摘要:
1.添加字段 alter table [table_name] add [column_name] [column_type] 2.更改字段类型 alter table [table_name] alter column [column_name] set data type [column_typ 阅读全文
摘要:
创建、删除唯一约束: db2 "alter table tabname add unique(colname)" db2 "alter table tabname drop unique CONSTNAME " 创建主键约束: db2 "alter table staff add primary k 阅读全文