If I have a table,
Name VARCHAR(100)
L DOUBLE
a DOUBLE
b DOUBLE
and execute the incredible
SELECT * FROM Colors WHERE
SQRT(
SQ(
ABS( L - 45.5 )
) +
SQ(
ABS( a - 13.2 )
) +
SQ(
ABS( b + 23.4 )
)
) < 2.5 ;
Could MySQL benefit in any way by indexing the L,a,b fields? Or will it just
plough through all the records one by one, anyway?
Niclas
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