The following SQL statement defines the "Personid" column to be an auto-increment primary key field in the "Persons" table:. To insert a new record into the "Persons" table, we will NOT have to specify a value for the "Personid" column a unique value will be added automatically :. The SQL statement above would insert a new record into the "Persons" table. The "Personid" column would be assigned a unique value. You will have to create an auto-increment field with the sequence object this object generates a number sequence.
It will also cache up to 10 values for performance. The cache option specifies how many sequence values will be stored in memory for faster access. Forgot your password? Ask a Question. Please Sign up or sign in to vote. See more: SQL. I've been having this problem with my database where it kept on incrementing the id column even though it has been removed.
Lets say i have an id column from 1 - Now i want to add an item, its id will be But when i remove item 17 and decided to add an item again, it will proceed to Its creating this huge gap in my id column because of its continued auto-incrementing the id column. What i want to happen is, when i remove an item, i want it to start from the last id which is So the next id should be I hope this makes sense for you guys.
Copy Code. Posted 8-May pm BebeSaiyan. Add a Solution. Accept Solution Reject Solution. You can do it, but be careful. An identity column doesn't guarantee uniqueness. There are many database diagramming tools that are not only incredibly useful but also free.
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