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Transact-SQL Desk Reference
book

Transact-SQL Desk Reference

by Deac Lancaster
November 2003
Intermediate to advanced
816 pages
14h 53m
English
Pearson
Content preview from Transact-SQL Desk Reference

4.4. TRUNCATE TABLE

The TRUNCATE TABLE command removes all rows from a table without logging each row deleted. No logging means it runs faster than DELETE FROM tablename. It also resets IDENTITY column to its initial (seed) value. TRUNCATE TABLE cannot be used on parent table of Foreign Key constraint.

4.4.1. TRUNCATE TABLE Syntax

The syntax of TRUNCATE TABLE and some examples of its use are shown here. In addition, Table 4-3 offers a comparison between DELETE FROM table and TRUNCATE TABLE table.

Syntax
TRUNCATE TABLE tablename
						

Example:

SQL
												SELECT COUNT(*) NumRows FROM products
											
 
Result
NumRows-----------65
SQL
												TRUNCATE TABLE  products
												-- Similar effect to:    DELETE  FROM  products
												-- But not logged and resets IDENTITY.
											
 
Result
The command(s) ...
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Publisher Resources

ISBN: 0130293393Purchase book