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查时间:select now(); 查询当前所在的库: select database(); 查询库名: mysql> show databases; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 47 Current database: *** NONE *** +---+ | Database | +---+ | information_schema | |...
TablePrivs:NULLResourcePrivs:NULLCloudCluster: not_exist_cluster: Usage_priv (false) CloudStage:NULL 使用不存在集群not_exist_cluster。 USE information_schema@not_exist_cluster; 返回结果如下: Noconnection. Tryingtoreconnect... Connection id:1Currentdatabase:***NONE***ERROR5091(42000): Cluster not...
拥有ADMIN权限,或GLOBAL和DATABASE层级的GRANT权限的用户可以创建新用户。 DROP USER 拥有ADMIN权限或全局层级的GRANT权限的用户可以删除用户。 CREATE/DROP ROLE 拥有ADMIN权限或全局层级的GRANT权限的用户可以创建角色。 GRANT/REVOKE 拥有ADMIN权限,或者GLOBAL层级GRANT权限的用户,可以授予或撤销任意用户的权限。
CREATE DATABASE CREATE FUNCTION (SQL) CREATE FUNCTION (外部) CREATE LOCATION CREATE MATERIALIZED VIEW CREATE RECIPIENT CREATE SCHEMA CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE 數據表屬性和數據表選項 CREATE TABLE 使用 Hive 格式 CREATE TABLE CONSTRAINT CREATE TABLE USING CREATE TABLE ...
mysqli_free_result($result);}/* change db to world db */mysqli_select_db($link, "world");/* return name of current default database */if ($result = mysqli_query($link, "SELECT DATABASE()")) { $row = mysqli_fetch_row($result); printf("Default database is %s.\n", $row[...
mysql> CREATE DATABASE IF NOT EXISTS testdb CHARACTER SET 'gbk' COLLATE 'gbk_chinese_ci'; (2)、删除数据库 DROP DATABASE [IF EXISTS] db_name; mysql> DROP DATABASE testdb; (3)、查看所有数据库 SHOW DATABASES; mysql> SHOW DATABASES; 二、表管理 (1)、创建表 CREATE TABLE [IF NOT EXISTS...
need to check below multiple conditions before populating the data If record has a combination of duplicate id, addr and Ind, then select the max(update_date) from that record. If record has a combination of duplicate id, addr, Ind and update_Date, select only one record from the ...
1. The filter icon in the column header and the record navigator bar indicates that the current view is filtered on the BirthDate column. 2. In the datasheet view, when you hover, the mouse, over the column heading, you will see the current filter criterion....
支持使用DATABASE LINK方式对远端表、同义词进行操作,使用方式详情请见DATABASE LINK。 alias 给表或复杂的表引用起一个临时的表别名,以便被其余的查询引用。 别名用于缩写或者在自连接中消除歧义。如果提供了别名,它就会完全代替表的实际名称。 当为JOIN产生的表joined_table指定别名时,如果joined_table被()包裹,...