在查询中多次选择

Question

I have the following basic query which I need tweaked:

SELECT PRODUCT_KEY,
       PRODUCT_DESCRIPTION,
       USC_CODE,
       USC_DESCRIPTION
FROM ADMIN.PRODUCT_DIM
WHERE COUNTRY_CODE = 'US'
    AND usc_code IS NOT NULL
GROUP BY PRODUCT_KEY,
         PRODUCT_DESCRIPTION,
         USC_CODE,
         USC_DESCRIPTION
ORDER BY PRODUCT_KEY

What I need to list any of the select fields only if the there are 1 or none product_keys within usc_code .

So if usc 12345 has zero or 1 product only I want to see that usc, product, desc, etc. out of it.

So I'm thinking I need another select in the middle somewhere but not sure where.

Here's some sample data:

PRODUCT_KEY PRODUCT_DESCRIPTION     USC_CODE USC_DESCRIPTION
1000376001  B COMPLEX/C         76222    B-COMPLEX,W/C,ORAL
1000610001  OXYMETAZOLINE HCL   14200    DECONGESTANTS ALONE
1000611001  OXYMETAZOLINE HCL   14200    DECONGESTANTS ALONE
1000612001  OXYMETAZOLINE HCL   14200    DECONGESTANTS ALONE
1000613001  OXYMETAZOLINE HCL   14200    DECONGESTANTS ALONE
1000614001  OXYMETAZOLINE HCL   14200    DECONGESTANTS ALONE
1000615001  OXYMETAZOLINE HCL   78120    CRUDE/BULK MED

Answer 1

SELECT PRODUCT_KEY, PRODUCT_DESCRIPTION, USC_CODE, USC_DESCRIPTION, COUNT(*)
FROM ADMIN.PRODUCT_DIM
WHERE COUNTRY_CODE = 'US'
   AND usc_code is not null
GROUP BY PRODUCT_KEY, PRODUCT_DESCRIPTION, USC_CODE, USC_DESCRIPTION
HAVING COUNT(*) = 0 OR COUNT(*) = 1
ORDER BY PRODUCT_KEY

Answer 2

Try this one

SELECT PRODUCT_KEY, PRODUCT_DESCRIPTION, USC_CODE, USC_DESCRIPTION 

FROM ADMIN.PRODUCT_DIM

WHERE COUNTRY_CODE = 'US'
and usc_code is not null

Group By PRODUCT_KEY, PRODUCT_DESCRIPTION, USC_CODE, USC_DESCRIPTION
HAVING COUNT (PRODUCT_KEY) <2
Order by PRODUCT_KEY