mysql - Nested Select Select -

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यह पिछले प्रश्न का एक अंश है - मेरे पास ऐसा कोड है जो 

  कर्मचारी EMPLOYEE_NAME, HIRE_DATE, IFNULL (वेतन, 0), प्रबंधक_id का चयन करें, (कर्मचारी संख्या से "अज्ञात" कर्मचारी चुनें, जहां b.employee_id = a.manager_id) कर्मचारी द्वारा किसी आदेश द्वारा .EMPLOYEE_NAME;   
 मुझे दिखाई देने वाला शब्द "अज्ञात" होना चाहिए, यदि कोई प्रबंधक मूल्य नहीं है  
 असल में यह कर्मचारी आईडी और प्रबंधक आईडी के साथ बड़ी तालिका है। (और प्रबंधक आईडी कर्मचारी आईडी के बराबर हैं) इसलिए मैं उन लोगों की सूची प्राप्त कर सकता हूं जो ठीक से जुड़ते हैं लेकिन रिक्त स्थान रिक्त हो जाते हैं ... कृपया सलाह दें।   
 
 
  चुनें EMPLOYEE_NAME, HIRE_DATE, कोलाज़ (वेतन, 0), प्रबंधक_आईडी, कोलासेस (बी। कर्मचारी_नाम, 'अज्ञात') कर्मचारी से प्रबंधक_नाम के रूप में एक .EMPLOYEE_NAME द्वारा b.employee_id = a.manager_id आदेश पर एक खड़े कर्मचारी से जुड़ जाता है;

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