我想检查数据，但如果它为空或空忽略它。目前查询如下…
Select
Coalesce(listing.OfferText, company.OfferText, '') As Offer_Text,
from tbl_directorylisting listing
Inner Join tbl_companymaster company
On listing.company_id= company.company_id
但我想找个伴。OfferText如果列表。Offertext是一个空字符串，如果它是null。
最好的解决方案是什么?
当前回答
这个语法:
SELECT *
FROM tbl_directorylisting listing
WHERE (civilite_etudiant IS NULL)
在Microsoft SQL Server 2008 (SP3)为我工作
其他回答
这里有一个解决方案，但我不知道它是否是最好的....
Select
Coalesce(Case When Len(listing.Offer_Text) = 0 Then Null Else listing.Offer_Text End, company.Offer_Text, '') As Offer_Text,
from tbl_directorylisting listing
Inner Join tbl_companymaster company
On listing.company_id= company.company_id
Select
Coalesce(NullIf(listing.OfferText, ''), NullIf(company.OfferText, ''), '') As Offer_Text,
from tbl_directorylisting listing
Inner Join tbl_companymaster company
On listing.company_id= company.company_id
您可以使用ISNULL并根据已知输出检查答案:
SELECT case when ISNULL(col1, '') = '' then '' else col1 END AS COL1 FROM TEST
SELECT
COALESCE(listing.OfferText, 'company.OfferText') AS Offer_Text,
FROM
tbl_directorylisting listing
INNER JOIN tbl_companymaster company ON listing.company_id= company.company_id
Select
CASE
WHEN listing.OfferText is null or listing.OfferText = '' THEN company.OfferText
ELSE COALESCE(Company.OfferText, '')
END As Offer_Text,
from tbl_directorylisting listing
Inner Join tbl_companymaster company
On listing.company_id= company.company_id
