Oracle / PLSQL: EMPTY_CLOB Function
This Oracle tutorial explains how to use the Oracle/PLSQL EMPTY_CLOB function with syntax and examples.
Description
The Oracle/PLSQL EMPTY_CLOB function can be used to initialize a LOB column to EMPTY in an INSERT statement or UPDATE statement or it can be used initalize a LOB variable.
Syntax
The syntax for the EMPTY_CLOB function in Oracle/PLSQL is:
EMPTY_CLOB ()
Parameters or Arguments
There are no parameters or arguments for the EMPTY_CLOB function.
Returns
The EMPTY_CLOB function returns an empty LOB locator.
Applies To
The EMPTY_CLOB function can be used in the following versions of Oracle/PLSQL:
- Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i
Example
Let's look at some Oracle EMPTY_CLOB function examples and explore how to use the EMPTY_CLOB function in Oracle/PLSQL.
For example:
UPDATE customers SET customer_photo = EMPTY_CLOB();
This EMPTY_CLOB example would initialize the customer_photo column to EMPTY. This is different than setting the column to a null LOB or a LOB with a string length of 0.
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