Fix db_heartbeat on Oracle #482
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Oracle doesn't support a
SELECTwithout aFROMstatement in pure SQL. To achieve the same behavior asSELECT 1;in Oracle, simply use Oracle's native dummy table, calledDUAL, i.e., doSELECT 1 FROM DUAL;.https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/Selecting-from-the-DUAL-Table.html
Note: On Oracle 23+, it is now optional to select expressions using the
FROM DUALclausehttps://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/Selecting-from-the-DUAL-Table.html
Fix #481