How to duplicate and merge rows through select query - sql

Question

I've an existing Postgresql select query output that gives me,
+------+------------+------+------+
| Type | ID | Pass | Fail |
+------+------------+------+------+
| IQC | ABC_IQC_R2 | 0 | 6 |
+------+------------+------+------+
| IQC | ABC_IQC_R1 | 2 | 6 |
+------+------------+------+------+
| IQC | ABC_IQC | 498 | 8 |
+------+------------+------+------+
How do I duplicate the row of ID-> ABC_IQC into two while merging both R1 & R2 values into that row? (As shown below)
+------+---------+------------+------+------+--------+--------+
| Type | ID | R_ID | Pass | Fail | R_Pass | R_Fail |
+------+---------+------------+------+------+--------+--------+
| IQC | ABC_IQC | ABC_IQC_R2 | 498 | 8 | 0 | 6 |
+------+---------+------------+------+------+--------+--------+
| IQC | ABC_IQC | ABC_IQC_R1 | 498 | 8 | 2 | 6 |
+------+---------+------------+------+------+--------+--------+
The two logics I can think of is,
Run through the ID to search for ABC (But I'm unsure of how to match them). Duplicate the row ABC_IQC & then merge them using Lateral Join (Still unsure how)
Duplicate a column for ABC_IQC(ID column) from both R2 & R1 (now becoming R_ID). Search ID for the original ABC_IQC row and extract the value of pass and fail into both R2 & R1 row.
Here is my current query to get the initial query output,
SELECT
split_part(NewLotID, '_', 2) AS "Type",
LotSummary ->> 'ID' AS "ID",
LotSummary ->> 'Pass' AS "Pass",
LotSummary ->> 'Fail' AS "Fail"
FROM
(
SELECT
LotSummary,
regexp_replace(LotSummary ->> 'ID','[- ]','_','g') AS NewLotID
.
.
.
I'm not expecting a full answer because I've hardly provided any code, just any ideas or insights that might be helpful! Thank you in advance.

Answer 1

I think you want join:
with q as (
<your query here>
)
select q.type, q.id, qr.id as r_id, q.pass, q.fail,
qr.pass as r_pass, qr.fail as r_fail
from q join
q qr
on q.id = 'ABC_IQC' and qr.id like 'ABC_IQC_%';
You can actually generalize this:
with q as (
<your query here>
)
select q.type, q.id, qr.id as r_id, q.pass, q.fail,
qr.pass as r_pass, qr.fail as r_fail
from q join
q qr
on q.id ~ '^[^_]+_[^_]+$' and
qr.id like q.id || '_%';