Databases
StackOverflow2013
Postsdbo
POLeft join is not working for complex query
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POLeft join is not working for complex query
    primarykey
    data
    text
    <p>I have very complex linq query which is working fine for inner join, i.e., without <code>z_temp.DefaultIfEmpty()</code>. But when I use this for left join, The query is not yielding results.</p> <pre><code>var q = from x in db.EmployeesList where x.EmployeesListStartDate &gt;= startDate &amp;&amp; x.EmployeesListStartDate &lt;= endDate join y in db.Survey on x.Survey.SurveyID equals y.SurveyID join z in (from a in db.Commit join b in (from commit in db.Commit where commit.CommitListID != null &amp;&amp; commit.CommitType.ToUpper() != "PREVIEW" group commit by new { commit.CommitListID } into g select new { CommitListID = (Int32?)g.Key.CommitListID, CommitId = (Int32?)g.Max(p =&gt; p.CommitId) }) on new { a.CommitListID, a.CommitId } equals new { b.CommitListID, CommitId = (Int32)b.CommitId } select new { CommitListID = (Int32?)a.CommitListID, CommitUsername= a.CommitUsername, CommitStartDateTime=a.CommitStartDateTime, CommitType=a.CommitType, CommitSuccessCount=a.CommitSuccessCount }) on new { EmployeesListID = x.EmployeesListID } equals new { EmployeesListID = (Int32)z.CommitListID } into z_temp from _z in z_temp.DefaultIfEmpty() select new CustomEmployeesList { SurveyId = x.Survey.SurveyID != null ? (int)x.Survey.SurveyID : 0, EmployeesListId = x.EmployeesListID != null ? (int)x.EmployeesListID : 0, EmployeesListName = x.EmployeesListName, SpecificMessage = x.SpecificMessage, ListCriteria = x.ListCriteria, Channel = x.Channel, EmployeesListStartDate = (DateTime)x.EmployeesListStartDate, EmployeesListEndDate = (DateTime)x.EmployeesListEndDate, Records = x.Records != null ? (int)x.Records : 0, QueryId = x.AppSqlQueries.QueryId != null ? (int)x.AppSqlQueries.QueryId : 0, //AuditId = (Int32?)x.AuditEntry.AuditId, StatusCommonCode = x.CommonCode.CommonCodeId != null ? (int)x.CommonCode.CommonCodeId : 0, SurveyName = y.SurveyName, LastCommitDateTime = _z.CommitStartDateTime.HasValue ? (DateTime)_z.CommitStartDateTime : DateTime.MinValue, LastCommitType = _z.CommitType != null ? _z.CommitType : "", LastCommitUsername = _z.CommitUsername != null ? _z.CommitUsername : "", LastCommitCount = _z.CommitSuccessCount.HasValue ? (int)_z.CommitSuccessCount : 0 }; </code></pre> <p>This is returning no results and I am getting this exception message while viewing results in debug mode:</p> <blockquote> <p>LINQ to Entities does not recognize the method 'System.Collections.Generic.IEnumerable1[&lt;>f_<em>AnonymousType351[&lt;>f</em>_AnonymousType35%5bSystem.Nullable1[System.Int32],System.String,System.Nullable1%5bSystem.DateTime%5d,System.String,System.Nullable`1%5bSystem.Int32%5d%5d%5d">System.Nullable1[System.Int32],System.String,System.Nullable1[System.DateTime],System.String,System.Nullable1[System.Int32]]] DefaultIfEmpty[&lt;>f__AnonymousType35' method, and this method cannot be translated into a store expression.</p> </blockquote> <p>Can anyone suggest the where the problem would be, this would be really helpful!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USabatishchev
    1. USstak
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POLeft join is not working for complex query
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
      singulars
      1. POLeft join is not working for complex query
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe error seems to come from this line: `from _z in z_temp.DefaultIfEmpty()` What are you trying to do there?
      singulars
      1. POLeft join is not working for complex query
      1. USmagnattic
    2. COYes I want to left join with the EmployeesList table
      singulars
      1. POLeft join is not working for complex query
      1. USstak
    3. COassuming the complexity of your database you should use Entity Framework with linq to entity. I have never seen nothing like that before..
      singulars
      1. POLeft join is not working for complex query
      1. USJaime Yule
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload