How to auto increment a NUMBER(10) datatype

Anyone know the syntax on how to auto increment a number field every time a new row comes in?
TIA
CREATE TABLE loc_color_group_values(
     ID number(10) NOT NULL auto_increment, <----------------
     COLOR_CODE_ID number(10) default 0,
     PROD_LOC_ID number(10) default 0,
     COLOR_GROUP_CODE_ID number(10) default 0,
     PRIMARY KEY(ID)
);

Here is an example:
CREATE OR REPLACE TRIGGER "EXAMPLE_TRIG" BEFORE
INSERT ON "loc_color_group_values" FOR EACH ROW BEGIN
  IF :NEW.id IS NULL THEN
    SELECT loc_color_group_values_seq.nextval INTO :NEW.id FROM dual ;
  END IF;
END ;This allows you to overide the sequence without having to disable the trigger.

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