In Oracle, you can use the GROUP BY clause with the MAX() function to group the result set by one or more columns and return the maximum value of a date column for each group.
For example, if you have a table called "ORDERS" with columns "CUSTOMER_ID", "ORDER_DATE", and "AMOUNT", you can use the following query to group the orders by customer and return the most recent order date for each customer:
SELECT CUSTOMER_ID, MAX(ORDER_DATE) as MOST_RECENT_ORDER
FROM ORDERS
GROUP BY CUSTOMER_ID;
This query will return the most recent order date for each customer, it will group the orders by customer_id, and for each group, it will return the maximum order_date using the MAX() function.
You can also use the GROUP BY clause with multiple columns and the MAX() function with multiple columns. For example, if you want to group the orders by customer and by order date and return the maximum amount for each group, you can use the following query:
SELECT CUSTOMER_ID, ORDER_DATE, MAX(AMOUNT) as MAX_AMOUNT
FROM ORDERS
GROUP BY CUSTOMER_ID, ORDER_DATE;
This query will group the orders by customer_id and order_date, and for each group, it will return the maximum amount using the MAX() function.
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