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SELECT k
from (
SELECT 'shanghai' AS k from DUAL
UNION ALL
SELECT 'dalian' AS k from DUAL
UNION ALL
SELECT 'beijing' AS k from DUAL
)
ORDER BY CASE
WHEN k = 'beijing'
THEN 1
WHEN k = 'dalian'
THEN 3
WHEN k = 'shanghai'
THEN 2
END
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