table;
@@ -73,4 +78,4 @@ restart
 docker-compose up -d
 ```
 
-Note: 因为数据会被清除，本项目 only for dev 
+Note: 因为数据会被清除，本项目 only for dev