What is the wrong with this SQL query?

SELECT Id, to_date(OrderDate,’YYYY’) AS OrderYear
FROM Order
WHERE OrderYear >= 2015;

In the above query, OrderYear is an alias for to_date(OrderDate,’YYYY’) in SELECT clause.

When we are using OrderYear in WHERE clause, it is not available there.

Following is correct query:

SELECT Id, YEAR(OrderDate) AS OrderYear
FROM Order
WHERE YEAR(OrderDate) >= 2015;

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