Oracle 11g Release 2

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create table da as (
    select 20200201 id_date, 157 prev_bal, 192 curr_bal from dual
    union all select 20200201 id_date, 192 prev_bal, 195 curr_bal from dual
    union all select 20200201 id_date, 123 prev_bal, 124 curr_bal from dual
    union all select 20200201 id_date, 124 prev_bal, 157 curr_bal from dual
    union all select 20200201 id_date, 125 prev_bal, 123 curr_bal from dual );
5 rows affected

    select da.*, sys_connect_by_path(curr_bal, ' - ') path
      from da 
      connect by prior prev_bal = curr_bal 
      start with not exists (select 1 from da t where t.prev_bal = da.curr_bal)      


ID_DATE
PREV_BAL
CURR_BAL
PATH


20200201
192
195
 - 195

20200201
157
192
 - 195 - 192

20200201
124
157
 - 195 - 192 - 157

20200201
123
124
 - 195 - 192 - 157 - 124

20200201
125
123
 - 195 - 192 - 157 - 124 - 123


    select * from da 
      where not exists (select 1 from da t where t.prev_bal = da.curr_bal)


ID_DATE
PREV_BAL
CURR_BAL


20200201
192
195


    select da.*, sys_connect_by_path(curr_bal, ' - ') path
      from da 
      where connect_by_isleaf = 1
      connect by prev_bal = prior curr_bal 
      start with not exists (select 1 from da t where da.prev_bal = t.curr_bal)


ID_DATE
PREV_BAL
CURR_BAL
PATH


20200201
192
195
 - 123 - 124 - 157 - 192 - 195

ID_DATE	PREV_BAL	CURR_BAL	PATH
20200201	192	195	- 195
20200201	157	192	- 195 - 192
20200201	124	157	- 195 - 192 - 157
20200201	123	124	- 195 - 192 - 157 - 124
20200201	125	123	- 195 - 192 - 157 - 124 - 123