我编写了以下查询来选择一些记录：
select
b.building_name ,
lp.lease_id ,
lp.suite_id ,
lp.suite_name ,
lp.tenant_trading_name ,
sco.scca_uplift as 'Current GST Uplift Jan 2011' ,
nu.new_uplift as 'GST Uplift Jan 2011 Post-Change' ,
lp.scca_broad_category_code ,
lp.scca_sales_group_code ,
lp.scca_fine_categories_code ,
lp.scca_notes_code
, '(lease_id = ''' + lp.lease_id + ''' and suite_id ='''
+ lp.suite_id + ''') or' as 'Base SQL Output'
from
property.lease_period lp
inner join property.property b
on b.building_id = lp.building_id
inner join
(
select scca_uplift ,
scca_broad_category_code ,
scca_fine_categories_code ,
scca_sales_group_code
from property.lease_period
where period_id = 252
) sco
on sco.scca_broad_category_code = lp.scca_broad_category_code
and sco.scca_sales_group_code = lp.scca_sales_group_code
and sco.scca_fine_categories_code = lp.scca_fine_categories_code
inner join
(
-- Department Store
select '10' as scca_broad_category_code,
'100' as scca_sales_group_code,
'1000' as scca_fine_categories_code,
109.8 as new_uplift
-- Discount Department Stores
union all
select '10' as scca_broad_category_code,
'110' as scca_sales_group_code,
'1100' as scca_fine_categories_code,
109.5 as new_uplift
-- Supermarket
union all
select '10' as scca_broad_category_code,
'130' as scca_sales_group_code,
'1300' as scca_fine_categories_code,
105.0 as new_uplift
-- Newsagents and Stationary
union all
select '30' as scca_broad_category_code,
'340' as scca_sales_group_code,
'3403' as scca_fine_categories_code,
110.0 as new_uplift
-- Discount Variety
union all
select '30' as scca_broad_category_code,
'350' as scca_sales_group_code,
'3502' as scca_fine_categories_code,
109.5 as new_uplift
-- Optometrist
union all
select '30' as scca_broad_category_code,
'380' as scca_sales_group_code,
'3801' as scca_fine_categories_code,
110.0 as new_uplift
) nu
on nu.scca_broad_category_code = lp.scca_broad_category_code
and nu.scca_sales_group_code = lp.scca_sales_group_code
and nu.scca_fine_categories_code = lp.scca_fine_categories_code
where
(
-- Department Store
( lp.scca_broad_category_code = '10' and
lp.scca_sales_group_code = '100' and
lp.scca_fine_categories_code = '1000' and
lp.scca_notes_code in ('10001', '10002'))
-- Discount Department Store
or
( lp.scca_broad_category_code = '10' and
lp.scca_sales_group_code = '110' and
lp.scca_fine_categories_code = '1100' and
lp.scca_notes_code in ('11001', '11002', '11003', '11004'))
-- Supermarket
or
( lp.scca_broad_category_code = '10' and
lp.scca_sales_group_code = '130' and
lp.scca_fine_categories_code = '1300' and
lp.scca_notes_code in ( '13001', '13002', '13003', '13004', '13005',
'13006', '13007', '13007',
'13008', '13009', '13010', '13011', '13012',
'13013', '13014'))
-- Newsagents and Stationary
or
( lp.scca_broad_category_code = '30' and
lp.scca_sales_group_code = '340' and
lp.scca_fine_categories_code = '3403')
-- Discount Variety
or
( lp.scca_broad_category_code = '30' and
lp.scca_sales_group_code = '350' and
lp.scca_fine_categories_code = '3502')
-- Optometrist
or
( lp.scca_broad_category_code = '30' and
lp.scca_sales_group_code = '380' and
lp.scca_fine_categories_code = '3801')
)
and b.building_id <> 42000
and lp.scca_uplift is not null
and lp.period_id >= 252
order by
b.building_name ,
scca_broad_category_code ,
scca_sales_group_code ,
scca_fine_categories_code ,
scca_notes_code
我现在要做的是编写一个查询，该查询将采用nu.new_uplift列并将其应用于当前正在显示的每一行，并显示其现在显示的值（令人困惑的句子，请告诉我，如果我应该另外解释一下）。我以为我可以通过使用CTE来做到这一点，但我不相信这是可能的，因为我正在使用子查询进行连接。考虑到这一点 - 我应该在这里使用什么？
答案 0 :(得分：2)
非常宽泛地说，UPDATE... from...应该在这里工作。一个可能的模板：
UPDATE TableName
set ColName = Alias2.OtherColName
from TableName Alias1
inner join OtherTableName Alias2
on JoinCriteria
where FilteringCriteria
与SELECT语句一样，＆＃34; OtherTableName＆＃34;可以替换为大多数任何表os子查询。
在这里，我会选择要更新的表格，将其作为＆＃34;中的第一个列出来自＆＃34;然后，将它适当地加入到一个怪物子查询中（没有ORDER BY子句）。
答案 1 :(得分：0)
我使用以下内容来应用此更改（为了兴趣而发布）但是Philip发布的方法要好得多：
begin transaction
update property.lease_period
set scca_uplift =
(
case
when -- Department Store
(
scca_notes_code in ('10001', '10002') and
scca_broad_category_code = '10' and
scca_sales_group_code = '100' and
scca_fine_categories_code = '1000'
)
then '109.8'
when -- Discount Department Store
(
scca_notes_code in ('11001', '11002', '11003', '11004') and
scca_broad_category_code = '10' and
scca_sales_group_code = '110' and
scca_fine_categories_code = '1100'
)
then '109.5'
when -- Supermarket
(
scca_notes_code in ( '13001', '13002', '13003', '13004', '13005',
'13006', '13007', '13007',
'13008', '13009', '13010', '13011', '13012',
'13013', '13014') and
scca_broad_category_code = '10' and
scca_sales_group_code = '130' and
scca_fine_categories_code = '1300'
)
then '105.0'
when -- Newsagents and Stationary
(
scca_broad_category_code = '30' and
scca_sales_group_code = '340' and
scca_fine_categories_code = '3403'
)
then '110.0'
when -- Discount Variety
(
scca_broad_category_code = '30' and
scca_sales_group_code = '350' and
scca_fine_categories_code = '3502'
)
then '109.5'
when -- Optometrist
(
scca_broad_category_code = '30' and
scca_sales_group_code = '380' and
scca_fine_categories_code = '3801'
)
then '110.0'
end
)
where
period_id >= 252 and
building_id <> 42000 and
scca_uplift is not null
rollback transaction