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Posted on 7/5/2021 9:52:38 AM | | |
select * from t where b not in (select distinct b from t) What does it mean to solve online  





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Posted on 7/5/2021 10:36:59 AM |
The result of this implementation will not always be empty
Posted on 7/6/2021 9:28:18 AM |
1. Query the deduplicated field B data of the t table to obtain (Result 1)  
2. Query all field data in table t When field b is not in (Result 1), obtain (Result 2)
Final result: (Outcome 2) No data
Example:
T-table
id     b
1      1
1      5
2      2
3      3
4      3
(Outcome 1): 1, 2, 3, 5

(Result 2): Empty
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