(4)数据库----关系代数指令习题练习

Find the names of all customers who have a loan, an account, or both, from the bank Π c u s t o m e r n a m e ​ ( b o r r o w e r ) ∪ Π c u s t o m e r n a m e ​ ( d e p o s i t o r ) Π customer_name

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