DROP DATABASE database_name; In the above query, -database_name - is the name of the database to be dropped DROP DATABASE Example: If you want to drop database MyDatabase, the statement would be like DROP DATABASE MyDatabase ; DROP STATEMENT CAUTION DROP is a powerful statement. A ...
Query OK,1row affected (0.00sec) mysql>mysql>DROPDATABASEIFEXISTSA2;#删除一个库如果你不确定该库是否存在时,你可以使用判断语句,既然改库不存在你也不怕报错啦～Query OK,1row affected (0.01sec) mysql>mysql>SHOW DATABASES;+---+|Database|+---+|A3||course||day03||devops||information_schema|...
In the above DROP DATABASE query example, we dropped the database with the IF EXISTS parameter database name demodb. The query will remove the database if the database resides in the SQL Server. The warning output is displayed if the database is already removed from the SQL Server, and ...
-- SQL Server Syntax DROP DATABASE [ IF EXISTS ] { database_name | database_snapshot_name } [ ,...n ] [;] syntaxsql Copia -- Azure SQL Database, Azure Synapse Analytics and Analytics Platform System Syntax DROP DATABASE database_name [;] Nota...
$sql='DROP DATABASE RUNOON'; $retval=mysqli_query($conn,$sql); if(!$retval) { die('删除数据库失败: '.mysqli_error($conn)); } echo"数据库 RUNOON 删除成功\n"; mysqli_close($conn); ?> 执行成功后,数结果为: 注意:在使用PHP脚本...
DROPDATABASEdbname1,dbname2,...Code language:SQL (Structured Query Language)(sql) SQL DROP DATABASE example Let’s practice with an example to get familiar with theDROP DATABASEstatement. First, create a new database for the practicing purpose. If you don’t know how to create a new data...
DROP DATABASE school; 上述示例中,我们使用DROP DATABASE命令删除了名为school的数据库及其包含的所有对象。 注意事项 1、使用DROP语句时要小心,因为它会永久删除指定的数据库对象及其相关的数据和结构,在执行DROP语句之前,请确保已经备份好相关数据。 2、删除表、视图、触发器等对象时,需要确保没有其他对象依赖于它...
snapshots (SQL Server). Dropping a database snapshot clears entries in the plan cache associated with the database snapshot, not the instance as a whole. Clearing the plan cache causes a recompilation of all subsequent execution plans and can cause a sudden, temporary decrease in query ...
本文分为5个部分,即drop、alter、insert 和analyze、Flink SQL常见的操作示例。 一、DROP DROP 语句可用于删除指定的 catalog,也可用于从当前或指定的 Catalog 中删除一个已经注册的表、视图或函数。 Flink SQL 截至版本Flink 1.17支持以下 DROP 语句: DROP CATALOG DROP TABLE DROP DATABASE DROP VIEW DROP FUNCTI...
DROP DATABASE语句用于删除数据库。 语法 drop_database_stmt: DROP DATABASE [IF EXISTS] database_name; 参数说明 参数 说明 IF EXISTS 用于防止当数据库不存在时发生错误。 database_name 指定待删除的数据库名。 示例 删除数据库test。 drop database customer; Query OK, 0 rows affected (0.03 sec) dro...