Use this box to specify additional columns to be included in the index but not as part of the unique index key. These columns may improve the performance of some queries through index-only access. The columns must be distinct from the columns used to enforce uniqueness.
To add a column name to this box, select it from the Available columns list box and select the > push button.
You can specify up to 16 columns. The sum of the length attributes of the specified columns must not be greater than 255 bytes.
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