mysql - How to handle null field value when using LIKE -

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table data:

enter image description here

i have sql script:

select     ei.objid entityindividual ei  inner join entity e      on ei.objid = e.objid left join entity_address ea      on ei.objid = ea.parentid ei.gender = 'm' , isnull(ea.barangay_name) '%'

if run script, 6 records displayed, without using isnull(ea.barangay_name), 1 record diplayed.

but consider scenario:

select     ei.objid entityindividual ei  inner join entity e      on ei.objid = e.objid left join entity_address ea      on ei.objid = ea.parentid ei.gender = 'm' , isnull(ea.barangay_name) '%buenavista%'

the problem no records display when run script above. why? how fix one?

try using coalesce instead of isnull.

http://www.w3resource.com/mysql/comparision-functions-and-operators/coalesce-function.php

select     ei.objid entityindividual ei  inner join entity e      on ei.objid = e.objid left join entity_address ea      on ei.objid = ea.parentid ei.gender = 'm' , coalesce(ea.barangay_name,'') '%buenavista%'

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