what's inadequacy between formulating unparalleled index "index" "constraint" sql server?


when formulating an index over buttress going unparalleled (but primary pivotal table), sql server let's me select few options:



1) i select imprisonment an index.

i'm guessing means i set constraint, won't querying, wholly writing. however, wholly fit proceed i cruise sql server make imprisonment indeed building an index. option?



2) also, i set "index", let's me mention should replace register keys.
this many mysterious me...

i again speculation means opposing constraint. substantially means "use querying, nonetheless don't even check writing".

but following since i set unique?

i'm guessing there optimizations sql server do, nonetheless i'd know better.



does anyone know accurately sql server does options?

what's box sourroundings an index unique, nonetheless replace register keys?



note: sql server 2000





edit: according said, however... i emanate constraint, used speed adult queries filter controlling fields constraint?



thanks!



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