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Oracle SUBSTR function
The Oracle/PLSQL SUBSTR function allows extracting a substring from a string.
Syntax of the Oracle/PLSQL SUBSTR function
SUBSTR( string_id, start_position_id, [ length_id ] )
Parameters and function arguments
- string_id – source line.
- start_position_id – position to start extraction of substring. The first position in the string is always equal to 1.
- length_id – is not mandatory. Defines the number of characters to be extracted. If this parameter is not specified, the SUBSTR function will return the entire string.
Note:
- If start_position is 0, the SUBSTR function will accept start_position as 1 (i.e.: first position in a string).
- If start_position is a positive number, the SUBSTR function starts reading from the beginning of the line.
- If start_position is a negative number, the SUBSTR function starts from the end of the line and counts in the opposite direction.
- If length is a negative number, the SUBSTR function returns NULL.
The SUBSTR function can be used in the following Oracle/PLSQL versions
| Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i |
Let’s consider some examples of SUBSTR function and learn how to use SUBSTR function in Oracle/PLSQL.
SELECT SUBSTR('This is a test', 6, 2) FROM DUAL;
--Result: is
SELECT SUBSTR('This is a test', 6) FROM DUAL;
--Result: is a test
SELECT SUBSTR ("HowZertIzTabakerky", 1, 3) FROM DUAL;
--Result: How
SELECT SUBSTR ("HowZertIzTabakerky", -15, 4) FROM DUAL;
--Result: Zert
SELECT SUBSTR ("HowZertIzTabakerky", -11, 2) FROM DUAL;
--Result: Iz
SELECT SUBSTR ("HowZertIzTabakerky", -9, 9) FROM DUAL;
--Result: Tabakerky
Oracle Tutorial for Substr and Instr functions
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