sql - Query to retrieve groups where all related values are null -

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मेरे पास निम्न है: 

  | समूह_आईडी | मूल्य | | ---------- | ------- | | 146 | ए | | 146 | बी | | 23 9 | नल | | 23 9 | एफ | | 826 | नल | | 826 | नल |   
 
 मुझे केवल उन आईडी को पुनर्प्राप्त करने की ज़रूरत है जिनके सभी संबंधित मान नल हैं। इस उदाहरण में, आउटपुट  826  होगा।  
 मुझे पता है कि यह एक साधारण प्रश्न है, लेकिन मैं इसके साथ एक लंबे समय से संघर्ष कर रहा हूं।   
 
 <समूह> समूह समूह को योग से समूह_आईड चुनें (यदि मान शून्य है तो 1 अंत) = गणना (*)

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