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/**
 * Copyright (c) 2009-2015, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package org.jooq;

import static org.jooq.SQLDialect.POSTGRES;

import java.util.Collection;

/**
 * This type is used for the {@link Select}'s DSL API when selecting generic
 * {@link Record} types.
 * 
 * Example: 
 * -- get all authors' first and last names, and the number
 * -- of books they've written in German, if they have written
 * -- more than five books in German in the last three years
 * -- (from 2011), and sort those authors by last names
 * -- limiting results to the second and third row
 *
 *   SELECT T_AUTHOR.FIRST_NAME, T_AUTHOR.LAST_NAME, COUNT(*)
 *     FROM T_AUTHOR
 *     JOIN T_BOOK ON T_AUTHOR.ID = T_BOOK.AUTHOR_ID
 *    WHERE T_BOOK.LANGUAGE = 'DE'
 *      AND T_BOOK.PUBLISHED > '2008-01-01'
 * GROUP BY T_AUTHOR.FIRST_NAME, T_AUTHOR.LAST_NAME
 *   HAVING COUNT(*) > 5
 * ORDER BY T_AUTHOR.LAST_NAME ASC NULLS FIRST
 *    LIMIT 2
 *   OFFSET 1
 *      FOR UPDATE
 *       OF FIRST_NAME, LAST_NAME
 *       NO WAIT
 * 
 Its equivalent in jOOQ  * create.select(TAuthor.FIRST_NAME, TAuthor.LAST_NAME, create.count())
 *       .from(T_AUTHOR)
 *       .join(T_BOOK).on(TBook.AUTHOR_ID.equal(TAuthor.ID))
 *       .where(TBook.LANGUAGE.equal("DE"))
 *       .and(TBook.PUBLISHED.greaterThan(parseDate('2008-01-01')))
 *       .groupBy(TAuthor.FIRST_NAME, TAuthor.LAST_NAME)
 *       .having(create.count().greaterThan(5))
 *       .orderBy(TAuthor.LAST_NAME.asc().nullsFirst())
 *       .limit(2)
 *       .offset(1)
 *       .forUpdate()
 *       .of(TAuthor.FIRST_NAME, TAuthor.LAST_NAME)
 *       .noWait();
 *  Refer to the manual for more details
 *
 * @author Lukas Eder
 */
public interface SelectDistinctOnStep extends SelectIntoStep {

    /**
     * Add the PostgreSQL-specific ON(...) clause to a
     * SELECT DISTINCT ON (...) statement.
     * 
     * This implicitly enforces the DISTINCT clause, no matter if
     * it is added explicitly via the jOOQ API.
     */
    @Support({ POSTGRES })
    SelectIntoStep on(SelectField... fields);

    /**
     * Add the PostgreSQL-specific ON(...) clause to a
     * SELECT DISTINCT ON (...) statement.
     * 
     * This implicitly enforces the DISTINCT clause, no matter if
     * it is added explicitly via the jOOQ API.
     */
    @Support({ POSTGRES })
    SelectIntoStep on(Collection> fields);

    /**
     * Add the PostgreSQL-specific ON(...) clause to a
     * SELECT DISTINCT ON (...) statement.
     */
    @Support({ POSTGRES })
    SelectIntoStep distinctOn(SelectField... fields);

    /**
     * Add the PostgreSQL-specific ON(...) clause to a
     * SELECT DISTINCT ON (...) statement.
     */
    @Support({ POSTGRES })
    SelectIntoStep distinctOn(Collection> fields);
}