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SELECT COUNT(*) FROM planets
WHERE ROUND(SQRT(POWER(('71' - coords_x), 2) +
POWER(('97' - coords_y), 2))) <= 17
==> 51
SELECT COUNT(*) FROM planets
WHERE ROUND(SQRT(POWER((71 - coords_x), 2) +
POWER((97 - coords_y), 2))) <= 17
==> 22
coords_x and coords_y are both TINYINT fields containing values in the range [1, 100]. Usually MySQL doesn’t care if numbers are quoted or not.. but apparently it does in this case. The question is: Why?
The implicit conversion from string to floating point number is probably causing in inaccurate results. See: Type Conversion in Expression Evaluation