Problem: There is a table with one column. Concatenate the rows of this column.
create table characters(ch varchar2(1));
insert into characters values ('A');
insert into characters values ('B');
insert into characters values ('C');
insert into characters values ('D');
Solution:
select concatenated
from
(
select concatenated
from
(
select replace(sys_connect_by_path (ch,' '),' ','') concatenated
from
(
select ch,rownum rn from characters
)
CONNECT BY PRIOR rn = rn -1
)
order by length(concatenated) desc
)
where rownum=1
negative regexp
-
if you want to grep anything except foo, use grep -v or negative lookahead
echo -e 'foo\nbar\nboz'|grep -P '^(?!.*foo).*$' bar boz it is just so
beautiful ...
1 month ago
1 comment:
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