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How to calculate the unique number of a column through the memory array?

I tried to use the following code to find this result.

 

Does the expert have a faster method?

 

Thanks!

Scripting回复： 如何通过内存数组计算出某列的不重复个数？

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
ar = dt << GetAsMatrix( 2 );
nn = Matrix( Associative Array( ar[0, 1] ) << getKeys );
rh = N Row( nn );

Reply: How to calculate the unique number of a column through the memory array?

Thanks for the help of the experts. Although this answer is not what I want.