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wso_id	Bassin versant
291111	Loire

select up_area, wso_id from ccm21.riversegments where up_area is not null and nextdownid=-9999
select up_area, wso_id from ccm21.riversegments where nextdownid=-9999 order by up_area

select sum(up_area) from ccm21.riversegments_france where up_area is not null and nextdownid=-9999 and wso_id=291111
select wso_id as id_bassin, up_area as surface from ccm21.riversegments_france where up_area is not null and nextdownid=-9999 order by wso_id

select up_area, wso_id from ccm21.riversegments_france where nextdownid=-9999 order by up_area
select up_area, wso_id, wso1_id from ccm21.riversegments where nextdownid=-9999 order by wso_id