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Starting from version 1.1 for Jira 4.x and from 2.1 for Jira 5.x, the plugin includes also a new custom field type: Data Table Custom Field, that displays information from a configured data source (a database or a SIL script) in a tabular fashion.
From version 1.1.4 / 2.1.4 you can select multiple values from database in the select list, as well as in autocomplete (Jira style).