mysql duplicate column name 文心快码 当你遇到MySQL中的“duplicate column name”错误时,这通常意味着在创建表、修改表或执行某些SQL操作时,你尝试添加了一个已经存在的列名。下面我将详细解释这个错误的原因、解决方法以及如何避免它。 1. 错误原因 “duplicate column name”错误的原因很简单:你在数据库表中尝试...
SELECTtable1.column_nameASalias_nameFROMyour_table_nameAStable1JOINyour_table_nameAStable2ONtable1.common_column=table2.common_column; 1. 2. 3. 4. 5. 6. 7. 8. 上述查询语句使用了AS关键字来为重复的列名创建了别名。其中,table1和table2是同一个表的别名,column_name是要查询的列名,alias_name...
select class_id from (select * from ta inner join tb using(class_id) where tea_name = '乔治') tc 就会出现Duplicate column name 'org_id'这种错误 原因是sql在合并表重命名第二个同名列实际上还是存成org_id,只是呈现出来不一样。所以方法有几个: 1.对第二个org_id进行人为重命名 2.把org_id...
MySQL throws back the error message: Query 1 ERROR: Duplicate column name 'dept_no' A view also can’t have two columns of the same name. So to fix this, we can use alias: CREATE VIEW order_view AS SELECT customers.id, payment.id AS order_id, total FROM customers INNER JOIN orders...
mysql> SELECT * FROM (SELECT * FROM user A JOIN user B USING (Host,User)) C; ERROR 1060 (42S21): Duplicate column name 'Password' ... //得到信息 //可能是版本问题,我测试没能成功 mysql> SELECT NAME_CONST((SELECT Host FROM user LIMIT 0,1),0); ERROR...
Re: ERROR 1060 (42S21): Duplicate column name while select and join Chad Bourque June 16, 2010 08:00AM Re: ERROR 1060 (42S21): Duplicate column name while select and join Clement Yap June 20, 2010 07:19PM Sorry, you can't reply to this topic. It has been closed. ...
mysql> select * from(select * from test a join test b using(id))c; ERROR 1060 (42S21): Duplicate column name 'name' 几何函数 mysql有些几何函数,例如geometrycollection(),multipoint(),polygon(),multipolygon(),linestring(),multilinestring(),这些函数对参数要求是形如(1 2,3 3,2 2 1)这样...
SELECT column1 AS col1, duplicate_column_name AS col2 FROM your_table_name; 重构数据库:如果重名字段问题严重影响了数据库的性能和可维护性,可以考虑重构整个数据库,重新设计表结构并确保字段名的唯一性。 参考链接 MySQL ALTER TABLE 语句 MySQL SELECT 语句 ...
mysql>select*from(selectNAME_CONST(version(),1),NAME_CONST(version(),1))x; ERROR1060(42S21): Duplicatecolumnname'5.5.53' 利用这个特性加上join函数可以爆列名: mysql>select*from(select*fromusers ajoinusers b)c; ERROR1060(42S21): Duplicatecolumnname'id'mysql>select*from(select*fromusers ajoi...
Re: join not working as subquery error "duplicate column name" laptop alias July 26, 2011 02:58PM Re: join not working as subquery error "duplicate column name" Rick James July 26, 2011 11:03PM Sorry, you can't reply to this topic. It has been closed. ...