次のスキーマがあります
CREATE TABLE years (
year_id INT NOT NULL AUTO_INCREMENT,
year_name_in_nums int NOT NULL,
year_name_in_text varchar(255) NOT NULL,
PRIMARY KEY (year_id)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE classes (
class_id INT NOT NULL AUTO_INCREMENT,
class_name varchar(255) NOT NULL,
PRIMARY KEY (class_id)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE students (
student_id INT NOT NULL AUTO_INCREMENT,
student_names varchar(255) NOT NULL,
student_telephone_number int NOT NULL,
PRIMARY KEY (student_id)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE terms (
term_id INT NOT NULL AUTO_INCREMENT,
term_name_in_nums int NOT NULL,
term_name_in_text varchar(255) NOT NULL,
term_year int NOT NULL,
PRIMARY KEY (term_id),
FOREIGN KEY (term_year) REFERENCES years(year_id) ON DELETE CASCADE ON UPDATE CASCADE
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE class_students (
cs_id INT NOT NULL AUTO_INCREMENT,
cs_class_student int NOT NULL,
cs_class_id int NOT NULL,
cs_term_id int NOT NULL,
PRIMARY KEY (cs_id),
FOREIGN KEY (cs_class_student) REFERENCES students(student_id) ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (cs_class_id) REFERENCES classes(class_id) ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (cs_term_id) REFERENCES terms(term_id) ON DELETE CASCADE ON UPDATE CASCADE
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
term_name_in_nums期間表と年表year_name_in_numsから表示したい
この方法でデータを取得しました
(select term_name_in_nums,term_year from terms INNER JOIN class_students ON term_id=cs_term_id);
上記から、term_year年 (year_id) を参照する FOREIGN KEY (term_year) です。
私はこれを試しています
(select term_name_in_nums from terms INNER JOIN class_students ON term_id=cs_term_id)
LEFT JOIN
(select term_year from terms INNER JOIN class_students ON term_id=cs_term_id);
これにより、SQL 構文エラーが発生します。これを修正するにはどうすればよいですか?
編集:データ
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-- Server OS: Win32
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/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
-- Dumping data for table algo.classes: ~10 rows (approximately)
/*!40000 ALTER TABLE `classes` DISABLE KEYS */;
INSERT IGNORE INTO `classes` (`class_id`, `class_name`) VALUES
(1, '1'),
(2, '2'),
(3, '3'),
(4, '4'),
(5, '5'),
(6, '6'),
(7, '7'),
(8, '8'),
(9, '9'),
(10, '10');
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-- Dumping data for table algo.class_students: ~16 rows (approximately)
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INSERT IGNORE INTO `class_students` (`cs_id`, `cs_class_student`, `cs_class_id`, `cs_term_id`) VALUES
(1, 1, 1, 1),
(2, 1, 1, 1),
(3, 2, 1, 1),
(4, 3, 1, 1),
(5, 4, 1, 1),
(6, 5, 1, 1),
(7, 6, 1, 1),
(8, 7, 1, 1),
(9, 8, 1, 1),
(10, 9, 1, 1),
(11, 10, 1, 1),
(12, 11, 1, 1),
(13, 12, 1, 1),
(14, 13, 1, 1),
(15, 14, 1, 1),
(16, 15, 1, 1);
/*!40000 ALTER TABLE `class_students` ENABLE KEYS */;
-- Dumping data for table algo.examinations: ~3 rows (approximately)
/*!40000 ALTER TABLE `examinations` DISABLE KEYS */;
INSERT IGNORE INTO `examinations` (`examination_id`, `examination_name`, `examination_term_id`) VALUES
(1, 'start of term', 1),
(2, 'mid term', 1),
(3, 'end of term', 1);
/*!40000 ALTER TABLE `examinations` ENABLE KEYS */;
-- Dumping data for table algo.examination_data: ~0 rows (approximately)
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-- Dumping data for table algo.students: ~20 rows (approximately)
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INSERT IGNORE INTO `students` (`student_id`, `student_names`, `student_telephone_number`) VALUES
(1, 'aa', 123456),
(2, 'bb', 5576899),
(3, '23050359165419520', 788399),
(4, '23050359165419521', 7892020),
(5, '23050359165419522', 33772),
(6, '23050359165419523', 86729),
(7, '23050359165419524', 526890),
(8, '23050359165419525', 444332),
(9, '23050359165419526', 937678),
(10, '23050359165419527', 44),
(11, '23050359165419528', 774),
(12, '23050359165419529', 2147483647),
(13, '23050359165419531', 2147483647),
(14, '23050359165419533', 2147483647),
(15, '23050359165419535', 353657674),
(16, '23050359165419536', 436),
(17, '23050359165419537', 5467),
(18, '23050359165419538', 565788),
(19, '23050359165419539', 548759898),
(20, '23050359165419540', 2443);
/*!40000 ALTER TABLE `students` ENABLE KEYS */;
-- Dumping data for table algo.terms: ~10 rows (approximately)
/*!40000 ALTER TABLE `terms` DISABLE KEYS */;
INSERT IGNORE INTO `terms` (`term_id`, `term_name_in_nums`, `term_name_in_text`, `term_year`) VALUES
(1, 1, 'term one', 1),
(2, 2, 'term two', 2),
(3, 3, 'term three', 3),
(4, 4, 'term four', 4),
(5, 5, 'term five', 5),
(6, 6, 'term six', 6),
(7, 7, 'term seven', 7),
(8, 8, 'term eight', 8),
(9, 9, 'term nine', 9),
(10, 10, 'term ten', 10);
/*!40000 ALTER TABLE `terms` ENABLE KEYS */;
-- Dumping data for table algo.years: ~15 rows (approximately)
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INSERT IGNORE INTO `years` (`year_id`, `year_name_in_nums`, `year_name_in_text`) VALUES
(1, 2000, '2000/2001'),
(2, 2001, '2001/2002'),
(3, 2002, '2002/2003'),
(4, 2003, '2003/2004'),
(5, 2004, '2004/2005'),
(6, 2005, '2005/2006'),
(7, 2006, '2006/2007'),
(8, 2007, '2007/2008'),
(9, 2008, '2008/2009'),
(10, 2009, '2009/2010'),
(11, 2010, '2010/2011'),
(12, 2011, '2011/2012'),
(13, 2012, '2012/2013'),
(14, 2013, '2013/2014'),
(15, 2014, '2014/2015');
/*!40000 ALTER TABLE `years` ENABLE KEYS */;
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