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Teradata DELETE statement deletes records from the Teradata table. With the help of the delete command, either the entire data or the specific record can be deleted.
You require DELETE privileges on the table for executing the DELETE statement and if you using execute the DELETE statement with the WHERE condition then you required SELECT privileges on all tables and views through which they are referenced.
Teradata Delete Statement syntax
The syntax for deleting all the records is as below.
DELETE FROM database_name.table_name;
The syntax for deleting specific records is as follows.
DELETE FROM database_name.table_name where condition;
Parameters Explanation
| Parameter |
Explanation |
| database_name |
The name of the owner database for the table. |
| table_name |
The name of the table from where you want to delete all the records. |
| where condition |
The condition for deleting specific row(s). |
Teradata Delete Statement example
To understand the concept of the Teradata DELETE statement, we will use the below Employee table.
Definition of Employee table
SHOW TABLE TUTORIALSBOOK.Employee;
CREATE SET TABLE TUTORIALSBOOK.Employee ,FALLBACK ,
NO BEFORE JOURNAL,
NO AFTER JOURNAL,
CHECKSUM = DEFAULT,
DEFAULT MERGEBLOCKRATIO,
MAP = TD_MAP1
(
EMPNO INTEGER NOT NULL,
FIRST_NAME CHAR(25) CHARACTER SET LATIN NOT CASESPECIFIC NOT NULL,
LAST_NAME CHAR(25) CHARACTER SET LATIN NOT CASESPECIFIC,
HIREDATE DATE FORMAT 'YYYY-MM-DD' NOT NULL,
DESIGNATION VARCHAR(20) CHARACTER SET LATIN NOT CASESPECIFIC,
SALARY DECIMAL(8,2),
DEPTNO INTEGER)
UNIQUE PRIMARY INDEX ( EMPNO );
Table: Employee
EMPNO FIRST_NAME LAST_NAME HIREDATE DESIGNATION SALARY DEPTNO
----------- ------------------------- ------------------------- ---------- -------------------- ---------- -----------
1001 STEFAN SALVATORE 2001-04-12 BUSINESS ANALYST 55000.00 40
1002 DIANA LORANCE 2005-01-05 TECHNICAL ARCHITECT 75000.00 10
1003 JAMES MADISON 2005-09-18 MANAGER 60000.00 20
1004 JONES NICK 2004-08-19 HR ANALYST 35000.00 30
1005 LUCY GILLER 2006-04-01 HR ASSOCIATE 30000.00 30
1006 ISSAC STEFAN 2002-11-18 TRAINEE 22000.00 10
1007 NANCY GILBERT 2003-04-06 CLERK 18000.00 10
1008 JOHN SMITH 2005-10-12 SALESMAN 20000.00 10
1) Delete specific records from a table
The below example shows how to delete specific records from a table.
DELETE FROM TUTORIALSBOOK.Employee
WHERE DESIGNATION='SALESMAN';
The above statement deletes records of the employee whose DESIGNATION is SALESMAN.
DELETE FROM TUTORIALSBOOK.Employee
WHERE DESIGNATION='SALESMAN';
*** Delete completed. One row removed.
*** Total elapsed time was 1 second.
The same can be verified using the select statement using with where condition.
SELECT * FROM TUTORIALSBOOK.Employee
WHERE DESIGNATION='SALESMAN';
*** Query completed. No rows found.
*** Total elapsed time was 1 second.
2) Delete all records from a table
The below statement deletes all the records from the table Employee. However, the table structure will not be deleted.
DELETE FROM TUTORIALSBOOK.Employee;
*** Delete completed. 7 rows removed.
*** Total elapsed time was 1 second.
The same can be verified using the select statement.
SELECT * FROM TUTORIALSBOOK.Employee;
*** Query completed. No rows found.
*** Total elapsed time was 1 second.