Partition Help

Hi,

I am trying to setup partitions and as a test, I was able to follow the
example in the Postgres docs using the date as a condition.

Now I am trying to partition on a column with the data type character
varying. I want to partition based on an invoice ID consisting on letters
and numbers like I-10, I-11. I create my function:

IF ('invoice' <= 'I-10000') THEN INSERT INTO myschema.mywork VALUES (NEW.*)
ELSE IF ('invoice' >= 'I-10001' AND <= 'I-20000') THEN INSERT INTO
myschema.mywork VALUES (NEW.*)

ELSE RAISE EXCEPTION...

Is it possible to perform this type of operation with a mix of letters and
numbers? So far any attempts to insert based on these conditions raises the
exception.

Thanks.

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