CREATE TABLE STORE ( STORE_CODE VARCHAR(4) NOT NULL, STORE_NAME VARCHAR(20), REGION VARCHAR(10), STORE_KBN VARCHAR(1), PRIMARY KEY (STORE_CODE) ); CREATE TABLE ITEM ( ITEM_CODE VARCHAR(6) NOT NULL, ITEM_NAME VARCHAR(50), UNIT_PRICE INTEGER, PRIMARY KEY (ITEM_CODE) ); CREATE TABLE SALES ( SALES_NO VARCHAR(10) NOT NULL, SALES_DATE DATE, STORE_CODE VARCHAR(4), ITEM_CODE VARCHAR(6), QUANTITY INTEGER,