我试图使用一个选择语句从某个MySQL表中获得除一个以外的所有列。有什么简单的方法吗?
编辑:在这个表格中有53列(不是我的设计)
当前回答
你可以:
SELECT column1, column2, column4 FROM table WHERE whatever
没有得到列3，尽管您可能在寻找一个更一般的解?
其他回答
也许我有一个解决Jan Koritak指出的矛盾的方法
SELECT CONCAT('SELECT ',
( SELECT GROUP_CONCAT(t.col)
FROM
(
SELECT CASE
WHEN COLUMN_NAME = 'eid' THEN NULL
ELSE COLUMN_NAME
END AS col
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'employee' AND TABLE_SCHEMA = 'test'
) t
WHERE t.col IS NOT NULL) ,
' FROM employee' );
表:
SELECT table_name,column_name
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'employee' AND TABLE_SCHEMA = 'test'
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
table_name column_name
employee eid
employee name_eid
employee sal
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
查询结果:
'SELECT name_eid,sal FROM employee'
你可以:
SELECT column1, column2, column4 FROM table WHERE whatever
没有得到列3，尽管您可能在寻找一个更一般的解?
我想添加另一个观点来解决这个问题，特别是如果你有少量的列要删除。
您可以使用像MySQL Workbench这样的DB工具来为您生成选择语句，因此您只需手动删除生成语句的那些列，并将其复制到SQL脚本中。
在MySQL Workbench中，生成它的方法是:
右键单击表->发送到Sql编辑器->选择所有语句。
您可以使用DESCRIBE my_table并使用其结果动态地生成SELECT语句。
我的主要问题是在连接表时获得了许多列。虽然这不是您问题的答案(如何从一个表中选择除某些列之外的所有列)，但我认为值得一提的是，您可以指定表。从特定表中获取所有列，而不是仅指定。
下面是一个很有用的例子:
select users.*, phone.meta_value as phone, zipcode.meta_value as zipcode from users left join user_meta as phone on ( (users.user_id = phone.user_id) AND (phone.meta_key = 'phone') ) left join user_meta as zipcode on ( (users.user_id = zipcode.user_id) AND (zipcode.meta_key = 'zipcode') )
结果是用户表中的所有列，以及从元表中连接的两个附加列。
