I am trying to figure out a format spec of to_char() that would give me the following result.
to_char(0.1, '[FORMAT_SPEC]')
gives 0.1 and:
to_char(1, '[FORMAT_SPEC]')
gives 1.
I've tried the following solutions:
to_char(0.1)
gives '.1'.
to_char(0.1, 'FM0.099')
gives 0.1, which is okay, however:
to_char(1, 'FM0.099')
gives 1.0, which is not okay.
Do you have any suggestions?
The precision returned needs to be consistent, so the only alternative is to use DECODE or CASE statements to conditionally return what you need:
CASE
WHEN INSTR(TO_CHAR(t.col), '.') = 0 THEN TO_CHAR(t.col)
ELSE TO_CHAR(t.col, 'FM0.099')
END
The example isn't great - it's not clear if your data will have values like 1.000
or values above one/etc.
EDIT Michael-O (2013-06-25): For those who need it idiot-proof, you may try:
case
when instr(to_char(<col>), (select to_char(0, 'FMD') from dual)) = 0
then to_char(<col>)
else to_char(<col>, 'FM999990D999')
end
It automatically observes the decimal separator. Adapt the the secodn format modal to your number size.
我只是用这个:
TRIM('.' FROM TO_CHAR(x, 'FM99990.999'))
Don't happen to have an Oracle instance handy to test this in, but I'd think that
TO_CHAR(1, 'FM0.999')
oughta do it.
Not sure what range of values you will be expecting but you could case out values < 1 versus those >= 1. Otherwise either the trailing 0 or the decimal is going to get in your way:
select val,
case when val < 1 then to_char(val, 'FM99990.9')
else to_char(val, 'FM99999')
end fmt
from (select 0.1 val from dual union all
select 1 from dual
)
/
VAL FMT
---------- --------
.1 0.1
1 1
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