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non-unique index on unique constraint column

原文 2014-06-26 13:35:45 2 1 sql/ sql-server-2008/ indexing

I have a table which a unique constraint on a column. This column also has a non-unique clustered index. This column is not the primary key.

are there any issues around this? I can't find any information about this combination.

cheers,

1 answers

The non-clustered index is redundant assuming that it really is just on that column and nothing else. A unique constraint is implemented using a unique NCI.

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Related Question Create a unique index on a non-unique column Unique constraint violated when I have a non-unique index Unique vs non-unique index SQL Server Clustered Index on Non-Unique Column Foreign key on a non-unique index? (oracle) MySQL database join on non-unique index CREATE TABLE query with non-unique Index SQL Count occurrences of non-unique column Select and count attribute for non-unique column Should I begin a MySQL index with unique or non-unique field?

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non-unique index on unique constraint column

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solution1 1 ACCPTED 2014-06-26 13:37:01

solution1
1 ACCPTED 2014-06-26 13:37:01