Multiple Joins on Same Table but Different Values - sql

Question

I have an system where users are able to select multiple values from different fields whilst filling out an application. All of the various values for those multi-values fields are contained in one table, linked to the user's entry application by an application ID. (I would not have designed it this way but I inherited the db). I'm trying to write a select statement that queries multiple rows in Table 2 based on unique row in Table 1.
So, tables look like this:
Application Table (Table1)
Application_ID
Applicant_Name
Application_Title
Application_Date
1073
John Smith
John's Application
07/15/2021
2104
Belinda Jones
Belinda Applies
07/29/2021
Selection Table(Table2)
Application_ID
Name
Value
Sort_Order
1073
State
Texas
2
1073
State
Ohio
1
1073
Color
Red
2
1073
Color
Blue
1
1073
Color
Orange
2
2104
Color
Green
1
2104
Color
Purple
2
2104
State
Delaware
1
I've previously used a left join to pull the values from just one multi-value field in the Selection Table:
select Left(Selection,Value,100) as 'State'
and later in the where cause, define which row by using:
where Selection.Name = 'State'
and Selection.Sort_order = 1
But I can't sort out the best way to write a select statement that pulls all values from the Selection table per Application ID. I need to have the values from all of the multi-value fields (Name from Table 2) associated with the one Application ID.

Answer 1

I think you need some conditional aggregation here -
SELECT Applicant_Name, Application_Title, Application_Date,
STRING_AGG(iif(Name = 'State', Value, ''), ',') STATE,
STRING_AGG(iif(Name = 'Color', Value, ''), ',') COLOR
FROM Table1 T1
LEFT JOIN Table2 T2 ON T1.Application_ID = T2.Application_ID
GROUP BY Applicant_Name, Application_Title, Application_Date;