operand should contain 1 column(s) subquery MySQL -

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i have problem when make subquery

select r.request_id,  (  (select e.reportsto, (select e1.firstname employees e1 e1.nik = e.reportsto) firstname,   (select e1.nik employees e1 e1.nik=e.nik) attention,   (select e1.firstname employees e1 e1.nik=e.nik) attentionname   employees e e.reportsto ='cs-nik-2016-0150' , e.nik='cs-nik-2016-0160')  )  request r r.request_id='cs-req-bdg-201604-10099'

operand should contain 1 column(s), why?

use join instead of subquery. subquery may returns more 1 row,so shows error. avoid error use limit each of select not best solution,as in case return 1st row.

select r.request_id, ( (select e.reportsto, (select e1.firstname employees e1 e1.nik = e.reportsto limit 1) firstname,   e.nik attention, firstname attentionname  employees e e.reportsto ='cs-nik-2016-0150' , e.nik='cs-nik-2016-0160') ) request r r.request_id='cs-req-bdg-201604-10099'

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