1
下面的sql查詢對CASE WHEN中的所有檢查很有效,接受一些電子郵件。當我每次運行查詢檢查電子郵件有時它有效,有時它不。我做了一個RTRIM(LTRIM(m.Email)),這也不起作用。 比較電子郵件時,我需要做些什麼不同嗎?CASE當不使用電子郵件時
exec BuildingPros.uspGetEmployees 1697,'Email','[email protected]'
alter proc BuildingPros.uspGetEmployees
@ProID INT,
@Where VARCHAR(12) = NULL,
@Equals VARCHAR(25) = NULL
AS
SELECT m.UserId,u.UserName,e.NonProID'ID',m.Email,c.FirstName'FName',c.LastName'LName',
ISNULL(c.Title,'NA')'Title',z.ZIPCode'Zip', p.Phone
FROM Person.UtbAddressesutbContact ac JOIN
Person.utbAddresses a ON ac.AddressID = a.AddressID JOIN
Person.utbContact c ON ac.ContactID = c.ContactID JOIN
Person.utbZipCodes z ON z.ZipCodeID = a.ZipCodeID JOIN
Person.utbCitys city ON city.CityID = z.CityID JOIN
Person.utbContactUtbPhones cp ON c.ContactID = cp.ContactID JOIN
Person.utbPhones p ON p.PhoneID = cp.PhonesID JOIN
NonPros.utbNonProsUtbAddresses ea ON a.AddressID = ea.AddressID JOIN
aspnet_Membership m JOIN
NonPros.NonPros e ON m.UserId = e.UserID ON ea.NonProID = e.NonProID JOIN
BuildingPros.utbProfessionalsUtbNonPros pe ON e.NonProID = pe.NonProID JOIN
dbo.aspnet_Users u ON u.UserId = m.UserId
WHERE
CASE @Where
WHEN 'Email' THEN m.Email
WHEN 'Name' THEN c.LastName
WHEN 'Zip' THEN z.ZIPCode
WHEN 'ST' THEN z.StateCD
WHEN 'Title' THEN c.Title
WHEN 'TimeZone' THEN z.TimeZone
WHEN 'City' THEN city.City
END = @Equals
它看起來像'aspnet_Membership'上的連接被剪切並與其on子句奇怪地粘貼。這是電子郵件地址的來源。 – HABO
我只想指出,在WHERE子句中使用這樣的CASE意味着優化器將無法使用索引構建高效計劃,我懷疑無論輸入如何,最終都會進行表掃描。您最好將查詢分成7個查詢,使用WHERE m.Email = @Equals等。運行哪個子查詢可由IF子句確定。如果你想進一步整理,你可以讓每個人都在子存儲過程中查詢。 –
您還可以使用Like運算符進行字符串比較。 – Hiral