On 9/21/16 1:50 PM, Steve Petrie, P.Eng. wrote:

The reason I ask is -- the maximum length of a valid email address is
actually 256 characters (or 254, according comments in the PHP function
is_valid_email_address(...) that I found on the Internet at
http://code.iamcal.com/ and use myself).

In my own PG DDL, I define email addresses like:

 contact_email_addr varchar(256) NOT NULL,

FWIW, I stay away from varchar limits that are more than a "suggestion". Generally speaking it's just not worth limiting to something like 50, then the business decides they want 60, then 70, then... I still use varchar to ensure the database can't get DOS'd with garbage, but I'll just set something like varchar(100). That said, if there's a defined limit for email address length, might as well use it...

Disclosure: I'm a PG newbie (and a relative SQL newbie, too), and not
familiar with the DEFAULT ":: notation in your DDL.

The :: is a cast that was presumably added by Postgres when the default was assigned. It's equivalent to DEFAULT ''. I definitely don't like defaults like that... if you don't know what the email is then it should be NULL. Or to put it another way, having a default set largely defeats the purpose of NOT NULL (IMHO).
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
855-TREBLE2 (855-873-2532)   mobile: 512-569-9461

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