truncate in teradata

In this paper, we introduce the difference between truncate and delete in SQL by a simple example, and help us understand the following details. ---Create a table Table1 IF object_id (' Table1 ', ' U ') is not a NULL DROP table Table1 go CREATE table Table1 (ID int NOT NULL, foid int ' not NULL ' go --Inserts test data insert INTO Table1 VALUES (1,101), (2,102), (3,103), ( 4,104) Go ---Create a table Table2 IF object_id (' Table2 ', ' U ')

Note that the delete here is the DELETE statement without the WHERE clause Same point Truncate and delete with no WHERE clause, and drop deletes data in the table Different points: 1. Truncate and delete Delete only the data do not delete the structure of the table (definition) The DROP statement deletes the table's structure-dependent constraints (constrain), triggers (trigger), indexes (index); Stored pr

Tags: ar sp Data bs nbsp C Oracle Information TestFirst truncate is a DDL statement, and delete is a DML statement.The deletion of truncate is much faster than delete, especially when the amount of table data is large, because Truncate does not produce undo during execution, so truncate can no longer roll back. The del

Delete/truncate/drop differences 1. delete/truncate only deletes data, does not Delete the table, the index structure. Drop will delete the table structure and the index/constrain/trigger that depends on the table. The procedure/function will be retained, but will change to the invalid state; 2. delete is a dml statement. It can be rolled back after the transaction is committed. A one-time delete of a large

Differences between Truncate and delete in mysql clearing tables this article demonstrates how to use the TRUNCATE command and the differences between delete and truncate. The following describes how to delete all data instances in a mysql table. What is the difference between clearing the table truncate and delete in

Parse the usage of the string function truncate in smarty. Smartytruncate intercepts a string from the start of the string. the default length is 80. specify the second parameter as the string length. by default, smarty intercepts Smarty truncate stringTruncates a certain length of characters starting from a string. the default length is 80. Specify the second parameter as the length of the truncated string

Note: The delete statement is a delete statement without the WHERE clause. Similarities Truncate, delete without WHERE clause, and drop both delete table data. Differences:1. truncate and delete: delete only data. Do not delete the table structure (Definition)The drop statement will delete the constraints, triggers, and indexes that the table structure is dependent on. Stored Procedures/functions that d

TRUNCATE TABLE Syntax TRUNCATE TABLEName Delete all rows in the table without recording the delete operation of a single row. The truncate table function is the same as the DELETE statement without the WHERE clause: both DELETE all rows in the TABLE. However, truncate table is faster than DELETE and uses less sys

Note: Delete In this case refers to the DELETE statement without a WHERE clauseSame pointTruncate and delete without a WHERE clause, and drop deletes the data in the tableDifferent points:1. Truncate and delete only delete data without deleting the structure of the table (definition)The drop statement will delete the structure of the table that is dependent on the constraint (constrain), trigger (trigger), index (indexed); Stored procedures/functions

This article mainly introduces the mysql delete operation, including the use of delete and TRUNCATE. For more information, see Delete Syntax Single table syntax: DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name[WHERE where_definition][Order by...][LIMIT row_count] multi-table syntax: DELETE [LOW_PRIORITY] [QUICK] [IGNORE]Tbl_name [. *] [, tbl_name [. *]...]FROM table_references[WHERE where_definition] or DELETE [LOW_PRIORITY] [QUICK] [IGNORE]FROM

Deletetruncatedrop difference bitsCN.com Differences between Delete/truncate/drop 1. delete/truncate: only delete data. The index structure is not deleted. Drop will delete the table structure and the index/constrain/trigger that depends on the table. the procedure/function will be retained, but will change to the invalid state; 2. delete is a dml statement. it can be rolled back after the transaction i

The truncate table and the delete function without where are the same.All of the data in the table is deleted,However, truncate table is faster and consumes less logs.This is because the truncate table directly releases the data page and only records the release of the data page in the transaction log. The delete operation deletes the data page in one row, delete

Truncate usage in oracleTruncate in oracleSyntax: truncate table;You can use the truncate Statement (DDL language) to delete all records in a table. The truncate statement is usually much faster to delete data than to delete data. This is because no rollback information is generated when the

Label:First, syntax in SQL 1. Thedrop table name eg:drop table dbo. Sys_test2.truncate table name eg:truncate table dbo. Sys_test3.Delete from table name where column name = value Eg:delete from dbo. Sys_test where test= ' Test ' Second, Drop,truncate,delete difference 1, Drop (delete table): Delete content and definition, free space. Simply put the whole table out . It is not possible to add data in the

Oracle empty table SQL statements and truncate and delete differences TRUNCATE TABLE [name] Remove or cluster all rows from the table using the TRUNCATE statement. By default, the Oracle Database tutorial also performs the following tasks: The only exception to deallocate is that all of the storage space used in the deleted row is specified by the minextent

The truncate implicit commit colleague asked me to check the problem. procedure jumped out of exception and rolled back in the middle, but some table commit still exists, but no commit statement was found before rollback. it is still a DDL implicit commit problem. The test example is as follows: SQL> create table t1 (seq number); SQL> create table t2 (seq number); Open session 1: insert into t1 values (1); at this time, no commit is performed; session

It is estimated that many children who play smarty template have encountered the problem of cutting garbled characters. Especially the UTF8 encoded. The following code is saved as modifier.truncate2.php to the plugin directory under Smarty Libs And then cut it with $v->content|truncate2:100. It's done. If not good may be the cache caused, please speed to delete the cache file under Templates_c (small series engaged in the time of the cache problems encountered.) ）Copy CodeThe code is as follows

In some case, we found the if we execute the SQL commands like TRUNCATE TABLE, drop table, delete all records in table, Join 2 tables, it'll take very very long time, and the execution are still in progress, no any result returned.Probably It is caused by the SQL connection to the table are in using by and other sessions, so the solution is just need termi Nate those sessions by below SQL script:Kill ' SID295302 'How to view all running sessions, and

Label:mysqlfortruncatemysqcal aceonsclasstracking Select--' select * from ', Table_schema, '. ', table_name, ' to ' outfile '/work/opdir/repair '--concat (' UNION ALL ' --Select COUNT (1) as Count_, ' ', Table_schema, '. ', table_name, ' as Tbname from ', Table_schema, '. ', TABLE_NAME, ' ")--as Sql_ CONCAT (' select * from ', Table_schema, '.", TABLE_NAME, ' into outfile '/work/opdir/repair/', Table_sche MA, '. ', table_name, '. TSV '; Truncate ta

recently in writing a small based JSP system development. Mastering the database has always felt good. But today there is a problem that bothers me for half a day. Then I was ready to go to bed, but I don't think we should solve this problem tonight. Then opened the computer, and began to churn. First go to the Internet to search for a bit of trouble. But most of the results can only be said: far to see and not solve my problem. First, let me tell you about my situation: the data types and lengt