How to create a sequence number to insert values to database

I am working on the application for the client to insert their vendor informaton to our database. We have a refvendor table and vendorid is primary key. I was asked for the vendorid to be a sequential number. I am not sure if the DBA set up the vendor id to be a sequential number by creating sequence or is this something i can do myself. if so can you help me how i can create and make the vendor id a sequentiial number. Thank you
Tablename is Refvendor
vendorId, vendorname, dbestaus

user452051 wrote:
thank you for the reply. I am still learning about sequence. so the value from seq.netval will be inserted to the vendor id field. my first number will be 00001,00002,00003,00004,.... How can I do for the sequence to start with 00001If you create a sequence as shown, it will start with 1
,..... and my other question if I delete sequence 00002 will the number be re-arranged?no
There will be gaps in the numbers.

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