There is nothing to compare between TRUNCATE and DELETE as observed in the above table. It is obvious that TRUNCATE is much faster and use fewer resources than the DELETE statement in all aspects. Comparison of Transaction Log File Let us compare the usage of transaction log file during the ...
Make sure that the TRUNCATE command is used to remove rows only, not the columns or database, in SQL. TRUNCATE TABLE Syntax We use the TRUNCATE TABLE statement and pass the name of the table in which you want to delete the rows. TRUNCATE TABLE table_name; Example of TRUNCATE TABLE Let...
The article will overview the TRUNCATE TABLE statement in SQL on particular examples and describe the differences between the TRUNCATE,DELETE, and DROP statements. When you use the TRUNCATE TABLE statement, it simply removes data from the table but keeps the structure unchangeable, and makes entries...
上线前有一项重要的任务就是清理 MySQL 数据库中的测试数据。 简单粗暴的所有表都 truncate 一遍是不行的。因为还有一些是配置项表,和数据字典表,清空了就白忙活了。所以,需要记录哪些表是可以清理的,哪些是不行。 😅 使用 truncate 还是 delete 清理前,还有一个重要的概念。就是究竟是用 truncate 还是 delete...
一、SQL中的语法 1、drop table表名称 eg: drop table dbo.Sys_Test 2、truncate table表名称 eg: truncate table dbo.Sys_Test 3、delete from表名称where列名称 = 值 eg: delete from dbo.Sys_Test where test='test' 二、drop,truncate,delete区别 ...
SQL> truncate table test01; Table truncated 1. 2. STEP4:修改存储过程,酶促插入100条数据, SQL> --创建随机数据插入存储过程,其中col1列单调递增 SQL> create or replace procedure p_insert_test01 IS 2 v_col1 NUMBER; 3 BEGIN 4 FOR i IN 1..100 LOOP 5 select seq01.nextval INTO v_col1 ...
This SQL tutorial explains how to use the SQL TRUNCATE TABLE statement with syntax, and examples. The SQL TRUNCATE statement is a used to remove all records from a table.
USEtemp_test_databaseGO--创建一个临时表CREATETABLETruncateTabel(IDINT)INSERTINTOTruncateTabel(ID)SELECT1UNIONALLSELECT2UNIONALLSELECT3GO--检查插入的数据SELECT*FROMTruncateTabel 如图: 开始执行事务 --开始事务BEGINTRANTRUNCATETABLETruncateTabelGO--回滚之前检查TruncateTableSELECT*FROMTruncateTabelGO ...
事务用于将某些操作的多个SQL作为原子性操作,一旦有某一个出现错误,即可回滚到原来的状态,从而保证数据库数据完整性。 举例:有这样一张表 从表里可以看出张三的资金里有850元,李四的资金有632元 假如张三向李四划款20元,那么张三的资金应该减20,李四的资金应该加20 可以看到张三的资金以减20,李四的资金以加20 但是...
With the Partitioning,OLAP,Data Mining and Real Application Testing optionsSQL>settime on11:11:43SQL>setserveroutput on11:11:54SQL>exec fy_recover_data.recover_truncated_table('TEST','TEST01');11:12:01:Use existing Directory Name:FY_DATA_DIR11:12:02:Recover Table:TEST.TEST01$11:12:02:...