SELECT ORDNO,CUSNO,
CASE MONTH(SHIPDATE)
WHEN ''01'' THEN ''Jan''
WHEN ''02'' THEN ''Feb''
WHEN ''03'' THEN ''Mar''
WHEN ''04'' THEN ''Apr''
WHEN ''05'' THEN ''May''
WHEN ''06'' THEN ''Jun''
WHEN ''07'' THEN ''Jul''
WHEN ''08'' THEN ''Aug''
WHEN ''09'' THEN ''Sep''
WHEN ''10'' THEN ''Oct''
WHEN ''11'' THEN ''Nov''
WHEN ''12'' THEN ''Dec''
END
FROM FILE
应用实例：
Oracle SQL：
-------------------------
select decode(t.organtypecode, ''D'', t.parent, ''S'', t.parent, t.id)
from A_ORGAN t
where t.parent = 35
DB2 SQL：
-------------------------
select case x.organtypecode
when ''D'' then
x.parent
when ''S'' then
x.parent
else
x.id
end
from a_Organ x
where x.parent = 35;
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