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Oracle/PLSQL: LENGTH Function

Learn how to use the Oracle/PLSQL LENGTH function with syntax and examples.


The Oracle/PLSQL LENGTH function returns the length of the specified string.


The syntax for the Oracle/PLSQL LENGTH function is:

LENGTH( string1 )

Parameters or Arguments

string1 is the string to return the length for.


  • If string1 is NULL, then the LENGTH function will return NULL.

Applies To

The LENGTH function can be used in the following versions of Oracle/PLSQL:

  • Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i


Let's look at some Oracle LENGTH function examples and explore how to use the LENGTH function in Oracle/PLSQL.

For example:

LENGTH(NULL) would return NULL
LENGTH('') would return NULL
LENGTH(' ') would return 1
LENGTH('Tech on the Net') would return 15
LENGTH('Tech on the Net ') would return 16