Oracle/PLSQL: Lpad and Rpad Function

Oracle/PLSQL: Lpad Function：
http://www.techonthenet.com/oracle/functions/lpad.php

RPAD and LPAD [Oracle SQL]：
http://www.adp-gmbh.ch/ora/sql/rpad.html

引用

In Oracle/PLSQL, the lpad function pads the left-side of a string with a specific set of characters.

The syntax for the lpad function is:

lpad( string1, padded_length, [ pad_string ] )

string1 is the string to pad characters to (the left-hand side).

padded_length is the number of characters to return. If the padded_length is smaller than the original string, the lpad function will truncate the string to the size of padded_length.

pad_string is optional. This is the string that will be padded to the left-hand side of string1. If this parameter is omitted, the lpad function will pad spaces to the left-side of string1.


Applies To:

Oracle 8i, Oracle 9i, Oracle 10g, Oracle 11g

For example:

lpad('tech', 7); would return '   tech'
lpad('tech', 2); would return 'te'
lpad('tech', 8, '0'); would return '0000tech'
lpad('tech on the net', 15, 'z'); would return 'tech on the net'
lpad('tech on the net', 16, 'z'); would return 'ztech on the net'