错误代码 [1068] [42000] 是一个 SQL 错误,具体表示“multiple primary key defined”,即“定义了多个主键”。这个错误通常发生在尝试为一个表设置超过一个主键时。 2. 阐述“multiple primary key defined”错误的产生原因 “multiple primary key defined”错误产生的原因是在一个表中尝试定义了多个主键。在 SQL...
#增加主键 alter table my_test add phone_number VARCHAR(30) not null;update my_test set phone_number=123456789;alter table my_test add primary key (phone_number); #[Err] 1068 - Multiple primary key defined 这是因为已经存在主键 (id) 了，需要先删除原来的主键，再设置新的主键 显⽰主键：sh...
添加主键时,出现错误:[Err] 1068 - Multiple primary key defined #增加主键altertablemy_testaddphone_numberVARCHAR(30)notnull;updatemy_testsetphone_number=123456789;altertablemy_testaddprimarykey(phone_number); #[Err] 1068 - Multiple primary key defined 这是因为已经存在主键 (id) 了,需要先删除原来...
106842000ER_MULTIPLE_PRI_KEYMultiple primary key defined Contents Possible Causes and Solutions Possible Causes and Solutions No more than oneprimary keycan be defined per table. Attempting to define more in a single table will result in this error. For example: ...
1、错误描述 10:10:38alter table user add num int(8) primary key firstError Code: 1068. Multiple primary key defined0.000 sec 2、错误原因 这个错误的原因是定义了两个主键,导致出错 3、解决办法 alter table user add num int(8) primary key first; 去掉“primary key”©...
phpMyAdminでは「エクスポート」タブからダンプファイルを作成することができます。本番環境で作成したダンプファイルを開発環境のDBで実行したら、以下のようなエラーがたくさん出てしまいました。Error Code: 1068. Multiple primary key defined…
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ERROR 1068 (42000): Multiple primary key defined 这个是因为你有两个主键: 如果你想只要一个主键ok: alter TABLE t_product CHANGE sn sn int not null default 0; 先把表t_product 的字段sn默认初始化为0; alter table t_product drop primary key; ...
but no difference between groups was reported for the primary efficacy endpoint. Slower disease progression, defined by loss of motor function over time, was indicated in the tamoxifen group compared with the placebo group, but differences in outcome measures were neither clinically nor statistically ...