乙個統計介面，前端需要返回兩個陣列，乙個是0-23的小時計數，乙個是各小時對應的統計數。
思路 直接使用group by查詢要統計的表，當某個小時統計數為0時，會沒有該小時分組。思考了一下，需要建立輔助表，只有一列小時，再插入0-23共24個小時
create table hours_list (
hour int not null primary key
)先查小時表，再做連線需要查的表，即可將沒有統計數的小時填充上0。這裡由於需要查多個表中，create_time在每個小時區間內、且source_id等於查詢條件的統計之和，所以union all了多張表
select
t.hour,
程式設計客棧sum(t.hour_count) hourcount
from
(select
hs. hour as hour,
count(cs.record_id) as hour_count
from
cbc_hours_list hs
left join cbc_source_0002 cs on hour (cs.create_time) = hs. hour
and cs.create_time > #
and cs.create_time <= #
and source_id = #
#if>
group by
hs. hour
union all
select
hs.hour as hour,
count(cs.record_id) as hour_count
from
cbc_hours_list hs
left join cbc_source_hs cs on hour (cs.create_time) = hs. hour
and cs.create_time > #
and cs.create_time <= #
and source_id = #
#if>
group by
hs. hour
union all
select
hs.hour as hour,
count(cs.record_id) as hour_count
from
cbc_hours_list hs
left join cbc_source_kfyj cs on hour (cs.create_time) = hs. hour
and cs.create_time > #
and cs.create_time <= #
and source_id = #
#if>
group by
hs. hour
union all
select
hs.hour as hour,
count(cs.record_id) as hour_count
from
cbc_hours_list hs
left join cbc_source_his_0002 cs on hour (cs.create_time) = hs. hour
and cs.create_time > #
and cs.create_time <= #
and source_id = #
#if>
group by
hs. hour
union all
select
hs.hour as hour,
count(cs.record_id) as hour_count
from
cbc_hours_list hs
left join cbc_source_his_hs cs on hour (cs.create_time) = hs. hour
and cs.create_time > #
and cs.create_time <= #
unnhyrzxsid !=''>
and source_id = #
#if>
group by
hs. hour
union all
select
hs.hour as hour,
程式設計客棧 count(cs.record_id) as hour_count
from
cbc_hours_list hs
left join cbc_source_his_kfyj cs on hour (cs.create_time) = hs. hour
and cs.create_time > #
and cs.create_time <= #
and source_id = #
#if>
group by
hs. hour) t
group by
t.hour
統計數為0的小時也可以查出來了。
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