(create_definition,...) [table_options] [partition_options] 创建表的三种方式: 1、create table test (id int,name varchar); 2、create table test like Old_Table; <<会继承Old_Table的表结构 3、create table test as select * from Old_Table; <<会继承表结构以及表中的数据 数据类型: bit[(M)...
1)create table [新表名] as select * from [表名]; #将指定表的全都数据,复制到新表中 create table [新表名] like [表名]; #根据指定表的结构,创建新表 create table 表名(列信息); #创建数据表 create table cstable(id 列参数,id2 列参数); 列参数: 2)alter 命令 alter [原表名] rename...
mariadb数据库查询(select) 查询基本使用(条件,排序,聚合函数,分组,分页)示例:--创建学生表 create table students ( id int unsigned not null auto_increment primary key, name varchar(20) default '', age tinyint unsigned default 0, high decimal(5,2), gender enum('男', '女', '中性', '保密...
MariaDB [aa]> create table aa as select * from cc; 把aa表数据插入到bb表(bb表存在) MariaDB [aa]> insert into bb select * from aa; 清空表 MariaDB [aa]> delete from cc; MariaDB [aa]> truncate table dd; 删除表中某个数据 delete from 表 where xxxx; MariaDB [aa]> delete from b...
Table Create Table t1 CREATE TABLE`t1`( `f1`varchar(1)CHARACTER SET latin5 NOT NULL )ENGINE=MyISAM DEFAULTCHARSET=latin1 3.2 处理子查询中 select 语句的区别 在这条语句中SELECT a AS x, ROW(11, 12) = (SELECT MAX(x), 12), ROW(11, 12) IN (SELECT MAX(x), 12) FROM t1...
把json格式二进制转变字符。5 怎么看小明语文成绩呢？SELECT 姓名,column_get(成绩,'语文' AS CHAR) FROM chengji WHERE 姓名='小明';column_get(成绩,'语文' AS CHAR)：把语文成绩以字符返回。6 开发端编写sql时，把数组转化为column_create（）格式。数据库就能看懂数组了。
DATABASE:CREATE DATABASE、ALTER DATABASE、DROP DATABASE 暂不支持 CREATE TABLE 表名 AS SELECT 语句。 环境要求 说明: 如下环境要求,系统会在启动迁移任务前自动进行校验,不符合要求的系统会报错。如果用户能够识别出来,可以参考 校验项检查要求 自行修改,如果不能则等系统校验完成,按照报错提示修改。
MariaDB [db]> create table test as select 1 as id, 'name' as name from dual; Query OK, 1 row affected (0.008 sec) Records: 1 Duplicates: 0 Warnings: 0 MariaDB [db]> desc test; +---+---+---+---+---+---+ | Field | Type | Null | Key | Default | Extra | +---+...
Error 1723: CREATE TABLE... SELECT... on a table with an auto-increment column is unsafe because the order in which rows are retrieved by the SELECT determines which (if any) rows are inserted
CREATE TABLE table name AS SELECT is not supported. Environment requirements Type Environment Requirement Requirements for the source database The source and target databases can be connected. Requirements for instance parameters: The server_id parameter in the source database must be set manually and...