/*
* Copyright 1999-2017 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.druid.bvt.sql.oracle;
import org.junit.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);
}
}