when did patient 49457 get the lipase lab test until 06/2105 for the first time?
select labevents.charttime from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'lipase' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 49457 ) and strftime('%y-%m',labevents.charttime) <= '2105-06' order by labevents.charttime asc limit 1