错误代码:1060.列名重复

Question

我一直在收到错误代码:1060.:

• 重复的列名称'NULL'
• 重复列名称'2016-08-04 01:25:06'
• 重复列名称'john'

但是,我需要插入一些具有相同值的字段,但SQL拒绝并显示上述错误.错误可能是sql无法选择相同的列名,在这种情况下是否有其他编写代码的方法？以下是我目前的代码

INSERT INTO test.testTable SELECT * 
FROM (SELECT NULL, 'hello', 'john', '2016-08-04 01:25:06', 'john'
, '2016-08-04 01:25:06', NULL, NULL) AS tmp
WHERE NOT EXISTS (SELECT * FROM test.testTable WHERE message= 'hello' AND created_by = 'john') LIMIT 1

我的专栏:

• (id,message,created_by,created_date,updated_by,updated_date,deleted_by,deleted_date)

请帮助,谢谢.

Answer 1

您的重复列名称来自您的子查询.您选择null,john和2016-08-04 01:25:06多次.使用名称/别名提供您选择的列:

INSERT INTO test.testTable 
SELECT * 
FROM (SELECT NULL as col1, 'hello' as col2, 
       'john' as col3, '2016-08-04 01:25:06' as col4, 
       'john' as col5, '2016-08-04 01:25:06' as col6, 
       NULL as col7, NULL as col8) AS tmp
WHERE NOT EXISTS (SELECT * 
                  FROM test.testTable 
                  WHERE message= 'hello' AND created_by = 'john')
LIMIT 1

不确定limit 1在这里是否有用,您只选择可能插入的单行.