uso de caso en ejemplo de código mysql

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Ejemplo 1: caso de mysql

-- LABEL MOVIE LENGTH select title, length,CASEwhen length <50then'very short film'when length <90then'short film'when length <120then'medium length film'when length >120then'long film'else'unknown length'END-- AS film_lengthfrom film;-- SAME AS ABOVE BUT ON A CUSTOM NAMED COLUMNselect title, length,CASEwhen length <50then'very short film'when length <90then'short film'when length <120then'medium length film'when length >120then'long film'else'unknown length'ENDAS film_length
from film;-- RESULT+-----------------------------+--------+--------------------+| title                       | length | film_length        |+-----------------------------+--------+--------------------+| ACADEMY DINOSAUR            |86| short film         || ACE GOLDFINGER              |48| very short film    || ADAPTATION HOLES            |50| short film         || AFFAIR PREJUDICE            |117| medium length film || AFRICAN EGG                 |130| long film          || AGENT TRUMAN                |169| long film          || AIRPLANE SIERRA             |62| short film         || AIRPORT POLLOCK             |54| short film         || ALABAMA DEVIL               |114| medium length film || ALADDIN CALENDAR            |63| short film         || ALAMO VIDEOTAPE             |126| long film          || ALASKA PHANTOM              |136| long film          || ALI FOREVER                 |150| long film          || ALICE FANTASIA              |94| medium length film || ALIEN CENTER                |46| very short film    |

Ejemplo 2: caso de conmutador mysql

SELECT 
t2.company_name,
t2.expose_new,
t2.expose_used,
t1.title,
t1.status,CASEstatuswhen'New'and t2.expose_new =1then1when'New'and t2.expose_new =2then2when'New'and t2.expose_new =3then3when'Used'and t2.expose_used =1then1when'Used'and t2.expose_used =2then2when'Used'and t2.expose_used =3then3ENDas expose
FROM`products` t1
join manufacturers t2 on t2.id = t1.seller
where t1.seller =4238

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