How to use union with nextval in SQL

Just think of a situation where we have to use nextval in a SQL query with UNION, but the question here is how?Let’s see with a example:-

select mwreport_seq.nextval as RECORD_ID,inv.DEVICE_ID,inv.DEVICE_NAME,inv.DEVICE_USID, inv.DEVICE_SERIAL_NUM,inv.DEVICE_PORT,inv.DEVICE_VENDOR,inv.DEVICE_TYPE,inv.DEVICE_MODEL,from Device_Demo_table inv
union all
select gdid.DEVICE_ID,gdid.DEVICE_NAME,gdid.DEVICE_USID,
gdid.device_serial_no as DEVICE_SERIAL_NUM,gdid.DEVICE_PORT,
gdid.DEVICE_VENDOR,gdid.DEVICE_TYPE,gdid.DEVICE_MODEL,
from Generic_device_demo_table gdid;

If you try to run this above Query you will an error like this:-

So here directly come to the point:-

So for the above Query how will get it executed, lets see:-

For more information , you can check the full details here in the below links:-

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Prem prakash Srivastava

I’m a software developer and computer programmer with an avid interest in Data Structures, Algorithms and Optimization.