"By taking their uniforms home, workers run the risk of contaminating their home environment, including the washing machine, because unlike in-house or industrial laundries, there is no segregation of laundry based on designated soiled and clean areas. We know that preferences matter to our players, and due to this, we offer a wide range of colors and designs in our uniforms. The truth of the matter is that a URI is really a serialized representation of multiple data points: a protocol, host address, port, path, params, and anchors.

One step better is to add a regex to match URI syntax, and wrap the check in a custom domain as we have done so many times in this article already. The type is fairly permissive, it will let you cast any string as uri, but the functions provided by the extension allow us to check that certain parts of the URI exist. While we’re on the topic of the network, don’t forget the built-in inet type to represent IPv4/IPv6 addresses and optionally subnets.

Prices are non-negative. You don’t want a prankster getting a rebate for buying something of negative price.

It does require caution: don’t over-specify a domain or field in any way that would prevent users from entering a valid real-life domain value. We might unify the concept of a lifespan into a date range field where the end date is allowed to be unbounded. The naive way to store them is in a text field. All text fields have a common-sense size limit.

Some text fields follow totally precise formats, and we can enforce them with regular expressions. In fact, in PostgreSQL the performance between varchar and text is the same (same data structure underneath), the only difference is that varchar(n) enforces a maximum length. We could use varchar(50), or wrap the text type in a domain. The PostGIS geometry type can represent locations using various projections, and to calculate properly it’s important to use the expected type of geometry.

I’m sure you can think of more, but here is a start.

What’s more, their format isn’t even standardized. If you have a telemarketer in place to qualify the leads first, even better. They are great tools for adding borders to scrapbooks, personalizing wedding and baby shower invites, and even for adding fine details to woodworking or fabric projects. There are plenty of examples of this use of preventative domain integrity.

However enforcing them doesn’t fit single-field domain integrity very well because a lifespan relates two values, not one: a person’s first and last day alive. In particular, enforcing business rules and the law. The ranks progress to senior deputies and sergeants who supervise and manage day-to-day operations, starting with deputy sheriffs, who perform general law enforcement duties. It’s a little more typing, but does allow greater flexibility such as the enforcement of minimum length.

Wage greater than legal minimum. Traditionally people would use the varchar(50) type to represent such a constraint. Data about people involves natural constraints. Most importantly depesz identified that updating the limit in varchar takes more intensive database write-locks than updating the constraints on a domain.

It’s sensible to pick an upper limit of fifty Unicode characters.

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