Olá à lista,

Como faço para evitar resultados null de esta seleçao:

SELECT c0-(c1+c2+c3+c4) FROM t1;

c0;c1;c2;c3;c4
"07:01:13";"";"";"";""
"06:50:22";"";"";"";""
"07:09:11";"";"";"";""
"07:28:58";"00:28:00";"";"";""
"11:19:04";"";"";"";"01:33:00"
"08:09:24";"";"";"00:27:46";""
"06:44:13";"";"03:40:36";"";""
"07:01:47";"";"";"";""
"07:06:07";"00:14:00";"";"";""
"07:59:49";"";"";"00:30:16";""
"07:00:38";"";"";"";""
"11:05:59";"";"";"00:35:49";""
"07:05:39";"";"";"";""
"06:50:45";"00:14:00";"";"";""
"07:12:36";"";"";"";""
"07:24:36";"";"";"";""
"10:26:16";"";"";"00:32:46";""
"09:03:10";"";"";"01:50:19";""
"06:56:40";"";"";"";""
"08:06:59";"";"";"00:24:06";""

Gostaria que o resultado de 10:00:00-(01:00:00+null+null+null) = 09:00:00

Obrigado,

Eloi Ribeiro
GIS Analyst
39,45º -4,40º
http://eloiribeiro.wordpress.com
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