Question

please consider this scenario:

I have a table like this:

ID              City            Status
--------------------------------------
 1               1                1
 2               1                1
 3               1                1
 4               2                1
 5               2                0
 6               3                1
 7               3                1
 8               3                1
 9               3                1
 10              4                3
 11              4                1
 12              4                0

I want to return Citis that all records that related to that city have Status=1 and if one of that records has Status<>1 that city exclude from reslut set. in this scenarion I want to return cities : 1 , 3.

How I can do this with Sql Query or LINQ query?

thanks

Answer 1

Something like this should do it.

LINQ:

var citiesToExclude = context.Table
    .Where(t => t.Status != 1)
    .Select(t => t.City);
var cities = context.Table
    .Where(t => t.Status == 1)
    .Where(t => !citiesToExclude.Contains(t.City))
    .Select(t => t.City)
    .Distinct()
    .ToList();

SQL:

SELECT City
FROM [Table]
WHERE Status == 1
  AND City NOT IN (SELECT City FROM [Table] WHERE Status <> 1)
GROUP BY City

Hope this helps.