在查询中多次选择

Question

我有以下需要调整的基本查询：

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

仅当usc_code有1个或没有product_keys时，我才需要列出任何select字段。

因此，如果usc 12345只有0或1个产品，我希望看到usc，product，desc等。

所以我想我需要在中间某个地方进行另一个选择，但不确定在哪里。

这是一些示例数据：

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

试试这个吧

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