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The iteratee is passed three arguments: the value, then the index (or key) of the iteration, and finally a reference to the entire list.
SELECT CASE WHEN condition THEN true-part ELSE false-part END; (P) SELECT CASE
select user from dual #当前用户 SELECT banner FROM v$version WHERE banner LIKE 'Oracle%'; #oracle版本 select wmsys.wm_concat.
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