What the best way to design an increase/decrease field? [duplicate]

1. How can you prevent data duplication in a field?
2. Which of the following is a best practice for form field titles?

How can you prevent data duplication in a field?

You can prevent duplicate values in a field in an Access table by creating a unique index. A unique index is an index that requires that each value of the indexed field is unique.

Which of the following is a best practice for form field titles?

Takeaway: If you want users to scan a form quickly, put labels above the fields. The layout will be easier to scan because the eye will move straight down the page. However, if you want users to read carefully, put labels to the left of the fields.