Drop Database Statement Sometimes we may decide that we need to delete of an entire database in the RDBMS. In fact, if we cannot do so, we would be faced with a maintenance nightmare. Fortunately, SQL allows us to do it, as we can use the DROP DATABASE command. ...
DROP DATABASE databasename; Note: Be careful before dropping a database. Deleting a database will result in loss of complete information stored in the database!DROP DATABASE ExampleThe following SQL statement drops the existing database "testDB":...
1 CREATE DATABASE 句法 2 3 CREATE DATABASE [IF NOT EXISTS] db_name 4 5 CREATE DATABASE 以给定名字创建一个数据库。允许的数据库名规则在章节 6.1.2 数据库、表、索引、列和别名 中被给出。 如果数据库已经存在,并且你...
create database mydb1; 创建一个使用gbk字符集的mydb2数据库。create database mydb2 character set gbk; 创建一个使用utf8字符集,并带校对规则的mydb3数据库。create database mydb3 character set utf-8 collate utf8_bin; 2. 查看数据库 显示数据库创建语句:SHOWCREATE DATABASEdb_name 查看当前数据库服...
3. SQL语句的类型 常用的为以下4类: DDL(Data DefinitionLanguage):数据模式定义语言 DCL(Data ControlLanguage):数据控制语言 DML(Data ManipulationLanguage):数据模式操作语言 DQL(Data QueryLanguage):数据模式查询语言 4. 数据类型 4.1 数据类型的基本作用 ...
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...
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
%%sql INSERT INTO company (name, description, primary_contact_id) VALUES ('RexApp Solutions', 'A mobile app delivery service', 3) * sqlite:///DataBase/surgetech_conference2.db 1 rows affected. 可以看到成功添加了。 1.4 删除数据 DELETE 语句既简单又危险,你可以使用一行命令将一整个表的数据删除...
SqlServer.TransactSql.ScriptDom AbortAfterWaitType AcceleratedDatabaseRecoveryDatabaseOption AddAlterFullTextIndexAction AddFileSpec AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource AdHocTableReference AffinityKind AlgorithmKeyOption Allow...
SQL Server To drop a database published for transactional replication, or published or subscribed to merge replication, you must first remove replication from the database. If a database is damaged, or replication can't first be removed (or both), in most cases you still can drop the data...