diff --git a/src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleSubqueryFactoringTest.java b/src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleSubqueryFactoringTest.java
new file mode 100644
index 0000000000..2e33e23151
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleSubqueryFactoringTest.java
@@ -0,0 +1,54 @@
+package com.alibaba.druid.bvt.sql.oracle;
+
+import junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
+import com.alibaba.druid.sql.test.TestUtils;
+
+public class OracleSubqueryFactoringTest extends TestCase {
+
+    public void test_interval() throws Exception {
+        String sql = "WITH dept_costs AS (\n" +
+        		"SELECT department_name, SUM(salary) dept_total\n" +
+        		"FROM employees e, departments d\n" +
+        		"WHERE e.department_id = d.department_id\n" +
+        		"GROUP BY department_name), " +
+        		"avg_cost AS (SELECT SUM(dept_total)/COUNT(*) avg FROM dept_costs)\n" +
+        		"SELECT * FROM dept_costs WHERE dept_total > (SELECT avg FROM avg_cost) ORDER BY department_name;";
+
+        String expected = "WITH\n" +
+        		"\tdept_costs\n" +
+        		"\tAS\n" +
+        		"\t(\n" +
+                "\t\tSELECT department_name, SUM(salary) AS dept_total\n" +
+                "\t\tFROM employees e, departments d\n" +
+                "\t\tWHERE e.department_id = d.department_id\n" +
+                "\t\tGROUP BY department_name\n" +
+                "\t), \n" +
+                "\tavg_cost\n" +
+                "\tAS\n" +
+                "\t(\n" +
+                "\t\tSELECT SUM(dept_total) / COUNT(*) AS avg\n" +
+                "\t\tFROM dept_costs\n" +
+                "\t)\n" +
+                "SELECT *\n" +
+                "FROM dept_costs\n" +
+                "WHERE dept_total > (\n" +
+                "\tSELECT avg\n" +
+                "\tFROM avg_cost\n" +
+                "\t)\n" +
+                "ORDER BY department_name;\n";
+
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        SQLSelectStatement stmt = (SQLSelectStatement) parser.parseStatementList().get(0);
+
+        String text = TestUtils.outputOracle(stmt);
+
+        Assert.assertEquals(expected, text);
+
+        System.out.println(text);
+    }
+
+}