我正在将数据从源迁移到目标。某个映射指定如果一个字段不为空,则会创建一个额外的记录并将其插入到目标表中。我的查询看起来像这样至今:从选择查询插入期间追加行
select Cast('' as nchar(18)) as Id,
Cast('' as nvarchar(255)) as Error,
case
when a.CONSTR_CASH_ALWNC_TYPE = 'Amount' then 'Amount'
when a.CONSTR_CASH_ALWNC_TYPE = 'Per Sq. Ft.' then 'Rate/SF'
end as TI_Input__c,
case
when a.CONSTR_CASH_ALWNC_TYPE <> null or a.CONSTR_CASH_ALWNC_TYPE <> '' then 'Cash Allowance'
end as Improvement_Type__c,
case
when a.CONSTR_CASH_ALWNC_TYPE = 'Amount' then a.CONSTR_CASH_ALWNC_AMT
when a.CONSTR_CASH_ALWNC_TYPE = 'Per Sq. Ft.' then a.CONSTR_CASH_ALWNC_PSF_RATE
end as Amount_Rate__c,
case
when a.LANDLORD_WORK_EST_CST <> null or a.LANDLORD_WORK_EST_CST <> '' then
-- append another row with different values for fields TI_Input__c,
-- Improvement_Type__c, Amount_Rate__c to be inserted
-- destination table
into [Migration_DataUpdate].dbo.Tenant_Improvement__c
-- source table
from [SSLE].dbo.Deal_Original_or_Amendment a
LEFT JOIN [SALESFORCE_LOCAL].dbo.[Opportunity] b on a.[DEAL_ID] = b.Opportunity_Id__c
我将如何利用case语句SELECT查询插入过程中附加一个行?