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Detecting all distinct characters used in all records of a column present in an Oracle table

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Last Modified: 2013-12-19
Please, could you help me to write a stored function that, acting on a COLUMN, will give in output the different characters contained in every record with reference to that column.

In example:

If you have the table PIPPO containing the column ALPHA with these values:

ABCDE
FGHIJ
KLMNOABCDE
FGHIJ44433
1234567

... launching the SELECT:

SELECT MAGIC_FUNCTION (ALPHA) from PIPPO;

... will produce:

1234567ABCDEFGHIJKLMNO
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