Let's look at the code JOIN MERGEJOIN (inputs presorted) [Cost: 750, Rows: 1200] (PATH ID:1). What does the number 750 represent? A. The total cost of sales items in this joined dataset The exact known cost of the query runtime C. The estimation cost
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The cost number in an EXPLAIN query is arbitrary. It allows you to compare different parts a query to identify the most computationally intensive.
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