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SQL> desc customers; Name Null? Type ----------------------------------------- -------- ---------------------------- TID NOT NULL NUMBER COM_NUM VARCHAR2(4000) COM_NAME NOT NULL VARCHAR2(4000) COM_ADDRESS VARCHAR2(4000) COM_TEL VARCHAR2(4000) COM_FAX VARCHAR2(4000) COM_CONTACT VARCHAR2(4000) COM_MOBILE VARCHAR2(4000) COM_COUNTRY VARCHAR2(4000) COM_BRANCH NOT NULL NVARCHAR2(1) COM_SALE_ID NUMBER COM_TRANSPORT_ID NUMBER COM_PAYMENT_DAY NOT NULL NUMBER COM_HEADER_NAME VARCHAR2(4000) COM_DISABLED NOT NULL NVARCHAR2(2000) COM_BALANCE NOT NULL NUMBER(12,2) COM_AREA VARCHAR2(255) SQL> desc customer_branch Name Null? Type ----------------------------------------- -------- ---------------------------- TID NOT NULL NUMBER COM_ID NOT NULL NUMBER BRANCH_ADDRESS VARCHAR2(4000) BRANCH_CONTACT VARCHAR2(4000) BRANCH_TEL VARCHAR2(4000) BRANCH_FAX VARCHAR2(4000)