Check out example codes for "sql order by where condition". It will help you in understanding the concepts better.

Code Example 1

SELECT ProcductCode AS Id, ProductPrice AS Price
FROM Products WITH (NOLOCK)
WHERE ProductCode IN ('efg', 'abc', 'xyz')
ORDER BY (CASE WHEN ProductCode = 'efg' THEN 1
               WHEN ProductCode = 'abc' THEN 2
               WHEN ProductCode = 'xyz' THEN 3
               ELSE 4  -- in case you change the `where`, put them last
          END);

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