删除一张表或是一数据库 To delete a table (the table structure, attributes, and indexes will also be deleted): 删除一张表(表中的数据结构,属性以及索引也会被删除): DROP TABLE table_name To delete a database: 要删除一个数据库的话可以这样写: DROP DATABASE database_name --- Truncate a T...
SQLDropTable SQLDropTable[conn,table] drops a table in an SQL connection. SQLDropTable[conn,SQLTable[table]] drops a table in an SQL connection. 更多信息和选项 范例 基本范例(1) In[1]:= If you find that the examples in this section do not work as shown, you may need to ins...
drop table class,就是把整个班移除.学生和职务都消失 比如下面TestSchool数据库中有两张表[Classes]表和[Teacher]表 当执行下面代码之后 Classes表就被清楚,一干二净! 删除得非常暴力,作为老大实至名归 老二—–truncate 出没场合:truncate table tb 绝招:删除内容、释放空间但不删除定义。与drop不同的是,他只是...
DROP TABLE [IF EXISTS] [db_name.]table_name; 说明:SQL中加[IF EXISTS] ,可以防止因表不存在而导致执行报错。 参数:db_name:Database名称。如果未指定,将选择当前database。table_name:需要删除的Table名称。 3、示例 以下示例演示DROP命令的使用,依次执行如下SQL语句: --删除整个表course DROP TABLE IF EX...
SQL DROP TABLE Example The following SQL statement drops the existing table "Shippers": ExampleGet your own SQL Server DROPTABLEShippers; SQL TRUNCATE TABLE TheTRUNCATE TABLEstatement is used to delete the data inside a table, but not the table itself. ...
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ALTERTABLE<表名>DROP(<列名>,<列名>,……); 1. 例如,我们可以使用代码清单 5 中的语句来删除之前添加的 product_name_pinyin 列。 代码清单 5 删除product_name_pinyin列 SQL Server DB2 PostgreSQL MySQL ALTERTABLEProductDROPCOLUMN product_name_pinyin; ...
What is the SQL DROP TABLE Statement?The SQL DROP TABLE statement is the SQL command that removes an entire SQL table. Why Use the SQL DROP TABLE Statement?When a SQL table must be removed, use the SQL DROP TABLE statement. For example, you may have a created a temporary table to st...
SQL语言与数据库操作技术大全3.6.2 删除基本表——DROP TABLE第3章数据库与表的操作在关系数据库中,数据都是存储在表中的。在上一章已经讨论了在SQLServer2005中使用ManagementStudio创建数据库和表。在本章将主要介绍使用SQL对数据库和表进
Drop Table ToolThe Drop Table Tool allows users to select a table to be dropped. The tool then generates the SQL to drop the table. Listed below is an example SQL statement generated by the Drop Table Tool. DROP TABLE public.employee ...