SHOW [FULL] {COLUMNS | FIELDS} FROM tbl_name [FROM db_name] [LIKE 'pattern' | WHERE expr] Contents Syntax Description Examples See Also Description SHOW COLUMNS displays information about the columns in a give
MariaDB [westos]> ALTER TABLE linux RENAME messages; ##对表格名称的修改; Query OK, 0 rows affected (0.05 sec) MariaDB [westos]> SHOW TABLES; +---+ | Tables_in_westos | +---+ | messages | +---+ 1 row in set (0.00 sec) MariaDB [westos]> ALTER TABLE messages ADD age varchar...
mysql> HELP CREATE TABLE; 3>.表操作 表: 二维关系 设计表: 遵循规范 定义:字段,索引 字段:字段名,字段数据类型,修饰符 约束,索引:应该创建在经常用作查询条件的字段上 查看所有的引擎: SHOW ENGINES 查看表: SHOW TABLES [FROM db_name] 查看表结构: DESC [db_name.]tb_name SHOW COLUMNS FROM [db_n...
MariaDB允许使用各种列数据类型、字符和排序规则。 存储引擎 可用于MariaDB的存储引擎信息。 Don't see the content you are looking for above? Try these related English language items. Data Types Data types for columns in MariaDB tables. Character Sets and Collations ...
MariaDB [(数据库名)]> drop table 表名; MariaDB [(none)]> drop table test.user; --删除test库中的user表 Query OK, 0 rows affected (0.00 sec) 1. 2. 3. 4. 删除数据库: MariaDB [(none)]> drop database 数据库名; MariaDB [(none)]> drop database test; --删除test库 Query OK...
create table t1(id int comment '主键''ID')engine=Columnstore; 7、不支持主键自增 二、SQL语句限制 1、查询的字段不在group by里,就不能分组统计 错误写法: 代码语言:sql AI代码解释 MariaDB[test]>selectidfromt1groupbyname;ERROR1815(HY000): Internal error: MCS-2021:'`test`.`t1`.`id`'isnotin...
GROUP BY clause.正确写法：MariaDB [test]> select name from t1 group by name;2、alter不支持多列操作和不支持afterMariaDB [test]> alter table t1 add age tinyint,add address varchar(100);ERROR 1178 (42000): The storage engine for the table doesn't support Multiple actions in alter table ...
All non-aggregate columns in the SELECT and ORDER BY clause must be included in the GROUP BY clause. 正确写法: MariaDB [test]> select name from t1 group by name; 2、alter不支持多列操作和不支持after MariaDB [test]> alter table t1 add age tinyint,add address varchar(100); ERROR 1178...
MariaDB [test]> alter table t1 add age tinyint,add address varchar(100); ERROR 1178 (42000): The storage engine for the table doesn't support Multiple actions in alter table statement is currently not supported by Columnstore. 3、字段类型不同 join 关联查询报错,比如表1的id字段为int,表2的...
1 row in set (0.002 sec) 第三部分 普通表增减系统版本信息 mariadb [wuhan]> create table wuhan.t2(id int not null,keyname varchar(20)); query ok, 0 rows affected (0.006 sec) 添加版本信息: mariadb [wuhan]> show create table wuhan.t2\g ...