sql loader - check for specific field value

Question

I have a field called "FLOATVALUE" in csv/text file. I receive this file from third party, this has below possible values

1. NULL
2. {}
3. Any number

When I insert this value as below

.... [OTHER FIELD CHECKS]

isValid "nvl(:isValid, '')",

FLOATVALUE FLOAT EXTERNAL "nvl(:FLOATVALUE, NULL)"

.... [OTHER FIELD CHECKS]

Its checking whethre ":FLOATVALUES" is null or not. If yes it's inserting NULL into the oracle table, if not it's failing to insert for the values ("{}").

The field I'm loading into oracle table is 'FLOATVALUE FLOAT'. I would like to have something like below in my control file -

1. if :FLOATVALUE is null insert NULL
   elseif :FLOATVALUE is '{}' insert NULL
   else inert original value

How can specify a condition like above in control file?

Answer 1

You can use the decode function:

decode(:FLOATVALUE, '{}', NULL, :FLOATVALUE)

That says: if FLOATVALUE is '{}', insert NULL, otherwise insert FLOATVALUE

Answer 2

You can use either decode or case when statement. See the example below

Decode :
decode(Float_value,{},NULL,Float_value);

Case when :
CASE  [ FLOAT_VALUE ]
WHEN NULL THEN NULL
WHEN {} THEN NULL
ELSE [FLOAT_VALUE]
END;