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                        case when (kjsj>tjsj and kjrq>tjrq) then (kjrq-tjrq)||'.'||(kjsj-tjsj)
                                when (kjsj>tjsj and kjrq=tjrq) then replace(substr(0||'.'||(kjsj-                                                                                      tjsj),1,4),'..','.')
                                when kjsj=tjsj then (kjrq-tjrq)||''
                                when kjsj <tjsj then (kjrq-tjrq-1)||'.'||(24-(tjsj-kjsj))
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