1.2 删除表:drop sql命令 代码语言:sql AI代码解释 droptabletable_name;droptableifexiststable_name; 注意: drop会删除整个表,包括表结构和数据,释放空间 立即执行,执行速度最快 不可回滚 1.3 删除/清空表数据:delete sql命令 代码语言:sql AI代码解释 #删除部分数据deletefromtb_namewhereclause;#清空表,仅删除...
TRUNCATE [TABLE] table_name; 或 ALTER TABLE [IF EXISTS] table_name TRUNCATE PARTITION { partition_name | FOR ( partition_value [, ...] ) } 参数:table_name:需要删除数据的Table名称。partition_name:需要删除的分区表的分区名称。partition_value:需要删除的分区表的分区值。 3、示例1 以下示例演示T...
hive> drop table if exists 表名;drop table if exists table_name; 三、删除库 hive> drop database if exists 库名; 注意如果库里有表会报错 解决这个错误有两种方法:一、就是很简单的将所有表先删除完,再删除库。 另外一种就是使用下述的方法:使用cascade关键字执行强制删库。drop database if exists ...
Execute SQL task fail for Droping a table if exists? Execute SQL Task in Control Flow with a @StartDate and @EndDate DATETIME Parameters Execute SQL Task size limitation? Execute SQL Task using ADO.NET connection To execute a stored procedure with input parameters Execute SQL Task: Error Exec...
alter table test2 check constraint all; 缺点:同方法二,DML操作无法回滚 Delete总缺点:自增值未重置,会继续自增。 二、Truncate(a.自增键从初始值重新开始;b.无法事务回滚) 只能删除外键约束再truncate,最后再重新创建外键约束。 由于本次主要目的是:1.删除数据;2.重置自增值; ...
Sql - Drop all tables in a Redshift schema, In addition to demircioglu's answer, I had to add Commit after every drop statement to drop all tables in my schema. SELECT 'DROP TABLE IF EXISTS ' || tablename || ' CASCADE; COMMIT;' FROM pg_tables WHERE schemaname = '<your_schema>'...
--删除 employees 表DROPTABLEemployees;--删除 employees 表(如果存在)DROPTABLEIFEXISTSemployees; 1. 2. 3. 4. 5. 特点: 删除整个表结构,包括所有数据、索引、触发器、约束等。 操作不可逆,无法回滚。 速度非常快。 不会激活触发器。 TRUNCATE 语句 ...
Replication and CHECKSUM TABLE Replication of CREATE SERVER, ALTER SERVER, and DROP SERVER Replication of CREATE ... IF NOT EXISTS Statements Replication of CREATE TABLE ... SELECT Statements Replication of CURRENT_USER() Replication with Differing Table Definitions on Source and Replica Repl...
The difference in TRUNCATE and DELETE in Sql Server I’ve answered this question many times, and answered it again this weekend. What is the difference when doing aDELETE TableAinstead ofTRUNCATE TableA? A common misconception is that they do the same thing. Not so. In fact, there are ma...
AlterServerRoleStatement AlterServiceMasterKeyOption AlterServiceMasterKeyStatement AlterServiceStatement AlterSymmetricKeyStatement AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationS...