sql - Oracle 10g Float format -

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How can I return the float / decimal value with the following: 

  SELECT 210 FROM DUAL

... To get: 

  210.00

... instead of < Code> 210 ?

pl / sql oracle 10g 

 select  TO_CHAR (210 , '99 9. 9 ') with double;

More to_char related formats.


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