查看索引
show index from sdn_system_operation;
创建唯一索引
create unique index unique_index_operation_name on sdn_system_operation(operation_name);
create unique index unique_index_operation_code on sdn_system_operation(operation_code);
create unique index unique_index_operation_nameandcode on sdn_system_operation(operation_name,operation_code);
删除唯一索引
drop index unique_index_operation_name on sdn_system_operation;
drop index unique_index_operation_code on sdn_system_operation;
drop index unique_index_operation_nameandcode on sdn_system_operation;
将UNIQUE约束添加到已存在的表中
alter table sdn_system_operation constraint unique_index_operation_name unique(operation_name);
alter table sdn_system_operation constraint unique_index_operation_code unique(operation_code);
alter table sdn_system_operation constraint unique_index_operation_nameandcode unique(operation_name,operation_code);
解除唯一索引
alter table sdn_system_operation drop index unique_index_operation_name;
alter table sdn_system_operation drop index unique_index_operation_code;
alter table sdn_system_operation drop index unique_index_operation_nameandcode;
