| Oracle® Database SQL Reference 10g Release 2 (10.2) Part Number B14200-02 |
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Syntax

Purpose
NLS_LOWER returns char, with all letters lowercase.
Both char and 'nlsparam' can be any of the datatypes CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB. The string returned is of VARCHAR2 datatype if char is a character datatype and a LOB if char is a LOB datatype. The return string is in the same character set as char.
The 'nlsparam' can have the same form and serve the same purpose as in the NLS_INITCAP function.
Examples
The following statement returns the character string 'citta'' using the XGerman linguistic sort sequence:
SELECT NLS_LOWER
('CITTA''', 'NLS_SORT = XGerman') "Lowercase"
FROM DUAL;
Lowerc
------
citta'