sql 有记录返回1，无记录返回0

  方案一sql 只返回数字code SELECT DISTINCT IF(EXISTS(SELECT 1 FROM tb WHERE id=1), 1, 0) AS res FROM tb; 做为另外一条sql赋值blog SELECT tb2.*， IF(EXISTS(SELECT 1 FROM tb WHERE id=1), 1, 0) AS res FROM tb2;   方案二class

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