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SqlExpressionTests.cs
674 lines (528 loc) · 24.1 KB
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SqlExpressionTests.cs
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using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using NUnit.Framework;
using ServiceStack.DataAnnotations;
using ServiceStack.OrmLite.Tests.UseCase;
using ServiceStack.Text;
namespace ServiceStack.OrmLite.Tests.Expression;
public class LetterFrequency
{
[AutoIncrement]
public int Id { get; set; }
public string Letter { get; set; }
[Alias("AliasValue")]
public int Value { get; set; }
}
public class LetterWeighting
{
public long LetterFrequencyId { get; set; }
public int Weighting { get; set; }
}
public class LetterStat
{
[AutoIncrement]
public int Id { get; set; }
public long LetterFrequencyId { get; set; }
public string Letter { get; set; }
public int Weighting { get; set; }
}
[TestFixtureOrmLite]
public class SqlExpressionTests : ExpressionsTestBase
{
public SqlExpressionTests(DialectContext context) : base(context) {}
private int letterFrequencyMaxId;
private int letterFrequencyMinId;
private int letterFrequencySumId;
private void GetIdStats(IDbConnection db)
{
letterFrequencyMaxId = db.Scalar<int>(db.From<LetterFrequency>().Select(Sql.Max("Id")));
letterFrequencyMinId = db.Scalar<int>(db.From<LetterFrequency>().Select(Sql.Min("Id")));
letterFrequencySumId = db.Scalar<int>(db.From<LetterFrequency>().Select(Sql.Sum("Id")));
}
public static int InitLetters(IDbConnection db)
{
db.DropAndCreateTable<LetterFrequency>();
var firstId = db.Insert(new LetterFrequency { Letter = "A" }, selectIdentity: true);
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "C" });
db.Insert(new LetterFrequency { Letter = "C" });
db.Insert(new LetterFrequency { Letter = "C" });
db.Insert(new LetterFrequency { Letter = "D" });
db.Insert(new LetterFrequency { Letter = "D" });
db.Insert(new LetterFrequency { Letter = "D" });
db.Insert(new LetterFrequency { Letter = "D" });
return (int)firstId;
}
[Test]
public void Can_select_Dictionary_with_SqlExpression()
{
using var db = OpenDbConnection();
var firstId = InitLetters(db);
var expected = new Dictionary<string, int> {
{ "A", 1 }, { "B", 2 }, { "C", 3 },
};
var query = db.From<LetterFrequency>()
.Select(x => new { x.Letter, count = Sql.Count("*") })
.Where(q => q.Letter != "D")
.GroupBy(x => x.Letter);
query.ToSelectStatement().Print();
var map = db.Dictionary<string, int>(query);
Assert.That(map.EquivalentTo(expected));
// Same, but group by an anonymous type using an alias - this should not translate to "GROUP BY TheLetter AS Letter", which is invalid SQL
query = db.From<LetterFrequency>()
.Select(x => new { x.Letter, count = Sql.Count("*") })
.Where(q => q.Letter != "D")
.GroupBy(x => new { TheLetter = x.Letter });
map = db.Dictionary<string, int>(query);
Assert.That(map.EquivalentTo(expected));
// Now group by all columns without listing them - effectively "SELECT DISTINCT *"
query = db.From<LetterFrequency>()
.Where(q => q.Letter != "D")
.GroupBy(x => new { x })
.Select(x => new { x.Id });
var list = db.SqlList<int>(query);
Assert.That(list, Is.EquivalentTo(new[] { 0, 1, 2, 3, 4, 5 }.AdjustIds(firstId)));
}
[Test]
public void Can_select_ColumnDistinct_with_SqlExpression()
{
using var db = OpenDbConnection();
InitLetters(db);
var query = db.From<LetterFrequency>()
.Where(q => q.Letter != "D")
.Select(x => x.Letter);
query.ToSelectStatement().Print();
var uniqueLetters = db.ColumnDistinct<string>(query);
Assert.That(uniqueLetters.EquivalentTo(new[] { "A", "B", "C" }));
}
[Test]
public void Can_Select_as_List_Object()
{
using var db = OpenDbConnection();
InitLetters(db);
GetIdStats(db);
var query = db.From<LetterFrequency>()
.Select("COUNT(*), MAX(Id), MIN(Id), Sum(Id)");
query.ToSelectStatement().Print();
