truncate in teradata

When the data in the table is not required, Delete the data and release the occupied space. To Delete the data in the table, use the Delete statement or the Truncate statement. Www.2cto.com 1. delete Statement (1) conditional deletion syntax format: delete [from] table_name [where condition]; for example, delete data whose userid is '001' in users table: delete from users where userid = '001'; (2) delete the entire table unconditionally. Syntax: delet

Truncate table Delete all rows in the table without recording the delete operation of a single row.Syntax Truncate tableNameParameters Name Is the name of the table to be truncated or the name of the table to delete all its rows.Note The truncate table function is the same as the delete statement without the WHERE clause: both delete all rows in the table. H

Truncate table clears the TABLE content. TRUNCATE table deletes all rows in the TABLE, but does not record the deletion of a single row. The truncate table is similar to the DELETE statement without a WHERE clause. However, the truncate table is faster and uses fewer system resources and transaction log resources. Synt

Note: The delete statements without the where clause share the same points: truncate, delete without the where clause, and drop both delete table data. Note: The delete statements without the where clause share the same points: truncate, delete without the where clause, and drop both delete table data. Differences: 1. truncate and delete: delete only data. Do no

When the data in the table is not needed, you should delete the data and release the space occupied, and the data in the table can be deleted using the DELETE statement or the TRUNCATE statement, described separately below. A, DELETE statement(1) Conditional deletion Syntax format: delete [from] table_name [where condition]; For example: Delete data from the users Table of UserID ' 001 ': Delete from users where userid= ' 001 '; (2) Unconditional

Truncate is a unique keyword in Oracle. Its role is to empty a table, and in the deletion of data, and delete some of the differences, so that they can remember: 1, in function, truncate is to empty the contents of a table, it is equivalent to delete from table_name.2. Delete is a DML operation, truncate is a DDL operation; therefore, deleting the entire table's

TRUNCATE table deletes all rows in a table without recording a single row delete operation. GrammarTRUNCATE TABLE name;ParametersName (the names of the tables you want to truncate or the names of the tables whose rows you want to delete)TRUNCATE table is functionally the same as a DELETE statement without a WHERE clause: Both delete all rows in the table. Howeve

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 procedures/functions that depend on the table are preserved, but become invalid states. The code is as follows Copy Code Truncate is a stat

Tags: from delete SQL statement PAC Database operation table Apple Div convertFirst, syntax in SQL 1, drop TableNBSP; table name eg:drop table dbo. Sys_test 2, truncate tableNBSP; Table name eg:truncate table dbo. sys_test 3, delete from table name NBSP; where Column name = value eg:delete from dbo. Sys_test where test= ' Test ' Second, Drop,truncate,delete difference 1, Drop (delete

The similarities and differences between truncate, delete, and drop are as follows: 1. truncate and delete without the where clause delete and drop both delete the data in the table. Differences: 1. truncate and delete only delete data, and do not delete the table structure (Definition). The drop statement will delete the table structure as dependent on constrain

Misunderstanding #19: operations on the Truncate table will not be loggedErrorOperations in the User table are recorded in logs. The only operation in SQL Server that is not logged is row Version Control in TempDB.The Truncate Table statement deletes all data in the entire Table. However, the deletion method is not to delete a row, but to release the data page of the table, the process of releasing pages re

Delete refers to the delete statement without the where clause. Delete refers to the delete statement without the where clause. 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

Oracle Big Table cleanup truncate... reuse storage Recently, a large table needs to be cleaned up, which requires no impact on performance. In MySQL, we can minimize I/O by using coreutils and hard links. Oracle can also minimize I/O by recycling space in batches. What is the problem. 1. truncate table syntaxTruncate table [schema_name.] table_name[Preserve materialized view log | purge materialized view lo

MySQL deletes data using the Delete and Truncate statements to compare the content of a bitsCN.com empty mysqll table. There are two common methods: one is delete and the other is truncate. The delete statement without the where parameter can delete all content in the mysql table. you can also use the truncate table to clear all content in the mysql table. In ter

Many systems only perform a flag when performing the delete operation, and do not perform operations that are as expensive as setting the disk to 0. The same is true for truncate. Only the segmentheader and I-node tables are changed. Truncate generates redo, which is generated by modifying the data dictionary, rather than deleting the data. Truncate reduces HWM,

Smarty Truncate intercept string//In SQL Truncate is delete table (truncate is delete content only, deletedeletes completely )Intercepts a length of characters from the beginning of a string, with a default length of 80Specifies the length of the second argument as the Intercept stringBy default, Smarty is truncated to the end of a word,If the exact number of cha