In Oracle, how do you use two different functions on the same column?

I am trying to use two different string functions (initcap and trim) on one column and I would like it to display only the one column with both functions 开发者_Python百科applied. In general how do you use two or more functions on a single column?

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In general, you can nest function calls within function calls, evaluated innermost to outermost:

SELECT INITCAP(TRIM(column)) FROM your_table;

As long as each nested function returns a value of a compatible type, you should be able to apply this to any functions.

For example:

SELECT '|' || INITCAP(TRIM('  abc def ghi  jklmn   ')) || '|' str
  FROM dual;

Results in:

STR
--------------------
|Abc Def Ghi  Jklmn|

Note I concatenated the pipe symbol to illustrate the TRIM of the string.

More to the point here:

SELECT '|' || INITCAP(TRIM('.' FROM '... abc def ghi  jklmn...')) || '|' str FROM dual;

Gives me:

STR
----------------------
| Abc Def Ghi  Jklmn|