sql语句优化之not in

多表关联想查a表中除去b表的可用not exists 效率比not in 更高

优化后的语句用时0.421秒

select john.*,
(case
when round((case john.sumcount
when 0 then
0
else
mycount * 100 / sumcount
end),
2) > 100 then
100
else
round((case john.sumcount
when 0 then
0
else
mycount * 100 / sumcount
end),
2)
end) lv
from (select ‘路径外‘ kind,
cp_id,
(select cp_node_name
from lcp_master_node n
where n.cp_id = o.cp_id
and n.cp_node_id = o.cp_node_id) node_name,
cp_node_id,
LOCAL_ORDER_TEXT,
LOCAL_ORDER_NO,
MEASURE,
IS_ANTIBIOTIC,
MEASURE_UNITS,
count(*) mycount,
(select count(*)
from (select count(*)
  from LCP_PATIENT_LOG_ORDER r
 where r.cp_id = ‘10896‘
 group by patient_no)) sumcount
from LCP_PATIENT_LOG_ORDER o
where cp_id = ‘10896‘
group by cp_id,
cp_node_id,
LOCAL_ORDER_TEXT,
LOCAL_ORDER_NO,
MEASURE,
IS_ANTIBIOTIC,
MEASURE_UNITS) john
where NOT EXISTS
(select *
from lcp_node_order_item i
where i.cp_id = john.cp_id
and i.cp_node_id = john.cp_node_id
and i.CP_NODE_ORDER_TEXT = john.local_order_text)
order by cp_node_id, mycount desc;