From theDatabasedrop-down list, select a database. UnderTable, select a table or use the search field to search for a table by name. Drag a table to the canvas, and then select the sheet tab to start your analysis. Use custom SQL to connect to a specific query rather than the entir...
Se nessun database è selezionato, DATABASE() restituisce NULL. Nelle Stored Routine, il database di default è quello al quale è associata la routine, che non è necessariamente lo stesso database selezionato nel contesto chiamante. Esempi MariaDB [(none)]> SELECT DATABASE(); +---...
MariaDB [yinzhengjie]> SELECT * FROM students WHERE mobile is not null; #查询mobile这一列不为空的行 MariaDB [yinzhengjie]> SELECT * FROM students WHERE age IN (28,38); #查询age=28或者age=38的行 MariaDB [yinzhengjie]> SELECT * FROM students WHERE age BETWEEN 25 AND 28; #查询age在...
select*fromv$database; select*fromall_users; select*fromuser_tables; mysqldump [options] |gzip ->mysqldump-$(date +%Y-%m-%d-%H.%M.%S).gz 转存mysql数据库
1.安装maria database Centos 8 上,默认安装的mariadb服务器版本为:MariaDB Community Server 10.3 dnf install mariadb-server 命令进行安装,本人已测试OK 代码语言:javascript 代码运行次数:0 运行 AI代码解释 dnf install mariadb-server 也可以使用如下命令来安装,本人未经测试 ...
<html><head><title>Delete a MariaDB Database</title></head><body><?php $dbhost='localhost:3036';$dbuser='root';$dbpass='rootpassword';$conn=mysql_connect($dbhost,$dbuser,$dbpass);if(!$conn){die('Could not connect: '.mysql_error());}echo'Connected successfully<br />';$sql=...
By default, MariaDB comes with a database named 'test' that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. Remove test database and access to it? [Y/n] y //是否删除test数据库,直接回车 ...
select database(); 查询正在使用的数据库 show tables; 显示当前数据库里所有的数据表 desc 表名; 描述这个表的信息 create database student; 创建数据库 创建数据表 CREATE TABLE 表名 ( 属性名 数据类型 [约束条件], 属性名 数据类型 [约束条件], ...
8、查看表格中的数据:这里我们就以刚才的案例为例,查看一下刚才在“userInfo”数据库中插入的数据。这里我们要用到“select”命令,如图8所示 图8 9、修改数据:还是拿刚才的案例来演示,我们把那么字段值“jacky”换成“jackie”。这里我们要用到“update”命令,具体命令为“update userInfo set name ='jackie' whe...
MariaDB [test]> select t1.id from t1 join t2 on t1.id=t2.cid; ERROR 1815 (HY000): Internal error: IDB-1002: 't1' and 't2' have incompatible column type specified for join condition. 4、alter不支持change/modify更改字段属性 MariaDB [test]> alter table t1 change id id bigint; ERROR...