database - Mysql <= is giving the wrong output -

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my table

starttime   |   endtime  |   id  10:30            11:30        1 11:30            12:30        2 14:30            16:30        3 15:30            16:30        4

if wanted select id's between 10:30 12:30 use below command

select id table str_to_date(starttime,'%h:%i')>='10:30' ,       str_to_date(endtime,'%h:%i')<='12:30';

this gives me id 1 ,but not giving me 2 , if change 12:30 12:40 gives me 1 & 2.but using less or equal should give me both id's right? why not working that?

the problem trying compare date object against string. precise, in following expression

str_to_date(starttime,'%h:%i') >= '10:30'

str_to_date returns date, '10:30' varchar (which coincidentally looks time). if want continue down road, should cast both sides of comparison using str_to_date:

select id table str_to_date(starttime,'%h:%i') >= str_to_date('10:30','%h:%i') ,       str_to_date(endtime,'%h:%i') <= str_to_date('12:30','%h:%i');

but long term better approach make starttime , endtime columns either datetime or timestamp.

sqlfiddle


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