sql - How to query a table to get a sequence or chain of records? -

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i have table below

taskdel3gation

a user can assign tasks other user. other user in turn can assign his/her task user , on.

user assigning tasks identified task_assign_userid, , user receiving task identified task_rcv_userid.

users can assign tasks others specific period of time identified effective_date , expiration_date.

a user cannot assign task other user if other user has task in specified duration.

tasks/records filling behind current date treated inactive/completed tasks.

i want query table current active tasks given task_assign_userid. query should return record requested task_assign_userid, record if task_rcv_userid assigned task else. in turn if task_rcv_userid assigned user should return me record , on.

sample

task_assign_userid task_rcv_userid

a b

b c

c d

d e

....

....

i using db2 database. can please me? using loop in code retrieve records.

if cannot done using sql use pl/sql.

can please me?

updated:

task_assign_userid | task_rcv_user_id | effective_date | expiration_date

a | b | 10-11-2016 | 17-11-2016

b | c | 11-11-2016 | 16-11-2016

a | b | 12-11-2016 | 20-11-2016

b | c | 15-11-2016 | 18-11-2016

c | d | 15-11-2016 | 18-11-2016

should give me below, when task_assign_userid = a

task_assign_userid | task_rcv_user_id | effective_date | expiration_date

a | b | 12-11-2016 | 20-11-2016

b | c | 15-11-2016 | 18-11-2016

c | d | 15-11-2016 | 18-11-2016

should give me below, when task_assign_userid = b

task_assign_userid | task_rcv_user_id | effective_date | expiration_date

b | c | 15-11-2016 | 18-11-2016

c | d | 15-11-2016 | 18-11-2016

should give me below, when task_assign_userid = c

task_assign_userid | task_rcv_user_id | effective_date | expiration_date

c | d | 15-11-2016 | 18-11-2016

something this?

select task_assign_userid,task_rcv_user_id, max( effective_date)  effective_date, max (expiration_date) expiration_date youtable group task_assign_userid,task_rcv_user_id

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