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select sem valores


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estou com a seguinte dúvida, o meu select pode não retornar qualquer valor devido ao where, então gostaria que nesses casos que apresentá se uma mensagem. Para isso estou a usar um case.


select Case  when teste is null then 'ola' else teste end (
from tabela1 where campo1=23

Será que me poderão ajudar??

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