Oracle 12c and Sequences. The person_id is the identity column that identifies unique rows in the table. Code language: SQL (Structured Query Language) (sql) In this example, the persons table has three columns: person_id, first_name, and last_name.. Oracle to EDB migration using XDB CREATE Oracle PL/SQL: Check if record exists - OrclQA.Com Create a sequence Connected to: Oracle Database 12c Standard Edition Release 12.1.0.2.0 - 64bit Production SQL> create sequence test_seq start with 100 increment by 10; … Oracle they (not in/not exists) deal with NULLS very differently. You can use sequences to automatically … object_name [@ dblink]; OR REPLACE Allows you to recreate the synonym (if it already exists) without having to issue a DROP synonym command. SELECT LAST_NUMBER FROM ALL_SEQUENCES WHERE SEQUENCE_NAME = 'seq_name'; ALTER SEQUENCE seq_name INCREMENT BY 100; -- Value to reach desired value - 1 SELECT seq_name.nextval FROM dual; -- Reinitialize value to desired ALTER SEQUENCE seq_name INCREMENT BY 1; -- Back to init step SCENARIO 2: CREATE TABLE … In addition, the identifier must start with an … January 04, 2013 - 11:23 am UTC. The current draft SQL database language standard, informally called SQL:200x, … synonym_name FOR [schema .] Oracle You can check if the sequence already exists or not by giving the sequence name in the USER_SEQUENCES table. if not exist create sequence Cause: The specified sequence does not exist, or the user does not have the required privilege to perform this operation. INCREMENT [ BY ] [ = ] sequence_interval – Specifies the step interval of the sequence Snowflake Create Sequence Example.