Combine Two Queries with Separate Indexes - mysql

Question

I have two queries that pull data from two different tables, but I need them to pull in the same report. I have a shared key between them, and the first table has one entry that corresponds to many entries in the second table.
My first query:
SELECT Proposal_ID,
substr(Proposal_Name, 1, 3) AS Prefix,
substr(Proposal_Name, 4, 6) AS `Number`,
Institution,
CollegeCode,
DepartmentCode,
Proposer_FirstName,
Proposer_LastName
FROM proposals.proposal
WHERE Institution = 'T';
Sample Data:
+----+--------+--------+-------+----------+----------+-----------+----------+
| ID | Prefix | Number | Inst. | CollCode | DeptCode | FirstName | LastName |
+----+--------+--------+-------+----------+----------+-----------+----------+
| 18 | SYP | 4675 | T | AS | SOC | Linda | McGaff |
+----+--------+--------+-------+----------+----------+-----------+----------+
| 20 | GEO | 4340 | T | AS | SGS | Teddy | Graham |
+----+--------+--------+-------+----------+----------+-----------+----------+
My second query:
SELECT Parent_Proposal,
SUBSTRING_INDEX(GROUP_CONCAT(`status`.`Status_Code` ORDER BY `status`.`Status_Time` DESC), ',', 1) AS status_code,
SUBSTRING_INDEX(GROUP_CONCAT(`status`.`Status_Time` ORDER BY `status`.`Status_Time` DESC), ',', 1) AS status_timestamp
FROM proposals.`status`
GROUP BY `status`.Parent_Proposal
Sample Data:
+-----------------+-------------+----------------------+
| Parent_Proposal | Status_Code | Status_Time |
+-----------------+-------------+----------------------+
| 18 | 40 | 2016-11-09 06:30:35 |
+-----------------+-------------+----------------------+
| 20 | 11 | 2017-03-20 10:26:31 |
+-----------------+-------------+----------------------+
I basically need to pull the most recent Status_Code and Status_Timestamp based on the Status_Timestamp and then relate that to the first table with the Parent_Proposal column.
Is there a way to group a subset of results without grouping all of the data together?
Expected Result:
+----+--------+--------+-------+----------+----------+-------+--------+-------------+----------------------+
| ID | Prefix | Number | Inst. | CollCode | DeptCode | FName | LName | Status_Code | Status_Time |
+----+--------+--------+-------+----------+----------+-------+--------+-------------+----------------------+
| 18 | SYP | 4675 | T | AS | SOC | Linda | McGaff | 40 | 2016-11-09 06:30:35 |
+----+--------+--------+-------+----------+----------+-------+--------+-------------+----------------------+
| 20 | 11 | GEO | 4340 | AS | SGS | Teddy | Graham | 11 | 2017-03-20 10:26:31 |
+----+--------+--------+-------+----------+----------+-------+--------+-------------+----------------------+
Thanks for any help and insight!

Answer 1

I think you want this. Just join your two tables together, and then do an additional join to a subquery on the status table to find the latest record for each parent proposal.
SELECT
p.Proposal_ID,
SUBSTR(p.Proposal_Name, 1, 3) AS Prefix,
SUBSTR(p.Proposal_Name, 4, 6) AS Number,
p.Institution,
p.CollegeCode,
p.DepartmentCode,
p.Proposer_FirstName,
p.Proposer_LastName,
s1.Status_Code,
s1.Status_Time
FROM proposals.proposal p
LEFT JOIN proposals.status s1
ON p.ID = s1.Parent_Proposal
INNER JOIN
(
SELECT Parent_Proposal, MAX(Status_Time) AS Max_Status_Time
FROM proposals.status
GROUP BY Parent_Proposal
) s2
ON s1.Parent_Proposal = s2.Parent_Proposal AND s1.Status_Time = s2.Max_Status_Time
WHERE
p.Institution = 'T';