Create SQL Function view with User ID and Date range - sql

Question

As I title says, I need to create a Function View of two tables.
Below are the SQL Tables
CREATE TABLE User_Specialist(
ID_User_Specialist INT NOT NULL,
Name_User_Specialist VARCHAR(50) NOT NULL,
CONSTRAINT PK_ID_User_Specialist PRIMARY KEY(ID_User_Specialist),
GO
CREATE TABLE Incident(
ID_Incident INT IDENTITY(1,1) NOT NULL,
Incident_Creation_Date DATETIME NULL,
Assigned_Specialist INT NULL,
CONSTRAINT FK_Assigned_Specialist FOREIGN KEY (Especialista_Asignado) REFERENCES Usuario_Especialista(ID_Usuario_Especialista),
GO
Based on the previous information, I need the function to display Assign Specialist and the dates that the Incident was created.
Right know this is what I got:
CREATE FUNCTION View_Date (#ID_User_Incident INT)
RETURNS INT
AS
BEGIN
DECLARE #Total_Incidents INT
SELECT #Total_Incidents = COUNT(ID_Incident)
FROM Incidents i, User_Specialist u
WHERE i.ID_Incident = u.ID_User_Specialist AND u.ID_User_Specialist =#ID_User_Incident
RETURN (#Total_Incidents)
END
GO
DECLARE #Specialist_ID int;
EXEC #Specialist_ID = [dbo].View_Date
#ID_Incidentes_Usuarios = 5;
SELECT #Specialist_ID AS 'Assigned Specialist Incidents'
GO
The only thing missing is the dates range.

Answer 1

I believe you changed your table and field names to English from Spanish. You have missed some of them and there were some missing parenthesis. As much as I understand I changed them to understand better.
CREATE TABLE User_Specialist
(
ID_User_Specialist INT NOT NULL,
Name_User_Specialist VARCHAR(50) NOT NULL
CONSTRAINT PK_ID_User_Specialist PRIMARY KEY(ID_User_Specialist)
)
GO
CREATE TABLE Incident
(
ID_Incident INT IDENTITY(1,1) NOT NULL,
Incident_Creation_Date DATETIME NULL,
Assigned_Specialist INT NULL
CONSTRAINT FK_Assigned_Specialist FOREIGN KEY (Assigned_Specialist) REFERENCES User_Specialist(ID_User_Specialist)
)
GO
If you want to see multiple columns or rows as result you need to use Table-valued Function. I have created sample query from your table and prepared function. you can change it with what you want.
CREATE FUNCTION dbo.FN_ViewDate
(
#ID_User_Incident INT
)
RETURNS #Result TABLE
(
TotalIncidents INT
,FirstIncidentDate DATETIME
,LastIncidentDate DATETIME
)
AS
BEGIN
INSERT INTO #Result
SELECT COUNT(ID_Incident)
,MIN(Incident_Creation_Date)
,MAX(Incident_Creation_Date)
FROM Incident I
LEFT JOIN User_Specialist U ON I.Assigned_Specialist = U.ID_User_Specialist
WHERE I.Assigned_Specialist = #ID_User_Incident
RETURN
END
GO

Answer 2

I think this query can help you.
declare #count int = 0 , #dates varchar(200) =''
SELECT #count+=1 , #dates +=' '+ i.Incident_Creation_Date
FROM Incidents i, User_Specialist u
WHERE i.ID_Incident = u.ID_User_Specialist AND u.ID_User_Specialist =#ID_User_Incident
select #count as [count] ,#dates [incidentDates]