=t2.new_primary_key AND t1.column1=t2.column1 (AND t1.column2=t2.column2 )* ;2. 有主键但不是int型。CREATE TABLE IF NOT EXISTS 字符串 原创 smart818 2013-10-07 18:20:59 1007阅读 oacle 删除重复数据 --测试数据create table test as select * from dba_objects;insert into test ...
## 基本语法 SUM函数的基本语法如下: ```sql SELECT SUM(column_name) FROM table_name; ``` 其中,`column_name`是要进行求和的列名 重复数据 sql MySQL 原创 mob649e8167c4a3 2023-08-16 10:21:32 1482阅读 lua查询重复数据 lua去重复 1.Lua允许"多重赋值",每个变量之间以逗号分隔。例如:a,b ...
there can be only one auto column and it must be defined as a key 云数据库 SQL Server MySQL主键与非主键设置自增问题: ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key 开始: MySQL [liangcb]> show create table a5; +-...