warning：1071 (42000) Specified key was too long;max key length is 1000 bytes

原因是mysql字段长度设置的太长了，从而导致mysql在建立索引时，索引长度超过了mysql默认许可的长度

默认 Innodb 允许长度为 767

MyISAM 允许长度为 1000

官方说明如下：

Prefix support and lengths of prefixes (where supported) are storage engine dependent. For example, a prefix can be up to 767 bytes long for InnoDB tables or 3072 bytes if the innodb_large_prefix option is enabled. For MyISAM tables, the prefix limit is 1000 bytes.

转一份通俗易懂的 [以下内容转自 http://www.jb51.net/article/24499.htm ]

建立索引时，数据库计算key的长度是累加所有Index用到的字段的char长度后再按下面比例乘起来不能超过限定的key长度1000：
latin1 = 1 byte = 1 character
uft8 = 3 byte = 1 character
gbk = 2 byte = 1 character
举例能看得更明白些，以GBK为例：
CREATE UNIQUE INDEX `unique_record` ON reports (`report_name`, `report_client`, `report_city`);
其中report_name varchar(200), report_client varchar(200), report_city varchar(200)
(200 + 200 +200) * 2 = 1200 > 1000，所有就会报1071错误，只要将report_city改为varchar(100)那么索引就能成功建立。
如果表是UTF8字符集，那索引还是建立不了。

转载于:https://www.cnblogs.com/debmzhang/p/4447313.html

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