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(SELECT a,b from (SELECT CITY as a,char_length(CITY) as b from STATION order by b asc, a asc ) as k LIMIT 1) UNION (SELECT a,b from (SELECT CITY as a,char_length(CITY) as b from STATION order by b desc, a asc ) as k LIMIT 1)
*
ERROR at line 1:
ORA-00907: missing right parenthesis
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Weather Observation Station 5
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Even with your query, union won't work:
(SELECT a,b from (SELECT CITY as a,char_length(CITY) as b from STATION order by b asc, a asc ) as k LIMIT 1) UNION (SELECT a,b from (SELECT CITY as a,char_length(CITY) as b from STATION order by b desc, a asc ) as k LIMIT 1) * ERROR at line 1: ORA-00907: missing right parenthesis