[Solved] System.Data.SqlClient.SqlException: Ambiguous column name

indradeo

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User: indradeo
Posted: on Jun 20, 2022 06:54 AM
Forum: ASP.Net Web Forms
Answer: 1
Views: 2897

Server Error in '/' Application.

Ambiguous column name 'dt'. Ambiguous column name 'dt'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Ambiguous column name 'dt'. Ambiguous column name 'dt'. Source Error:

Line 71:                         using (DataTable dt = new DataTable())
Line 72:                         {
Line 73:                             sda.Fill(dt);
Line 74:                             GridView1.DataSource = dt;
Line 75:                             GridView1.DataBind();

Source File: c:\Users\Administrator\Documents\Visual Studio 2012\Projects\sfty1\sfty1\smmry_emp.aspx.cs Line: 73 Stack Trace:

[SqlException (0x80131904): Ambiguous column name 'dt'.
Ambiguous column name 'dt'.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +2582954
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +6034042
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +297
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4291
   System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +59
   System.Data.SqlClient.SqlDataReader.get_MetaData() +91
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted) +446
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest) +2698
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) +1611
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +65
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +251
   System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +43
   System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +12
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +140
   System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162
   System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +111
   sfty1.smmry_emp.BindGrid() in c:\Users\Administrator\Documents\Visual Studio 2012\Projects\sfty1\sfty1\smmry_emp.aspx.cs:73
   sfty1.smmry_emp.Page_Load(Object sender, EventArgs e) in c:\Users\Administrator\Documents\Visual Studio 2012\Projects\sfty1\sfty1\smmry_emp.aspx.cs:54
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4494.0

namespace sfty1
{
    public partial class smmry_emp : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindGrid();
            }
        }

        private void BindGrid()
        {
            string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand("select DISTINCT a.emp_id,a.emp_nm,a.dept,a.agncy,a.lcn,a.dsc,c.prtcpnt,d.cmplnc,e.ttc,a.dt,a.mnth from nmr a,emp b,pptlk c,sdor d,ttc e  WHERE dt BETWEEN @Start and @End"))
                {
                    cmd.Parameters.AddWithValue("@Start", txtStartDate.Text.Trim());
                    cmd.Parameters.AddWithValue("@End", txtEndDate.Text.Trim());
                    using (SqlDataAdapter sda = new SqlDataAdapter())
                    {
                        cmd.Connection = con;
                        sda.SelectCommand = cmd;
                        using (DataTable dt = new DataTable())
                        {
                            sda.Fill(dt);
                            GridView1.DataSource = dt;
                            GridView1.DataBind();
                        }
                    }
                }
            }
        }
    }
}

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dharmend...

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User: dharmendr
Replied: on Jun 20, 2022 06:58 AM
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indradeo says:

using (SqlCommand cmd = new SqlCommand("select DISTINCT a.emp_id,a.emp_nm,a.dept,a.agncy,a.lcn,a.dsc,c.prtcpnt,d.cmplnc,e.ttc,a.dt,a.mnth from nmr a,emp b,pptlk c,sdor d,ttc e  WHERE dt BETWEEN @Start and @End"))

dt column exists in more than one tables. In that case you must have to specify from which table you are selecting column.

So, you need to specify the alias before the column name.

Replace above code with below.

using (SqlCommand cmd = new SqlCommand("select DISTINCT a.emp_id,a.emp_nm,a.dept,a.agncy,a.lcn,a.dsc,c.prtcpnt,d.cmplnc,e.ttc,a.dt,a.mnth from nmr a,emp b,pptlk c,sdor d,ttc e  WHERE a.dt BETWEEN @Start and @End"))

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[Solved] System.Data.SqlClient.SqlException: Ambiguous column name

Server Error in '/' Application.

Ambiguous column name 'dt'. Ambiguous column name 'dt'.

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