Using MAX() in VARCHAR Field

Question

I have a table with following set of data

ID (VARCHAR2 field)
D001
D002
D010
D0012

I use max() in this field.

Sele         


        

Answer 1

SELECT * FROM <TABLE_NAME> ORDER BY CAST( ID AS DECIMAL( 10, 3 ) ) DESC

Answer 2

below code is working for me as per your expectation

select max(to_number(regexp_substr(id, '\d+'))) id from <yourtable>;

Answer 3

This will surely work.

    select MAX(CAST(REPLACE(REPLACE(ID, 'D', ''), '', '') as int)) from <table-name>

Answer 4

First Varchar need to Casted as int to select as MAX. Use below query:

select max(CAST(ID as signed)) as max_id from <table-name>;

Answer 5

You get D010 because alphabetically, D010 comes after D0012 or said another way, D01 comes after D00 and therefore anything that is D01x comes after anything that starts D00x.

Answer 6

this should work

Select MAX(ID) from table where IsNumeric(ID) = 1 ;