var results = db.Select<List<object>>(query);
Assert.That(results.Count, Is.EqualTo(1));
var result = results[0];
CheckDbTypeInsensitiveEquivalency(result);
var single = db.Single<List<object>>(query);
CheckDbTypeInsensitiveEquivalency(single);
result.PrintDump();
}
[Test]
public void Can_Select_as_List_ValueTuple()
{
using var db = OpenDbConnection();
InitLetters(db);
GetIdStats(db);
//var a = new ValueTuple<int, int, int, int>();
//a.Item1 = 1;
var query = db.From<LetterFrequency>()
.Select("COUNT(*), MIN(Letter), MAX(Letter), Sum(Id)");
var results = db.Select<(int count, string min, string max, int sum)>(query);
Assert.That(results.Count, Is.EqualTo(1));
var result = results[0];
Assert.That(result.count, Is.EqualTo(10));
Assert.That(result.min, Is.EqualTo("A"));
Assert.That(result.max, Is.EqualTo("D"));
Assert.That(result.sum, Is.EqualTo(letterFrequencySumId));
var single = db.Single<(int count, string min, string max, int sum)>(query);
Assert.That(single.count, Is.EqualTo(10));
Assert.That(single.min, Is.EqualTo("A"));
Assert.That(single.max, Is.EqualTo("D"));
Assert.That(single.sum, Is.EqualTo(letterFrequencySumId));
single = db.Single<(int count, string min, string max, int sum)>(
db.From<LetterFrequency>()
.Select(x => new
{
Count = Sql.Count("*"),
Min = Sql.Min(x.Letter),
Max = Sql.Max(x.Letter),
Sum = Sql.Sum(x.Id)
}));
Assert.That(single.count, Is.EqualTo(10));
Assert.That(single.min, Is.EqualTo("A"));
Assert.That(single.max, Is.EqualTo("D"));
Assert.That(single.sum, Is.EqualTo(letterFrequencySumId));
}
[Test]
public async System.Threading.Tasks.Task Can_Select_as_List_ValueTuple_Async()
{
using var db = await OpenDbConnectionAsync();
InitLetters(db);
GetIdStats(db);
//var a = new ValueTuple<int, int, int, int>();
//a.Item1 = 1;
var query = db.From<LetterFrequency>()
.Select("COUNT(*), MIN(Letter), MAX(Letter), Sum(Id)");
var results = await db.SelectAsync<(int count, string min, string max, int sum)>(query);
Assert.That(results.Count, Is.EqualTo(1));
var result = results[0];
Assert.That(result.count, Is.EqualTo(10));
Assert.That(result.min, Is.EqualTo("A"));
Assert.That(result.max, Is.EqualTo("D"));
Assert.That(result.sum, Is.EqualTo(letterFrequencySumId));
var single = await db.SingleAsync<(int count, string min, string max, int sum)>(query);
Assert.That(single.count, Is.EqualTo(10));
Assert.That(single.min, Is.EqualTo("A"));
Assert.That(single.max, Is.EqualTo("D"));
Assert.That(single.sum, Is.EqualTo(letterFrequencySumId));
single = await db.SingleAsync<(int count, string min, string max, int sum)>(
db.From<LetterFrequency>()
.Select(x => new
{
Count = Sql.Count("*"),
Min = Sql.Min(x.Letter),
Max = Sql.Max(x.Letter),
Sum = Sql.Sum(x.Id)
}));
Assert.That(single.count, Is.EqualTo(10));
Assert.That(single.min, Is.EqualTo("A"));
Assert.That(single.max, Is.EqualTo("D"));
Assert.That(single.sum, Is.EqualTo(letterFrequencySumId));
}
private void CheckDbTypeInsensitiveEquivalency(List<object> result)
{
Assert.That(Convert.ToInt64(result[0]), Is.EqualTo(10));
Assert.That(Convert.ToInt64(result[1]), Is.EqualTo(letterFrequencyMaxId));
Assert.That(Convert.ToInt64(result[2]), Is.EqualTo(letterFrequencyMinId));
Assert.That(Convert.ToInt64(result[3]), Is.EqualTo(letterFrequencySumId));
}
[Test]
public void Can_Select_as_Dictionary_Object()
{
using var db = OpenDbConnection();
InitLetters(db);
GetIdStats(db);
var query = db.From<LetterFrequency>()
.Select("COUNT(*) \"Count\", MAX(Id) \"Max\", MIN(Id) \"Min\", Sum(Id) \"Sum\"");
query.ToSelectStatement().Print();
var results = db.Select<Dictionary<string, object>>(query);
Assert.That(results.Count, Is.EqualTo(1));
var result = results[0];
CheckDbTypeInsensitiveEquivalency(result);
var single = db.Single<Dictionary<string, object>>(query);
CheckDbTypeInsensitiveEquivalency(single);
results.PrintDump();
}
