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Set consolidation: Difference between revisions
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(H I K) (A B) (C D) (D B) (F G H)
==> (A C D B) (I K F G H)
</pre>
=={{header|SQL}}==
{{works with|ORACLE 19c}}
This is not a particularly efficient solution, but it gets the job done.
<lang SQL>
/*
This code is an implementation of "Set consolidation" in SQL ORACLE 19c
p_list_of_sets -- input string
delimeter by default "|"
*/
with
function set_consolidation(p_list_of_sets in varchar2)
return varchar2 is
--
v_list_of_sets varchar2(32767) := p_list_of_sets;
v_output varchar2(32767) ;
v_set_1 varchar2(2000) ;
v_set_2 varchar2(2000) ;
v_pos_set_1 pls_integer;
v_pos_set_2 pls_integer;
--
function remove_duplicates(p_set varchar2)
return varchar2 is
v_set varchar2(1000) := p_set;
begin
for i in 1..length(v_set)
loop
v_set := regexp_replace(v_set, substr(v_set, i, 1), '', i+1, 0) ;
end loop;
return v_set;
end;
--
begin
--cleaning
v_list_of_sets := ltrim(v_list_of_sets, '{') ;
v_list_of_sets := rtrim(v_list_of_sets, '}') ;
v_list_of_sets := replace(v_list_of_sets, ' ', '') ;
v_list_of_sets := replace(v_list_of_sets, ',', '') ;
--set delimeter "|"
v_list_of_sets := replace(v_list_of_sets, '}{', '|') ;
--
<<loop_through_sets>>
while regexp_count(v_list_of_sets, '[^|]+') > 0
loop
v_set_1 := regexp_substr(v_list_of_sets, '[^|]+', 1, 1) ;
v_pos_set_1 := regexp_instr(v_list_of_sets, '[^|]+', 1, 1) ;
--
<<loop_for>>
for i in 1..regexp_count(v_list_of_sets, '[^|]+')-1
loop
--
v_set_2 := regexp_substr(v_list_of_sets, '[^|]+', 1, i+1) ;
v_pos_set_2 := regexp_instr(v_list_of_sets, '[^|]+', 1, i+1) ;
--
if regexp_count(v_set_2, '['||v_set_1||']') > 0 then
v_list_of_sets := regexp_replace(v_list_of_sets, v_set_1, remove_duplicates(v_set_1||v_set_2), v_pos_set_1, 1) ;
v_list_of_sets := regexp_replace(v_list_of_sets, v_set_2, '', v_pos_set_2, 1) ;
continue loop_through_sets;
end if;
--
end loop loop_for;
--
v_output := v_output||'{'||rtrim(regexp_replace(v_set_1, '([A-Z])', '\1,'), ',') ||'}';
v_list_of_sets := regexp_replace(v_list_of_sets, v_set_1, '', 1, 1) ;
--
end loop loop_through_sets;
--
return replace(nvl(v_output,'{}'),'}{','},{') ;
end;
--Test
select lpad('{}',50) || ' ==> ' || set_consolidation('{}') as output from dual
union all
select lpad('{},{}',50) || ' ==> ' || set_consolidation('{},{}') as output from dual
union all
select lpad('{},{B}',50) || ' ==> ' || set_consolidation('{},{B}') as output from dual
union all
select lpad('{D}',50) || ' ==> ' || set_consolidation('{D}') as output from dual
union all
select lpad('{F},{A},{A}',50) || ' ==> ' || set_consolidation('{F},{A},{A}') as output from dual
union all
select lpad('{A,B},{B}',50) || ' ==> ' || set_consolidation('{A,B},{B}') as output from dual
union all
select lpad('{A,D},{D,A}',50) || ' ==> ' || set_consolidation('{A,D},{D,A}') as output from dual
union all
--Test RosettaCode
select '-- Test RosettaCode' as output from dual
union all
select lpad('{A,B},{C,D}',50) || ' ==> ' || set_consolidation('{A,B},{C,D}') as output from dual
union all
select lpad('{A,B},{B,D}',50) || ' ==> ' || set_consolidation('{A,B},{B,D}') as output from dual
union all
select lpad('{A,B},{C,D},{D,B}',50) || ' ==> ' || set_consolidation('{A,B},{C,D},{D,B}') as output from dual
union all
select lpad('{H, I, K}, {A,B}, {C,D}, {D,B}, {F,G,H}',50) || ' ==> ' || set_consolidation('{H, I, K}, {A,B}, {C,D}, {D,B}, {F,G,H}') as output from dual
union all
select lpad('HIK|AB|CD|DB|FGH',50) || ' ==> ' || set_consolidation('HIK|AB|CD|DB|FGH') as output from dual
;
/
</lang>
{{out}}
<pre>
{} ==> {}
{},{} ==> {}
{},{B} ==> {B}
{D} ==> {D}
{F},{A},{A} ==> {F},{A}
{A,B},{B} ==> {A,B}
{A,D},{D,A} ==> {A,D}
-- Test RosettaCode
{A,B},{C,D} ==> {A,B},{C,D}
{A,B},{B,D} ==> {A,B,D}
{A,B},{C,D},{D,B} ==> {A,B,D,C}
{H, I, K}, {A,B}, {C,D}, {D,B}, {F,G,H} ==> {H,I,K,F,G},{A,B,D,C}
HIK|AB|CD|DB|FGH ==> {H,I,K,F,G},{A,B,D,C}
</pre>
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