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/**
 * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * This work is dual-licensed
 * - under the Apache Software License 2.0 (the "ASL")
 * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
 * =============================================================================
 * You may choose which license applies to you:
 *
 * - If you're using this work with Open Source databases, you may choose
 *   either ASL or jOOQ License.
 * - If you're using this work with at least one commercial database, you must
 *   choose jOOQ License
 *
 * For more information, please visit http://www.jooq.org/licenses
 *
 * Apache Software License 2.0:
 * -----------------------------------------------------------------------------
 * 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.
 *
 * jOOQ License and Maintenance Agreement:
 * -----------------------------------------------------------------------------
 * Data Geekery grants the Customer the non-exclusive, timely limited and
 * non-transferable license to install and use the Software under the terms of
 * the jOOQ License and Maintenance Agreement.
 *
 * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
 * and Maintenance Agreement for more details: http://www.jooq.org/licensing
 */
package org.jooq;

import static org.jooq.SQLDialect.CUBRID;
// ...
// ...
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
// ...

/**
 * This type is used for the window function DSL API.
 * 
 * Example: 
 * field.firstValue()
 *      .ignoreNulls()
 *      .over()
 *      .partitionBy(AUTHOR_ID)
 *      .orderBy(PUBLISHED_IN.asc())
 *      .rowsBetweenUnboundedPreceding()
 *      .andUnboundedFollowing()
 * 
 *
 * @param  The function return type
 * @author Lukas Eder
 */
public interface WindowPartitionByStep extends WindowOrderByStep {

    /**
     * Add a PARTITION BY clause to the window functions.
     */
    @Support({ CUBRID, POSTGRES })
    WindowOrderByStep partitionBy(Field... fields);

    /**
     * Add a PARTITION BY 1 clause to the window functions, where
     * such a clause is required by the syntax of an RDBMS.
     * 
     * This clause is not supported as such in the CUBRID and Sybase dialects.
     * If you use it, jOOQ will simply ignore it.
     */
    @Support({ CUBRID, POSTGRES })
    WindowOrderByStep partitionByOne();

}