| suppl_id | suppl_name | city_id | state_id |
|---|---|---|---|
Dear readers of our blog, we'd like to recommend you to visit the main page of our website, where you can learn about our product SQLS*Plus and its advantages.
SQLS*Plus - best SQL Server command line reporting and automation tool! SQLS*Plus is several orders of magnitude better than SQL Server sqlcmd and osql command line tools.
REQUEST COMPLIMENTARY SQLS*PLUS LICENCE
Enteros UpBeat offers a patented database performance management SaaS platform. It proactively identifies root causes of complex revenue-impacting database performance issues across a growing number of RDBMS, NoSQL, and deep/machine learning database platforms. We support Oracle, SQL Server, IBM DB2, MongoDB, Casandra, MySQL, Amazon Aurora, and other database systems.
TRUNCATE TABLE SQL operator
29 June 2020
TRUNCATE TABLE SQL server statement is used to delete all records from a table. It performs the same function as the DELETE operator, without the WHERE offer.
Warning: when truncating a table, TRUNCATE TABLE cannot be overridden in some databases.
Syntax for TRUNCATE TABLE in SQL
TRUNCATE TABLE tab_name;
where:
- tab_name – The table that you want to truncate
You can truncate a table, not delete it (DROP) and recreate it
The table truncation could be faster and would not affect the different indexes, table dependencies or triggers. However, this method of removing records from a table is also quicker if you do not need a rollback.
Let’s think how the TRUNCATE TABLE operator is used in SQL.
So, in this case, we have a table with the same data:
| suppl_id | suppl_name | city_id | state_id |
|---|---|---|---|
| 100 | Yandex | Moscow | Russian |
| 200 | Lansing | Michigan | |
| 300 | Oracle | Redwood City | California |
| 400 | Bing | Redmond | Washington |
| 500 | Yahoo | Sunnyvale | Washington |
| 600 | DuckDuckGo | Paoli | Pennsylvania |
| 700 | Qwant | Paris | France |
| 800 | Menlo Park | California | |
| 900 | Electronic Arts | San Francisco | California |
Enter the following TRUNCATE TABLE operator.
TRUNCATE TABLE suppls;
Then select the data from the suppls table again.
SELECT *
FROM suppls;
Here are the results you should get.
This example will truncate the supplier table and remove all entries from that table. This would be equivalent to the next DELETE statement in SQL.
DELETE FROM suppls;
Both of these operators will remove all data from the table. The main difference between them is that you can roll back the DELETE operator if you choose, but you cannot roll back the TRUNCATE TABLE command in all SQL databases.
If you need to add a table name prefix to the database name, you can rewrite TRUNCATE TABLE as follows.
TRUNCATE TABLE test.suppls;
This example will truncate the supplier table in the database with the name test.
How to Truncate Table in SQL
MORE NEWS
PreambleNoSql is not a replacement for SQL databases but is a valid alternative for many situations where standard SQL is not the best approach for...
PreambleMongoDB Conditional operators specify a condition to which the value of the document field shall correspond.Comparison Query Operators $eq...
5 Database management trends impacting database administrationIn the realm of database management systems, moreover half (52%) of your competitors feel...
The data type is defined as the type of data that any column or variable can store in MS SQL Server. What is the data type? When you create any table or...
PreambleMS SQL Server is a client-server architecture. MS SQL Server process starts with the client application sending a query.SQL Server accepts,...
First the basics: what is the master/slave?One database server (“master”) responds and can do anything. A lot of other database servers store copies of all...
PreambleAtom Hopper (based on Apache Abdera) for those who may not know is an open-source project sponsored by Rackspace. Today we will figure out how to...
PreambleMongoDB recently introduced its new aggregation structure. This structure provides a simpler solution for calculating aggregated values rather...
FlexibilityOne of the most advertised features of MongoDB is its flexibility. Flexibility, however, is a double-edged sword. More flexibility means more...
PreambleSQLShell is a cross-platform command-line tool for SQL, similar to psql for PostgreSQL or MySQL command-line tool for MySQL.Why use it?If you...
PreambleWriting an application on top of the framework on top of the driver on top of the database is a bit like a game on the phone: you say “insert...
PreambleOracle Coherence is a distributed cache that is functionally comparable with Memcached. In addition to the basic function of the API cache, it...
PreambleIBM pureXML, a proprietary XML database built on a relational mechanism (designed for puns) that offers both relational ( SQL / XML ) and...
What is PostgreSQL array? In PostgreSQL we can define a column as an array of valid data types. The data type can be built-in, custom or enumerated....
PreambleIf you are a Linux sysadmin or developer, there comes a time when you need to manage an Oracle database that can work in your environment.In this...
PreambleStarting with Microsoft SQL Server 2008, by default, the group of local administrators is no longer added to SQL Server administrators during the...