MySQL 5.7 STR_TO_DATE

Question

I am running MySQL 5.7 and wanted to convert some strings to date. I referred the manual here: http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_str-t

Answer 1

As it says in the manual,

If the NO_ZERO_DATE or NO_ZERO_IN_DATE SQL mode is enabled, zero dates or part of dates are disallowed. In that case, STR_TO_DATE() returns NULL and generates a warning

That causes the result to be NULL in cases such like this, because your partial “date” contains zero values.