search by substring in documentDB

Question

this is the sample documentDB document,

I want to get all the documents who failed in one or more subjects

I found something like

SELECT 
    *
FROM students s 
JOIN c IN s.subjects 
WHERE c.result = "pass"

I want to retrieve by using c# code

{
  "id": "0066a253-f042-4213-b06e-65b1ea1e49aa",
  "name": "Sunny",
  "rollNo": 123,
  "class": "2nd",
  "section": "B",
  "Department": {
    "name": "CSE",
    "id": "cse",
    "subjects": [
      {
        "id": "subject-1",
        "marksObtained": 66,
        "maxMarks": 100,
        "result": "pass"
      },
      {
        "id": "subject-2",
        "marksObtained": 56,
        "maxMarks": 75,
        "result": "pass"
      },
      {
        "id": "subject-3",
        "marksObtained": 22,
        "maxMarks": 100,
        "result": "fail"
      },
      {
        "id": "subject-4",
        "marksObtained": 36,
        "maxMarks": 50,
        "result": "pass"
      },
      {
        "id": "subject-5",
        "marksObtained": 16,
        "maxMarks": 100,
        "result": "fail"
      }
    ]
  },
  "Type": "Student"
}

i tried like this

var result = client.CreateDocumentQuery<dynamic>(dc.SelfLink, "SELECT s.id as id,s.Name as Name,s.Age as Age,s.section as section,s.subjects as subjects FROM students s JOIN c IN s.subjects WHERE c.result = \"pass\"").ToList(); 

List<Student> students = new List<Student>(); 
foreach(var std in result) 
{ 
     students.Add((Student)std); 
} 

Something like above is my code I am getting, but Even I give pa or pas or pass or p or ass or as then also I should get something I need a functionality of LIKE in SQL

Is there any solution for this?? I need LIKE functionality in SQL to retrieve data from documentDB

Answer 1

Update: As of 5/6/15, DocumentDB added a set of String functions including STARTSWITH, ENDSWITH, and CONTAINS. Please note that most of these functions do not run on the index and will force a scan.

Wildcards like SQL's LIKE '% %' has not been implemented in DocumentDB yet.

Please voice your opinion and vote for this feature on DocumentDB's feedback forum.

Answer 2

Some new functions have been introduced in the last few months. For you particular case I think you can use:

WHERE STARTSWITH(c.result, "p")