包装它们并使用子查询：
SELECt(SELECT COUNT(*) FROM Toys WHERe little_kid_id = 900)+(SELECt COUNT(*) from Games WHERe little_kid1 = 900 OR little_kid2 = 900 OR little_kid3 = 900)AS SumCount
瞧！
包装它们并使用子查询：
SELECt(SELECT COUNT(*) FROM Toys WHERe little_kid_id = 900)+(SELECt COUNT(*) from Games WHERe little_kid1 = 900 OR little_kid2 = 900 OR little_kid3 = 900)AS SumCount
瞧！
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