获取字符串值作为时差的Sql查询

我对存储为字符串的时间有如下要求：

    ID - FromTime - ToTime - Day - RoomNo
      1 - 10:00 AM - 11:00 AM - Sun - 202
      2 - 11:00 AM - 12:00 AM - Sun - 203

所以我要做的是在表格中检查，一个房间在指定的时间内被分配了，就像如果一个房间是在太阳的上午10:00到11:00分配的，那么在指定的一天的那个时间，就没有其他的时间表了。它不能像上午10:20到11:00那样重叠。从上午10:00开始，已经有一个时间表。同样，我必须确保在特定的一天（太阳）的其他时间表，如上午11:00至12:00也可用。这只是进行验证所必需的

就是这样。我正在尝试用SQL查询来实现它，希望它会很简单。所以尝试了一个不够好的查询（只是为了演示）：

选择*
从eRoom
哪里
转换（时间，FromTime）>=转换（时间，“上午10:00”）
和CONVERT（Time，ToTime）这是我们尝试实现的以下内容，几乎可以正常工作：

    string scheduleTime = "";
    bool found = false;

    foreach (AllocateRoom allocate in allocatedRooms)
    {
        DateTime existingFromTime = Convert.ToDateTime(allocate.FromTime);
        DateTime existingToTime = Convert.ToDateTime(allocate.ToTime);

        bool matchRoom = allocate.RoomNo == aAllocateRoom.RoomNo;
        bool matchDay = allocate.Day == aAllocateRoom.Day;

        bool matchFromTime = existingFromTime == nFromTime;
        bool matchToTime = existingToTime == nToTime;

        bool coverExistingRange = nFromTime < existingFromTime & nToTime > existingFromTime;
        bool coverExistingRange2 = nFromTime < existingToTime & nToTime > existingToTime;

        bool toTimeInTheRange = nToTime > existingFromTime & nToTime < existingToTime;
        bool fromTimeInTheRange = nFromTime > existingFromTime & nFromTime < existingToTime;

        bool matchTime = matchFromTime || matchToTime;
        bool coverTime = coverExistingRange || coverExistingRange2;
        bool overlapTime = toTimeInTheRange || fromTimeInTheRange;

        if (matchRoom & matchDay & (matchTime || overlapTime || coverTime))
        {
            scheduleTime = "Room " + allocate.RoomNo + " - " + allocate.Day + " " + allocate.FromTime + " - " + allocate.ToTime;
            found = true;
        }
    }

    if (found)
    {
        message = scheduleTime + " has been already scheduled!";
        return message;
    }

string scheduleTime=”“；
bool-found=false；
foreach（AllocateeRoom在allocatedRooms中分配）
{
DateTime existingFromTime=Convert.ToDateTime（allocate.FromTime）；
DateTime existingToTime=Convert.ToDateTime（allocate.ToTime）；
bool matchRoom=allocate.RoomNo==aaallocateroom.RoomNo；
bool matchDay=allocate.Day==aaallocateroom.Day；
bool matchFromTime=existingFromTime==nFromTime；
bool matchToTime=existingToTime==nToTime；
bool coverExistingRange=nFromTimeexistingFromTime；
bool cover existingrange 2=nFromTimeexistingToTime；
bool totimeintrange=nToTime>existingFromTime&nToTimeexistingFromTime&nFromTime
我们尝试实现了以下功能，并且几乎可以正常工作：

    string scheduleTime = "";
    bool found = false;

    foreach (AllocateRoom allocate in allocatedRooms)
    {
        DateTime existingFromTime = Convert.ToDateTime(allocate.FromTime);
        DateTime existingToTime = Convert.ToDateTime(allocate.ToTime);

        bool matchRoom = allocate.RoomNo == aAllocateRoom.RoomNo;
        bool matchDay = allocate.Day == aAllocateRoom.Day;

        bool matchFromTime = existingFromTime == nFromTime;
        bool matchToTime = existingToTime == nToTime;

        bool coverExistingRange = nFromTime < existingFromTime & nToTime > existingFromTime;
        bool coverExistingRange2 = nFromTime < existingToTime & nToTime > existingToTime;

        bool toTimeInTheRange = nToTime > existingFromTime & nToTime < existingToTime;
        bool fromTimeInTheRange = nFromTime > existingFromTime & nFromTime < existingToTime;

        bool matchTime = matchFromTime || matchToTime;
        bool coverTime = coverExistingRange || coverExistingRange2;
        bool overlapTime = toTimeInTheRange || fromTimeInTheRange;

        if (matchRoom & matchDay & (matchTime || overlapTime || coverTime))
        {
            scheduleTime = "Room " + allocate.RoomNo + " - " + allocate.Day + " " + allocate.FromTime + " - " + allocate.ToTime;
            found = true;
        }
    }

    if (found)
    {
        message = scheduleTime + " has been already scheduled!";
        return message;
    }

string scheduleTime=”“；
bool-found=false；
foreach（AllocateeRoom在allocatedRooms中分配）
{
DateTime existingFromTime=Convert.ToDateTime（allocate.FromTime）；
DateTime existingToTime=Convert.ToDateTime（allocate.ToTime）；
bool matchRoom=allocate.RoomNo==aaallocateroom.RoomNo；
bool matchDay=allocate.Day==aaallocateroom.Day；
bool matchFromTime=existingFromTime==nFromTime；
bool matchToTime=existingToTime==nToTime；
bool coverExistingRange=nFromTimeexistingFromTime；
bool cover existingrange 2=nFromTimeexistingToTime；
bool totimeintrange=nToTime>existingFromTime&nToTimeexistingFromTime&nFromTime
MS SQL Server 2008（及更高版本）允许此转换。您尝试的查询有什么问题？当范围超过午夜时，您会遇到问题。你必须在逻辑上使用星期几。然后，当然，你仍然有星期六到星期日考虑当周开始。您存储了多少天的数据？关于重叠范围的问题：您也可以找到关于该主题的许多其他页面。上述查询仅适用于一个示例：上午10:00到11:00。但它不检查上午10:01到11:00。即使在上午10:00到上午11:00之间的时间安排在表中，它也会重叠。MS SQL Server 2008（及更新版本）允许此转换。您尝试的查询有什么问题？当范围超过午夜时，您会遇到问题。你必须在逻辑上使用星期几。然后，当然，你仍然有星期六到星期日考虑当周开始。您存储了多少天的数据？关于重叠范围的问题：您也可以找到关于该主题的许多其他页面。上述查询仅适用于一个示例：上午10:00到11:00。但它不检查上午10:01到11:00。即使在上午10:00到11:00之间，表格中的时间表也会重叠。