MySQL
8.4.3
Source Code Documentation
join_type.h
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#ifndef SQL_JOIN_TYPE_H
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#define SQL_JOIN_TYPE_H
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/* Copyright (c) 2020, 2024, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is designed to work with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have either included with
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the program or referenced in the documentation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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// Used to describe what kind of join an iterator is executing.
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enum class
JoinType
{
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INNER
,
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/// Left outer join.
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OUTER
,
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/// Left antijoin, i.e.:
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/// SELECT projection FROM left_releation WHERE NOT EXISTS
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/// (SELECT 1 FROM right_releation WHERE predicate)
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ANTI
,
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/// Left semijoin, i.e.:
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/// SELECT projection FROM left_releation WHERE EXISTS
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/// (SELECT 1 FROM right_releation WHERE predicate)
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SEMI
,
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FULL_OUTER
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};
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#endif
// SQL_JOIN_TYPE_H
JoinType
JoinType
Definition:
join_type.h:28
JoinType::OUTER
@ OUTER
Left outer join.
JoinType::ANTI
@ ANTI
Left antijoin, i.e.
JoinType::FULL_OUTER
@ FULL_OUTER
JoinType::SEMI
@ SEMI
Left semijoin, i.e.
JoinType::INNER
@ INNER
sql
join_type.h
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