说明: 5、 建立表BRANCHxxx, CUSTOMERxxx, LOANxxx, BORROWERxxx, ACCOUNTxxx, DEPOSITORxxx; CREATE TABLE ACCOUNTxxx ( account_number char(10), branch_name char(30) NOT NULL, balance numeric(12.2), PRIMARY KEY (account_number), FOREIGN KEY (branch_name) REFERENCES
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