What is truncate in Plsql?

What is truncate in Plsql?

Description. The TRUNCATE TABLE statement is used to remove all records from a table in Oracle. It performs the same function as a DELETE statement without a WHERE clause. Warning: If you truncate a table, the TRUNCATE TABLE statement can not be rolled back.

What is truncate in Oracle SQL?

When you truncate a table, Oracle Database automatically removes all data in the table’s indexes and any materialized view direct-path INSERT information held in association with the table. This information is independent of any materialized view log.

What are the types of cursor in PL SQL?

PL/SQL has two types of cursors: implicit cursors and explicit cursors.

What is tOracleInput in Talend?

Function. tOracleInput reads a database and extracts fields based on a query. Purpose. tOracleInput executes a DB query with a strictly defined order which must correspond to the schema definition. Then it passes on the field list to the next component via a Main row link.

How do you truncate in SQL?

To remove all data from an existing table, use the SQL TRUNCATE TABLE order. You can also use the DROP TABLE command to delete an entire table. But Truncate will remove the entire table structure from the database, and you will need to recreate the table if you want to store any data.

What are PL SQL cursor exceptions?

An exception is an error condition during a program execution. PL/SQL supports programmers to catch such conditions using EXCEPTION block in the program and an appropriate action is taken against the error condition. There are two types of exceptions − System-defined exceptions.

What is cursor types of cursor and diff b W cursors?

Implicit cursors are automatically created when select statements are executed. Explicit cursors needs to be defined explicitly by the user by providing a name. They are capable of fetching a single row at a time. Explicit cursors can fetch multiple rows.

How many types of cursors are there in SQL?

Type of Cursors. SQL Server supports four cursor types.

What is cursor and types of cursor in Oracle?

To execute a multi-row query, Oracle opens an unnamed work area that stores processing information. A cursor lets you name the work area, access the information, and process the rows individually. For more information, see “Querying Data with PL/SQL”.