private void CheckDbTypeInsensitiveEquivalency(Dictionary<string, object> result)
{
Assert.That(Convert.ToInt64(result["Count"]), Is.EqualTo(10));
Assert.That(Convert.ToInt64(result["Max"]), Is.EqualTo(letterFrequencyMaxId));
Assert.That(Convert.ToInt64(result["Min"]), Is.EqualTo(letterFrequencyMinId));
Assert.That(Convert.ToInt64(result["Sum"]), Is.EqualTo(letterFrequencySumId));
}
[Test]
public void Can_select_Object()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
var id = db.Insert(new LetterFrequency { Id = 1, Letter = "A" }, selectIdentity: true);
var result = db.Scalar<object>(db.From<LetterFrequency>().Select(x => x.Letter));
Assert.That(result, Is.EqualTo("A"));
result = db.Scalar<object>(db.From<LetterFrequency>().Select(x => x.Id));
Assert.That(Convert.ToInt64(result), Is.EqualTo(id));
}
[Test]
public void Can_select_limit_with_SqlExpression()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.DropAndCreateTable<LetterWeighting>();
var letters = "A,B,C,D,E".Split(',');
var i = 0;
letters.Each(letter =>
{
var id = db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true);
db.Insert(new LetterWeighting { LetterFrequencyId = id, Weighting = ++i * 10 });
});
var results = db.Select(db.From<LetterFrequency>().Limit(3));
Assert.That(results.Count, Is.EqualTo(3));
results = db.Select(db.From<LetterFrequency>().Skip(3));
Assert.That(results.Count, Is.EqualTo(2));
results = db.Select(db.From<LetterFrequency>().Limit(1, 2));
Assert.That(results.Count, Is.EqualTo(2));
Assert.That(results.ConvertAll(x => x.Letter), Is.EquivalentTo(new[] { "B", "C" }));
results = db.Select(db.From<LetterFrequency>().Skip(1).Take(2));
Assert.That(results.ConvertAll(x => x.Letter), Is.EquivalentTo(new[] { "B", "C" }));
results = db.Select(db.From<LetterFrequency>()
.OrderByDescending(x => x.Letter)
.Skip(1).Take(2));
Assert.That(results.ConvertAll(x => x.Letter), Is.EquivalentTo(new[] { "D", "C" }));
}
[Test]
public void Can_select_limit_with_JoinSqlBuilder()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.DropAndCreateTable<LetterWeighting>();
var letters = "A,B,C,D,E".Split(',');
var i = 0;
letters.Each(letter =>
{
var id = db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true);
db.Insert(new LetterWeighting { LetterFrequencyId = id, Weighting = ++i * 10 });
});
#pragma warning disable 618
var joinFn = new Func<JoinSqlBuilder<LetterFrequency, LetterWeighting>>(() =>
new JoinSqlBuilder<LetterFrequency, LetterWeighting>(DialectProvider)
.Join<LetterFrequency, LetterWeighting>(x => x.Id, x => x.LetterFrequencyId)
);
#pragma warning restore 618
var results = db.Select<LetterFrequency>(joinFn());
Assert.That(results.Count, Is.EqualTo(5));
results = db.Select<LetterFrequency>(joinFn().Limit(3));
Assert.That(results.Count, Is.EqualTo(3));
results = db.Select<LetterFrequency>(joinFn().Skip(3));
Assert.That(results.Count, Is.EqualTo(2));
results = db.Select<LetterFrequency>(joinFn().Limit(1, 2));
Assert.That(results.Count, Is.EqualTo(2));
Assert.That(results.ConvertAll(x => x.Letter), Is.EquivalentTo(new[] { "B", "C" }));
results = db.Select<LetterFrequency>(joinFn().Skip(1).Take(2));
Assert.That(results.ConvertAll(x => x.Letter), Is.EquivalentTo(new[] { "B", "C" }));
results = db.Select<LetterFrequency>(joinFn()
.OrderByDescending<LetterFrequency>(x => x.Letter)
.Skip(1).Take(2));
Assert.That(results.ConvertAll(x => x.Letter), Is.EquivalentTo(new[] { "D", "C" }));
}
[Test]
public void Can_add_basic_joins_with_SqlExpression()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.DropAndCreateTable<LetterStat>();
var letters = "A,B,C,D,E".Split(',');
var i = 0;
letters.Each(letter =>
{
var id = db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true);
db.Insert(new LetterStat
{
LetterFrequencyId = id,
Letter = letter,
Weighting = ++i * 10
});
});
db.Insert(new LetterFrequency { Letter = "F" });
