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from£¨select * from bookA
union
select * from bookB
) b
where bookSTime between b.a_sTime and b.a_eTime
or bookETime between b.a_sTime and b.a_eTime
group by b.a_rtId
having tmpCount > bookNum - 1


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C# code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Runtime.InteropServices;
nam ......
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