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They are not the same thing.
Consider these queries:
SELECT *FROM OrdersLEFT JOIN OrderLines ON OrderLines.OrderID=Orders.IDWHERE Orders.ID = 12345and
SELECT *FROM OrdersLEFT JOIN OrderLines ON OrderLines.OrderID=Orders.IDAND Orders.ID = 12345The first will return an order and its lines, if any, for order number 12345. The second will return all orders, but only order 12345 will have any lines associated with it.
With an INNER JOIN, the clauses are effectively equivalent. However, just because they are functionally the same, in that they produce t...
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