DROP TABLE语句 在MySQL中,我们可以使用DROP TABLE语句删除一个表。语法如下所示: DROPTABLE[IFEXISTS]table_name; 1. DROP TABLE语句用于删除指定的表。如果表不存在,将会抛出一个错误。为了避免这个错误,我们可以使用IF EXISTS选项。 IF EXISTS选项 IF EXISTS选项用于在删除表之前检查表是否存在。如果表不存在,则...
1、表存在则删除;2、表不存在则创建; mysql: drop table if exists `test`; create table if not exists `test` (`id` integer not null, `name` varchar(10), primary key(`id`)); 1. 2. sqlserver: if exists (select count(*) from [sys].[schemas] S JOIN [sys].[tables] T ON S.sche...
Bug #12024 Strange results with 'create/drop table if (not) exists' Submitted: 19 Jul 2005 0:46Modified: 27 Jul 2005 8:35 Reporter: Markus Popp Email Updates: Status: Not a Bug Impact on me: None Category: MySQL ServerSeverity: S3 (Non-critical) Version: 5.0.9-betaOS: Linux (...
DROPDATABASEIFEXISTSmytest1;2. 对比 TRUNCATE TABLE 和 DELETE FROM 相同点：都可以实现对表中所有数...
TheDROP DATABASE IF EXISTS,DROP TABLE IF EXISTS, andDROP VIEW IF EXISTSstatements are always replicated, even if the database, table, or view to be dropped does not exist on the source. This is to ensure that the object to be dropped no longer exists on either the source or the replic...
table option w/ mysqldump).How to repeat:Execute: DROP TABLE IF EXISTS bogus; where bogus is the name of a table that does not exist.Suggested fix:Do not produce a warning if the table does not exist. The "IF EXISTS" clause implies that the user doesn't care whether the table ...
tel int not null comment '电话', stusex bit default 1) [engine=lnnodb default charset=utf-8]; (3)图表架构如下 2、删除数据表 (1)查看目前所有数据表 SHOW TABLES; (2)删除指定数据表 DROP TABLE IF EXISTS Pikachu; 3、修改数据表 (1)修改列名 ...
Views Written By Posted DROP TRIGGER IF NOT EXISTS 2047 Edwin DeSouza November 15, 2006 07:56PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and doe...
mysql> CREATE TABLE table_name( name VARCHAR(50) NOT NULL); ERROR 1050 (42S01): Table'table_name'already exists mysql> 删除表的基本SQL语法格式为: DROPTABLEtable_name;DROPTABLE[IFEXISTS] table_name; DROP TABLE table_name;删除一个名为 table_name的表 ...
DROP TRIGGER IF NOT EXISTS 2051 Edwin DeSouza November 15, 2006 07:56PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represen...