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1. ¼òµ¥CASE±í´ïʽ,ʹÓñí´ïʽȷ¶¨·µ»ØÖµ.
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WHEN expressionN THEN resultN
ELSE default_result
END
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select product_id,product_type_id,
case product_type_id
when 1 then 'Book'
when 2 then 'Video'
when 3 then 'DVD'
when 4 then 'CD'
else 'Magazine'
end
from products
½á¹û:
PRODUCT_ID PRODUCT_TYPE_ID CASEPROD
---------- --------------- --------
         1               1                             Book
         2               1                             Book
         3               2                              Video
         4               2             &


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