DROP TABLE table_name; 2. 截断:截断是一个DDL(数据定义语言)命令。它用于删除表中的所有元组。与 DROP 命令一样,TRUNCATE 命令也不包含 WHERE 子句。 TRUNCATE 命令比 DROP 和 DELETE 命令更快。与 DROP 命令一样,使用此命令后我们也无法回滚数据。 TRUNCATE 命令的语法 - TRUNCATE TABLE table_name; 让我...
(Data Manipulation Language 数据操作语言) 2、从表结构角度truncate、delete只删除数据,不删除表结构drop删除数据和表结构 3、从安全角度truncate、drop不支持回滚delete支持 4、从速率角度(如图)droptableEmployees和truncatetableEmployees查询开销为0% delete from ...
The difference between the DROP and DELETE tables is that, after executing the DELETE statement, the contents of the table are removed, but the structure remains the same, but in the case of the DROP statement, both the contents and structure are removed. Conclusion In this article, I h...
You would DROP the table if you do not intend on using the table again. You would TRUNCATE a table if you intend to use the table again. I would imagine the speed difference is insignificant compared to doing what is functionally correct for your situation. The only case where the speed ...
Next, we will run the TRUNCATE TABLE on the customer_details table and DROP TABLE on the student’s table, and then we will check the difference. Command: TRUNCATETABLEcustomer_details; Output: Command: DROPTABLEstudents; Output: We can observe from the images above that the DROP TABLE state...
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...
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...
deletes single, several, or all the existing records from the targeted table. While theDROP TABLEcommand not only drops the table’s data but also deletes the table’s structure permanently. Through relevant examples, this post explained the difference between the TRUNCATE, DROP, and DELETE ...
Now, let's see the difference between DELETE and TRUNCATE Command. S.No DELETE TRUNCATE 1 DELETE is a DML Command. TRUNCATE is a DDL Command. 2 DELETE is used to delete the records based on a condition. TRUNCATE is used to remove all the records from a table. 3 WHERE Clause can...
TRUNCATE TABLE通过释放存储表数据所用的数据页来删除数；TRUNCATE语句删除表时，不会产生回滚记录；delete...