Do I need this index?

I have a table defined as:

CREATE TABLE FOLDERENVELOPES(
  FOLDERID INTEGER Not Null,
  ENVELOPEID INTEGER Not Null,
  CONSTRAINT PK_FOLDERENVELOPES PRIMARY KEY ( FOLDERID, ENVELOPEID ) );

CREATE INDEX IX_FOLDERFOLDERCID ON FOLDERENVELOPES( FOLDERID ); CREATE INDEX IX_FOLDERENVELOPECID ON FOLDERENVELOPES( ENVELOPEID ); The table may have several hundred thousand rows.

As the primary key may used for indexed access via both FOLDERID and {FOLDERID, ENVELOPEID}, is there any value to IX_FOLDERFOLDERCID ?

Thx

• Jim