SELECT distinct c.CUSTOMER_ID , initcap(C.CUST_FIRST_NAME || ' ' || C.CUST_LAST_NAME) Name, o.ORDER_ID, O.ORDER_TOTAL
FROM DEMO_CUSTOMERS C, DEMO_ORDERS O, DEMO_ORDER_ITEMS I
where C.CUSTOMER_ID = O.CUSTOMER_ID and
I.ORDER_ID = O.ORDER_ID
------------------------------------------------------
* SQL SELECT DISTINCT Statement
In a table, a column may contain many duplicate values; and sometimes you only want to list the different (distinct) values.
The DISTINCT keyword can be used to return only distinct (different) values.
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