MySQL : Laravel SQLSTATE[HY000] [1049] Unknown database 'previous_db_name'

MySQL : Laravel SQLSTATE[HY000] [1049] Unknown database 'previous_db_name'
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MySQL : Laravel SQLSTATE[HY000] [1049] Unknown database 'previous_db_name'
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'previous_db_name' [1049] Unknown Laravel database MySQL : SQLSTATE[HY000]