sql - How do I select rows that have a column value equal to the value of the known row? -


एक मेज है: 

  तालिका तालिका 1 (आईडी पूर्णांक प्राथमिक कुंजी, user_id varchar (36), फ़ील्ड 1 varchar (100))

मैं उपयोगकर्ता से जुड़े पंक्तियों का चयन कैसे करूं, जिसके साथ एक विशिष्ट आईडी के साथ पंक्ति संबंधित है। मैं पंक्तियों को देखने में सक्षम होना चाहता हूं, आईडी के आधार पर एक संदेश चुनें और एक ही उपयोगकर्ता से जुड़े सभी पंक्तियों का चयन करें। 

  चुनें तालिका से * जहां user_id = - उदाहरण के लिए आईडी = 3 के साथ पंक्ति के समान

यह बहुत आसान है, दस्तावेज में विशेष रूप से: 

  SELECT * table1 WHERE user_id = (SELECT user_id से तालिका 1 WHERE id = 3)

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