Cannot validate - check constraint violated
启用检查约束失败，因为现有数据违反了约束条件。
SELECT * FROM <table> WHERE NOT (<check_condition>);
SELECT constraint_name, search_condition FROM dba_constraints WHERE table_name = '<TABLE>' AND constraint_type = 'C';
「约束」在课程 Day 81-90 中有 10 篇完整实战教程