I'd like to know how to get a list of databases through the use of an SQL query. The "Show Databases" works from a command line, but I need a query and I'm having problems finding such references on the web. Thanks folks... ct - Happiness is a belt fed weapon......
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之后,只能导出mysql系统库中的非data dictionary table。之前版本当使用–all-databases参数导出数据的时候,不加–routines和–events也可以导出触发器、存储过程等信息,因为这些信息都存放于proc和event表中,导出所有表即可导出这些信息。但是在8.0中,proc表和event表都不再使用,并且定义触发器、存储过程的数据表不会...
4.查看数据库 showdatabases; 5.清空当前命令行界面命令 clear; 6.创建表 auto_increment:自增 字符串使用单引号括起来 所有语句后面加逗号,英文的,最后一个不用加 primary key主键,一般一个表只有一个唯一的主键,且必须要有 engine=innodb:数据库表的引擎 mysql>createtableifnotexistsstudent(->idint(4)notnu...
SQL优化,算是数据库优化的一个子集。 因此,吹大牛的候选人简历上,会赫然写着”擅长MySQL数据库优化“,而吹小牛的候选人简历上,往往会写”擅长SQL优化“。 但结局是殊途同归的,就是当问他们用什么方式做的优化,他们都会说上三个字:”加索引“。 当然,好一点儿的会说可以加联合索引,它有最左前缀匹配原则(8.0...
1.容灾备份恢复必备条件MySQL 数据库开启了log-bin参数记录binlog日志功能,且主库于备份的从库都要开启binlo功能。 1.全量备份全量数据就是数据库中所有的数据,全量备份就是把数据库中所有的数据进行备份。 案例: 代码语言:javascript 代码运行次数:0
('_', r'\_'), character_set or existing.get('character_set'), collate or existing.get('collate')) args = {} _execute(cur, qry, args) def db_get(name, **connection_args): ''' Return a list of databases of a MySQL server using the output from the ``SELECT DEFAULT_CHARACTER_...
mysql> show databases; mysql> use mysql; mysql> update user set authentication_string=PASSWORD("root") where user="root"; mysql> update user set plugin="mysql_native_password"; mysql> flush privileges; mysql> quit; 1. 2. 3. 4.
MYSQL_RES*mysql_list_dbs(MYSQL*mysql,constchar*wild) Description Returns a result set consisting of database names on the server that match the simple regular expression specified by thewildparameter.wildmay contain the wildcard characters%or_, or may be aNULLpointer to match all databases. Cal...
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