去 ❈ 删除多个数据库: 使用大师; GO DROP DATABASE 数据库1, 数据库2, ...; 去 删除SQL数据库前请备份重要数据 上文对如何删除sql数据库问题进行了详细的探讨,但是我们还是要继续强调一下备份的重要性。 傲梅企业备份旗舰版是一款专业、可靠的SQL数据库备份软件,可帮助您轻松、自信地保护您的关键...
DELETEoperations irreversibly delete one or more rows of data from a database table. Being such a fundamental aspect of data management, it’s important for SQL users to understand how theDELETEstatement works.
DELETE - SQL 命令 文章 19/01/2017 在此文章 語法 引數 備註 驅動程式備註 另請參閱 標記要刪除的記錄。 Visual FoxPro ODBC Driver 支援此命令的原生 Visual FoxPro 語言語法。 如需驅動程式特定資訊,請參閱。 語法 DELETE FROM [DatabaseName!]TableName [WHERE FilterCondition1 [AND | OR FilterCondition...
而DELETE会将表中数据进行标记,直到VACCUUM FULL阶段才会真正清理磁盘空间。 • DELETE有主键或索引的表,WHERE条件应结合主键或索引,提高执行效率。 • DELETE 语句每次删除一行,并在事务日志中为所删除的每行记录一项。 • 如果想保留标识计数值,请改用 DELETE 3、语法 DELETE FROM table_name [WHERE condition...
What is the purpose of the SQLDROP DATABASEstatement? To delete a table from a database To delete all records in a table To delete an existing database To delete specific rows from a database Submit Answer » Track your progress - it's free!
2、建立数据库:mysql> CREATE DATABASE 库名; 3、建立数据表:mysql> USE 库名;mysql> CREATE TABLE 表名 (字段名 VARCHAR(20), 字段名 CHAR(1)); 4、删除数据库:mysql> DROP DATABASE 库名; 5、删除数据表:mysql> DROP TABLE 表名; 6、将表中记录清空:mysql> DELETE FROM 表名; ...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance This article describes how to delete a user-defined database in SQL Server by using SQL Server Management Studio or Transact-SQL. Prerequisites Delete any database snapshots that exist on the database. For more information, ...
D(Delete):删除 * 删除数据库 * drop database 数据库名称; * 判断数据库存在,存在再删除 * drop database if exists 数据库名称; 5. 使用数据库 * 查询当前正在使用的数据库名称 * select database(); * 使用数据库 * use 数据库名称; 2. 操作表 1. C(Create):创建 1. 语法: create table 表...
一、SQL DELETE 语句使用DELETE从表中删除目标行。记录每次删除操作。 DELETE FROM table_name WHERE some_column=some_value;请注意 SQL DELETE 语句中的 WHERE 子句!WHERE 子句规定哪条… 云水禅心 经典SQL语句大全 1、说明:创建数据库 CREATE DATABASE database-name2、说明:删除数据库 drop database dbname ...
DROP DATABASEThe DROP DATABASE command is used to delete an existing SQL database. The following SQL drops a database named "testDB":Example DROP DATABASE testDB; Note: Be careful before dropping a database. Deleting a database will result in loss of complete information stored in the ...