org.jooq.impl.CombineOperator Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2016, 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
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* http://www.apache.org/licenses/LICENSE-2.0
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* limitations under the License.
*
* Other licenses:
* -----------------------------------------------------------------------------
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* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
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* For more information, please visit: http://www.jooq.org/licenses
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package org.jooq.impl;
import org.jooq.SQLDialect;
import org.jooq.Select;
/**
* A combine operator is used to combine result sets of two arbitrary
* {@link Select} queries.
*
* @author Lukas Eder
*/
enum CombineOperator {
/**
* Unite the sets of rows produced by the two {@link Select}'s (disallowing
* duplicate records).
*/
UNION("union"),
/**
* Unite the bags of rows produced by the two {@link Select}'s (allowing
* duplicate records).
*/
UNION_ALL("union all"),
/**
* Remove all rows in the set of rows produced by the second {@link Select}
* from the set of rows produced by the first {@link Select} (disallowing
* duplicate records).
*/
EXCEPT("except"),
/**
* Remove all rows in the bag of rows produced by the second {@link Select}
* from the bag of rows produced by the first {@link Select} (allowing
* duplicate records).
*/
EXCEPT_ALL("except all"),
/**
* Retain all rows in the sets of rows produced by both {@link Select}'s
* (disallowing duplicate records).
*/
INTERSECT("intersect"),
/**
* Retain all rows in the bags of rows produced by both {@link Select}'s
* (allowing duplicate records).
*/
INTERSECT_ALL("intersect all");
private final String sql;
private CombineOperator(String sql) {
this.sql = sql;
}
public String toSQL(SQLDialect dialect) {
return sql;
}
}