MySQL使用Union创建视图报错
mysql> select * from test_main;+----+-------+| id | value |+----+-------+| 1 | ONE || 2 | TWO || 3 | THREE |+----+-------+3 rows in set (0.00 sec)mysql> create table test_main2 select * from test_main;Query OK, 3 rows affected (0.04 sec)Records: 3 Duplicates: 0 Warnings: 0-- 创建视图, sql 语句加了括号, 报错。CREATE VIEW view_test_mainAS(SELECT * FROM test_mainUNION ALLSELECT * FROM test_main2);ERROR 1064 (42000): You have an error in your SQL syntax; check the manual thatcorresponds to your MySQL server version for the right syntax to use near 'UNION ALLSELECT * FROM test_main2)' at line 5-- 创建视图, sql 语句不加括号, 通过。mysql> CREATE VIEW view_test_main -> AS -> SELECT * FROM test_main -> UNION ALL -> SELECT * FROM test_main2;Query OK, 0 rows affected (0.01 sec)
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