Run 2 queries depending on date?

How can I combine this into one SQL script?

SELECT DATE, right('00000000' + SP_ID, 
case when right(sp_id,1) > '9' then 9 else 8 end) AS VALUE
FROM WP_CD
WHERE DATE < 06/30/1994

ELSE

SELECT DATE, ISNULL(Sedol, Cusip) AS VALUE
FROM WP_CD

Thanks.

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