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select sum(field1) as r from table1 r is null 如何让r变成0 select isnull(sum(field1),0) as r from table1 r 不在是null，而是0 |
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select sum(field1) as r from table1 r is null 如何让r变成0 select isnull(sum(field1),0) as r from table1 r 不在是null，而是0 |
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