A,B,C三个表，一共1000条数据，如何让其随机选择60条（平均分配A,B,C三表的数据）放在datagridview中
如题，在线等

[解决办法]
SELECT * FROM (SELECT TOP 60 *, NewId() As RandomX FROM [A] Order By RandomX) AA
UNION ALL
SELECT * FROM (SELECT TOP 60 *, NewId() As RandomX FROM [B] Order By RandomX) BB
UNION ALL
SELECT * FROM (SELECT TOP 60 *, NewId() As RandomX FROM [C] Order By RandomX) CC


A,B,C字段名称必须相同

参见
http://dotnet.aspx.cc/file/Using-UNION-ALL-With-ORDER-BY-NEWID.aspx