SQL服務器相當於GROUP_CONCAT（）

enter image description here

，我需要得到以下數據每個客戶：

客戶名稱
合同名稱
該項目（s）
名員工誰登錄小時將項目從當月的第一天至當月最後一天
月期間記錄的每一個員工
員工比率
每位員工的總費用總小時數（即員工比率X員工工時）
結算聯繫人（圖）名稱，地址]對於每個合同

我有以下查詢，到目前爲止，但我需要實現MySQL的GROUP_CONCAT的MSSQL版本（）

SELECT 

Cl.LegalName AS ClientNames, 
Cr.ContractDesc AS ContractNames, 
P.ProjectName AS ProjectNames, 
(E.FirstName + ' ' + E.LastName) AS EmployeeNames, 
SUM(WH.HoursWorked) AS TotalHours, 
(SUM(WH.HoursWorked) * BR.Rate) AS TotalCharges, 
(Ca.FirstName + Ca.LastName + ', ' + Ca.AddrLine1) AS BillingContacts 

FROM Clients Cl 
JOIN Contracts Cr 
ON(Cl.ClientID = Cr.ClientID) 

JOIN Projects P 
ON(Cr.ContractID = P.ContractID) 

JOIN EmployeesProjects EP 
ON(P.ProjectID = EP.ProjectID) 

JOIN Employees E 
ON(EP.EmpID = E.EmpID) 

JOIN WorkHours WH 
ON(E.EmpID = WH.EmpID) 

JOIN BillingRates BR 
ON(E.TitleID = BR.TitleID) AND (E.Level = BR.Level) 

JOIN ContractsContacts CC 
ON(Cr.ContractID = CC.ContractID) 
JOIN Contacts Ca 
ON(CC.ContactID = Ca.ContactID) 

WHERE WH_Month = 4 
AND WH_Year = 2013

當我開始以下this例子，我到這裏停了下來，因爲我意識到，我不能引用來自其他子查詢（ProjectNames）表別名（CR）。

SELECT 
Cl.LegalName AS ClientNames, 
(
    SELECT ContractDesc + ', ' 
    FROM Contracts Cr 
    WHERE Cl.ClientID = Cr.ClientID 
    FOR XML PATH('') 
) ContractNames, 
(
    SELECT ProjectName + ', ' 
    FROM Projects P 
    WHERE Cr.ContractID = P.ContractID 
    FOR XML PATH('') 
) ProjectNames 


FROM Clients Cl

我該如何去做這件事？

來源

2013-10-01 Joe Boris

的可能重複（http://stackoverflow.com/questions/451415/simulating-group-concat-mysql-功能功能於微軟的SQL服務器2005年） – podiluska

嘗試CROSS APPLY做yhis：

例如：

SELECT Cl.LegalName AS ClientNames, 
B.ContractDesc AS ContractNames, 
P.ProjectName AS ProjectNames, 
(E.FirstName + ' ' + E.LastName) AS EmployeeNames, 
SUM(WH.HoursWorked) AS TotalHours, 
(SUM(WH.HoursWorked) * BR.Rate) AS TotalCharges, 
(Ca.FirstName + Ca.LastName + ', ' + Ca.AddrLine1) AS BillingContacts 

FROM Clients Cl 
JOIN Contracts Cr ON(Cl.ClientID = Cr.ClientID) 
JOIN Projects P ON(Cr.ContractID = P.ContractID) 
JOIN EmployeesProjects EP ON(P.ProjectID = EP.ProjectID) 
JOIN Employees E ON(EP.EmpID = E.EmpID) 
JOIN WorkHours WH ON(E.EmpID = WH.EmpID) 
JOIN BillingRates BR ON(E.TitleID = BR.TitleID) AND (E.Level = BR.Level) 
JOIN ContractsContacts CC ON(Cr.ContractID = CC.ContractID) 
JOIN Contacts Ca ON(CC.ContactID = Ca.ContactID) 
CROSS APPLY (
    SELECT Cr1.ContractDesc + ', ' 
    FROM Contracts Cr1 
    WHERE Cl.ClientID = Cr1.ClientID 
    FOR XML PATH('') 
) B (ContractDesc) 
WHERE WH_Month = 4 AND WH_Year = 2013

來源

2013-10-01 08:04:33

做這樣

SELECT Cl.LegalName AS ClientNames, 
    ContractNames 
    FROM Clients Cl 
    cross apply 
    (SELECT Cr1.ContractDesc + ', ' 
    FROM Contracts Cr1 
     WHERE Cl.ClientID = Cr1.ClientID For XML PATH(''))a1 (ContractNames)

來源

2013-10-01 08:30:49

STRING_AGG幾乎等同於在MySQL GROUP_CONCAT。請參閱Microsoft的官方文檔here

請注意，STRING_AGG不允許使用文本類型，因此如果要在文本字段上連接，則需要轉換爲NVARCHAR。

例如：[？模擬組\ _concat在Microsoft SQL Server 2005中的MySQL函數]

STRING_AGG(CONVERT(NVARCHAR(2000), your_text_field_name), ',')

來源

2017-06-03 03:01:41 Quan

SQL服務器相當於GROUP_CONCAT（）

回答

相關問題