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 DATAB
The DROP command removes all the objects stored in the database and database from the SQL server. The DROP query removes the database permanently from the SQL Server. If tables and views stored in the database are important for you, then the data backup needs to be kept in another datab...
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|...
1 DROP DATABASE db_test; Drop Table 该语句用于删除表(table) 语法: Plain Text 复制 1 DROP TABLE [IF EXISTS] [db_name.]table_name; 举例: 1.删除一个 table Plain Text 复制 1 DROP TABLE my_table; 2.如果存在,删除指定 database 的 table Plain Text 复制 1 DROP TABLE IF EXISTS examp...
DROP TABLE Student; This query drops/deletes the entire Database School. 1 DROP DATABASE School; TRUNCATE The SQL TRUNCATE command is used to delete all the records/rows from the table without affecting the schema and structure of the database. The TRUNCATE Command is a Data Definition Langua...
Dropping a database snapshot clears the plan cache for the instance of SQL Server. Clearing the plan cache causes a recompilation of all subsequent execution plans and can cause a sudden, temporary decrease in query performance. For each cleared cachestore in the plan cache, the SQL Server ...
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 ...
Syntax to drop a sql table structure:DROP TABLE table_name; SQL DROP Statement Example To drop the table employee, the query would be likeDROP TABLE employee; Difference between DROP and TRUNCATE Statement:If a table is dropped, all the relationships with other tables will no longer be valid...
DROP QUERY Test.BonusCalc FROM Employees.queryBonusCalc:drops the query Employees.BonusCalc(). 如果指定的查询不存在,DROP QUERY将生成SQLCODE-362错误。如果指定的类不存在,DROP QUERY将生成SQLCODE-360错误。如果指定的查询可以引用两个或多个查询,DROP QUERY将生成SQLCODE-361错误;必须指定一个类名来解决此歧义...
一、DROP 1、DROP CATALOG 2、DROP DATABASE 3、DROP TABLE 4、DROP VIEW 5、DROP FUNCTION 6、drop table示例 二、alter 1、ALTER DATABASE 2、ALTER TABLE 1)、建表 2)、ADD 1、增加单列示例 2、增加watermark列 3)、MODIFY 1、修改列 2、修改水印 4)、DROP 5)、RENAME 6)、SET 7)、RESET 3、AL...