Oracle查詢字段中有爲null的須要格外注意

今天須要去數據庫取一些數據sql SELECT * FROM T_JC_TEACHER_INFO WHERE SCHOOL_CODE ='xxxxx' AND TEACHER_TYPE = '專任教師' AND AUDIT_STATE = '2' AND ATTACHED_CLASS_TYPE IS NULL 查出的數據大概以下 能夠看到ABNORMAL_TYPE_GROUP字段有兩種值【減

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