Hi @Prateek Punj ,
Thank you for posting query in Microsoft Q&A Platform.
We should consider parameterizing database name in linked service and dynamically pass value to that parameter to point to desired DB. Comma separated values will not help. Also note at a given time your linked service can point to only on DB which supplied as value to parameter.
Please check below video which helps.
Parameterize Linked Services in Azure Data Factory
Hope this helps. Please let us know if any further queries.
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