johngordon — 2013-12-13T07:29:31-05:00 — #1
I'm using phpMyAdmin for a simple mySQL database. Am a bit confused here, as I have two date fields which as far as I can tell are the same - i.e. Date, with a default of NULL, with NULL ticked.
If I update a record, but leave both of those fields blank, one stays blank, and the other gets populated with 0000-00-00 (and displays 30 November -0001 on the website.)
Any pointers on why two supposedly identical fields are behaving differently?
r937 — 2013-12-13T08:32:30-05:00 — #2
for starters, those columns aren't identical -- one allows NULL, the other doesn't
what happens when you "leave both of those fields blank" is this --
since the NOT NULL column doesn't allow a null, mysql, in its infinite wisdom, instead of rejecting the insert with an error message, decides that it will try to insert a non-null value, and substitutes the "zero" value, which in the case of a DATE column is "0000-00-00" (even though this isn't a valid date by normal standards, mysql allows it)
not sure how you get 30 November -0001 from 0000-00-00, though
johngordon — 2013-12-13T08:50:37-05:00 — #3
They were set up identically in phpMyAdmin, i.e. both set to allow NULL there.
I have resolved it though - the issue was the syntax in the update script where I had to change a ' ' to a NULL and a LIKE to an =.