# 以下sql可能性能不是很好，但用到了很多sql知识(备忘)：
1. insert..select 批量导入数据。
2. SPP_BOOKING_SEQ.nextval 序列的使用。
3. group by & order by 二者同时使用时，order by后的排序字段需要出现在select中。
4. (+)所在位置的另一侧为连接的方向，右连接说明等号右侧的所有记录均会被显示，无论其在左侧是否得到匹配。
5. nvl去空函数。
6. sum, min, group by 使用多个聚合函数。
sql1:
insert into pexweb.spp_supp_search_result_stg
(spp_kw_cat_id,
spp_kw_cat_desc,
spp_kw_cat_type,
last_1_mth_search_cnt,
last_3_mth_search_cnt,
last_12_mth_search_cnt,
refresh_date)
select SPP_SUPP_SEARCH_RESULT_SEQ.nextval,
spp_keyword,
'keyword',
last_1_mth_search_cnt,
last_3_mth_search_cnt,
last_12_mth_search_cnt,
sysdate
from (select *
from (select distinct (c.spp_keyword),
'keyword',
nvl(a.last_1_mth_search_cnt, 0) last_1_mth_search_cnt,
nvl(b.last_3_mth_search_cnt, 0) last_3_mth_search_cnt,
c.last_12_mth_search_cnt,
c.earliest_search_mth,
sysdate
from (select spp_keyword,
sum(search_cnt) last_1_mth_search_cnt
from spp_keyword_search_detail
where search_mth between
(select to_number(to_char(sysdate - interval '1'
month,
'yyyymm'))
from dual) and
(select to_number(to_char(sysdate, 'yyyymm'))
from dual)
group by spp_keyword) a,
(select spp_keyword,
sum(search_cnt) last_3_mth_search_cnt
from spp_keyword_search_detail
where search_mth between
(select to_number(to_char(sysdate - interval '3'
month,
'yyyymm'))
from dual) and
(select to_number(to_char(sysdate, 'yyyymm'))
from dual)
group by spp_keyword) b,
(select spp_keyword,
sum(search_cnt) last_12_mth_search_cnt,
min(search_mth) earliest_search_mth
from spp_keyword_search_detail
where search_mth between
(select to_number(to_char(sysdate - interval '12'
month,
'yyyymm'))
from dual) and
(select to_number(to_char(sysdate, 'yyyymm'))
from dual)
group by spp_keyword) c
where a.spp_keyword(+) = c.spp_keyword
and b.spp_keyword(+) = c.spp_keyword) d
order by last_12_mth_search_cnt desc, earliest_search_mth desc)
where rownum <= 200000
sql2: 子查询
左连接：左边字段全部会出现
select a.product_id "productId",
a.folder_id "folderId",
a.model_number "modelNumber",
a.short_desc "shortDesc",
a.category_desc "categoryDesc",
nvl2(b.id, 'ON', 'OFF') onlineStatus
from (select f.*
from folder_product f
where f.folder_id in (6000000094184, 6000000326795)
and (posting_status is null or
posting_status in ('Online', 'Offline'))
and model_number like '%nov%') a
left join (select distinct id
from product_val_entity p1
where attr_name = 'OnlineProduct'
and exists (select 1
from product_val_code
where attr_name = 'WebsiteType'
and value = 'GSOL'
and id = p1.value)) b on a.product_id = b.id
sql3: 公用的部分先准备好
with temp_data as (
select id from product_val_entity pve
where
exists (select 1
from product_val_code
where attr_name = 'Status'
and value = 'ON'
and id = pve.id)
and exists (select 1
from product_val_code
where attr_name = 'WebsiteType'
and value = 'GSOL'
and id = pve.id)
and exists (select 1
from product_val_entity
where attr_name = 'Contract'
and value = '2508813011239'
and id = pve.id)
)
select a.pdfSpecSheet, b.additionalProduct, c.additionalImages
from (select count(*) pdfSpecSheet
from product_val_entity pve
where attr_name = 'Supplier'
and value = '2008808594470'
and exists (select 1
from product_val_attachment
where attr_name = 'SpecFile'
and id = pve.id)
and exists (select 1
from temp_data
where id = pve.id)) a,
(select count(*) additionalProduct
from product_val_entity pve
where attr_name = 'Supplier'
and value = '2008808594470'
and exists (select 1
from product_val_group
where attr_name = 'ImageGroup'
and id = pve.id)
and exists (select 1
from temp_data
where id = pve.id)) b,
(select count(*) additionalImages
from product_val_group pve
where attr_name = 'ImageGroup'
and exists (select 1
from product_val_entity pve
where attr_name = 'Supplier'
and value = '2008814022300'
and id = pve.id)
and exists (select 1
from temp_data
where id = pve.id)) c