I want to display the jobs running on different clusters using SQL - sql

Question

There are two tables job table and cluster table.Every cluster will have the different sub clusters.
LIKE
Main cluster
cluster1 cluster2 cluster3
--------------------------------------
job1 job15 job 20
. .
.
.
j14
1st cluster will have 14 jobs
2nd cluster will have 5 jobs
3rd cluster will have 5 jobs
Now I want to display the jobs running on different clusters (Including sub clusters) using PostgreSQL.
My table structure as follows
CREATE TABLE clusterdata(
clusterid bigint NOT NULL,
sourceclustername character varying NOT NULL,
clustername character varying NOT NULL
);
CREATE TABLE job(
clusterid bigint NOT NULL,
jobname character varying NOT NULL,
sourcecluster bigint
);
Please help me...Thanx in advance

Answer 1

Assuming your sentence "1st cluster will have 14 jobs 2nd cluster will have 5 jobs 3rd cluster will have 5 jobs"
you can use something like this:
WITH BASE AS (
SELECT * , ROW_NUMBER() OVER (PARTITION BY sourcecluster, clusterid ORDER BY clusterid, jobname) AS RN
, DENSE_RANK() OVER (PARTITION BY sourcecluster ORDER BY clusterid) * CASE WHEN sourcecluster=0 THEN 0 ELSE 1 END AS RN_GROUP
FROM job )
SELECT A.clusterid AS SOURCE_CLUSTER, A.jobname AS CLUSTER_1
, B.jobname AS CLUSTER_2
, C.jobname AS CLUSTER_3
FROM BASE A
LEFT JOIN BASE B ON B.sourcecluster = A.clusterid AND B.RN_group=1 AND A.RN=B.RN
LEFT JOIN BASE C ON C.sourcecluster = A.clusterid AND C.RN_group=2 AND B.RN=C.RN
WHERE A.sourcecluster=0
ORDER BY A.clusterid, A.RN, B.RN;
Output:
source_cluster cluster_1 cluster_2 cluster_3
1 1 job1 job15 job20
2 1 job2 job16 job21
3 1 job3 job17 job22
4 1 job4 job18 NULL
5 1 job5 NULL NULL
6 4 job41 NULL NULL
7 4 job42 NULL NULL
8 4 job43 NULL NULL
9 4 job44 NULL NULL
10 4 job45 NULL NULL
11 5 job51 job55 NULL
12 5 job52 job56 NULL
13 5 job53 job57 NULL
14 5 job54 job58 NULL
15 5 job55 NULL NULL
Sample data:
INSERT INTO clusterdata VALUES (1, '0', 'clust1');
INSERT INTO clusterdata VALUES (2, 'clust1', 'clust1.1');
INSERT INTO clusterdata VALUES (3, 'clust1', 'clust1.2');
INSERT INTO clusterdata VALUES (4, '0', 'clust2');
INSERT INTO clusterdata VALUES (5, '0', 'clust3');
INSERT INTO clusterdata VALUES (6, 'clust3', 'clust3.1');
INSERT INTO job VALUES (1,'job1',0);
INSERT INTO job VALUES (1,'job2',0);
INSERT INTO job VALUES (1,'job3',0);
INSERT INTO job VALUES (1,'job4',0);
INSERT INTO job VALUES (1,'job5',0);
INSERT INTO job VALUES (2,'job15',1);
INSERT INTO job VALUES (2,'job16',1);
INSERT INTO job VALUES (2,'job17',1);
INSERT INTO job VALUES (2,'job18',1);
INSERT INTO job VALUES (3,'job20',1);
INSERT INTO job VALUES (3,'job21',1);
INSERT INTO job VALUES (3,'job22',1);
INSERT INTO job VALUES (4,'job41',0);
INSERT INTO job VALUES (4,'job42',0);
INSERT INTO job VALUES (4,'job43',0);
INSERT INTO job VALUES (4,'job44',0);
INSERT INTO job VALUES (4,'job45',0);
INSERT INTO job VALUES (5,'job51',0);
INSERT INTO job VALUES (5,'job52',0);
INSERT INTO job VALUES (5,'job53',0);
INSERT INTO job VALUES (5,'job54',0);
INSERT INTO job VALUES (5,'job55',0);
INSERT INTO job VALUES (6,'job55',5);
INSERT INTO job VALUES (6,'job56',5);
INSERT INTO job VALUES (6,'job57',5);
INSERT INTO job VALUES (6,'job58',5);