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constrain -> constraint #1557

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2 changes: 1 addition & 1 deletion source/core/index-sparse.txt
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Expand Up @@ -93,7 +93,7 @@ Consider a collection ``scores`` that contains the following documents:
{ "_id" : ObjectId("523b6e61fb408eea0eec2648"), "userid" : "abby", "score" : 82 }
{ "_id" : ObjectId("523b6e6ffb408eea0eec2649"), "userid" : "nina", "score" : 90 }

You could create an index with a :ref:`unique constrain
You could create an index with a :ref:`unique constraint
<index-type-unique>` and sparse filter on the ``score`` field using
the following operation:

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