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What is difference between TRUNCATE and DELETE statement
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Answer Posted / nadiya
TRUNCATE DELETE DIFFERENCE
Truncate command will delete all records and the most
important thing to make note of
truncate command is since truncate command cannot be rolled
back one must make
sure to take proper backup of table data before performing
the truncate command.
Truncate command is thus used to remove all rows from
either a table or a cluster.
If one wants to use the truncatecommand in a cluster they
can use
it only in an indexed cluster and not in a hash cluster.
Though the functionality of delete and truncate looks on
the outward same
the main differences between truncate and delete statements
are
truncate is a DDL statement whereas
delete is a DML statement.
Truncate command cannot be rolled back but
delete command can be rolled back.
As a result, as explained
before truncate command is faster than delete command.
Another main difference between delete andtruncate command
is
delete command can be used with a where clause to delete
specific rows from a table.
If the where clause is not specified in a delete
statement,
all rows are deleted from the table.
Thus delete command can be used to delete specific or all
rows from a table.
But truncate command deletes all rows from the table.
The general syntax of truncate command is
TRUNCATE TABLE tablename;
For instance if one wished to truncate a table named as
exforsys
it is done by using the command as follows:
TRUNCATE TABLE exforsys;
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