Assert.That(db.Count<LetterFrequency>(), Is.EqualTo(6));
var results = db.Select(db.From<LetterFrequency, LetterStat>());
db.GetLastSql().Print();
Assert.That(results.Count, Is.EqualTo(5));
results = db.Select(db.From<LetterFrequency, LetterStat>((x, y) => x.Id == y.LetterFrequencyId));
db.GetLastSql().Print();
Assert.That(results.Count, Is.EqualTo(5));
results = db.Select(db.From<LetterFrequency>()
.Join<LetterFrequency, LetterStat>((x, y) => x.Id == y.LetterFrequencyId));
db.GetLastSql().Print();
Assert.That(results.Count, Is.EqualTo(5));
}
[Test]
public void Can_do_ToCountStatement_with_SqlExpression_if_where_expression_refers_to_joined_table()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.DropAndCreateTable<LetterStat>();
var letterFrequency = new LetterFrequency { Letter = "A" };
letterFrequency.Id = (int)db.Insert(letterFrequency, true);
db.Insert(new LetterStat { Letter = "A", LetterFrequencyId = letterFrequency.Id, Weighting = 1 });
var expr = db.From<LetterFrequency>()
.Join<LetterFrequency, LetterStat>()
.Where<LetterStat>(x => x.Id > 0);
var count = db.SqlScalar<long>(expr.ToCountStatement(), expr.Params.ToDictionary(param => param.ParameterName, param => param.Value));
Assert.That(count, Is.GreaterThan(0));
count = db.Count(db.From<LetterFrequency>().Join<LetterStat>().Where<LetterStat>(x => x.Id > 0));
Assert.That(count, Is.GreaterThan(0));
Assert.That(
db.Exists(db.From<LetterFrequency>().Join<LetterStat>().Where<LetterStat>(x => x.Id > 0)));
}
[Test]
public void Can_do_ToCountStatement_with_SqlExpression_if_expression_has_groupby()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
var query = db.From<LetterFrequency>()
.Select(x => x.Letter)
.GroupBy(x => x.Letter);
var count = db.Count(query);
db.GetLastSql().Print();
Assert.That(count, Is.EqualTo(7)); //Sum of Counts returned [3,4]
var rowCount = db.RowCount(query);
db.GetLastSql().Print();
Assert.That(rowCount, Is.EqualTo(2));
rowCount = db.Select(query).Count;
db.GetLastSql().Print();
Assert.That(rowCount, Is.EqualTo(2));
}
[Test]
public void Can_select_RowCount_with_db_params()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
var query = db.From<LetterFrequency>()
.Where(x => x.Letter == "B")
.Select(x => x.Letter);
var rowCount = db.RowCount(query);
db.GetLastSql().Print();
Assert.That(rowCount, Is.EqualTo(4));
var table = nameof(LetterFrequency).SqlTable(DialectProvider);
rowCount = db.RowCount("SELECT * FROM {0} WHERE Letter = @p1".PreNormalizeSql(db).Fmt(table), new { p1 = "B" });
Assert.That(rowCount, Is.EqualTo(4));
rowCount = db.RowCount("SELECT * FROM {0} WHERE Letter = @p1".PreNormalizeSql(db).Fmt(table),
new[] { db.CreateParam("p1", "B") });
Assert.That(rowCount, Is.EqualTo(4));
}
[Test]
public void Can_get_RowCount_if_expression_has_OrderBy()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.Insert(new LetterFrequency { Letter = "A" });
db.Insert(new LetterFrequency { Letter = "B" });
db.Insert(new LetterFrequency { Letter = "B" });
var query = db.From<LetterFrequency>()
.Select(x => x.Letter)
.OrderBy(x => x.Id);
var rowCount = db.RowCount(query);
Assert.That(rowCount, Is.EqualTo(3));
rowCount = db.Select(query).Count;
Assert.That(rowCount, Is.EqualTo(3));
}
[Test]
public void Can_OrderBy_Fields_with_different_sort_directions()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.DropAndCreateTable<LetterStat>();
var insertedIds = new List<long>();
"A,B,B,C,C,C,D,D,E".Split(',').Each(letter =>
{
insertedIds.Add(db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true));
});
var rows = db.Select(db.From<LetterFrequency>().OrderByFields("Letter", "Id"));
Assert.That(rows.Map(x => x.Letter), Is.EquivalentTo("A,B,B,C,C,C,D,D,E".Split(',')));
Assert.That(rows.Map(x => x.Id), Is.EquivalentTo(insertedIds));
rows = db.Select(db.From<LetterFrequency>().OrderByFields("Letter", "-Id"));
Assert.That(rows.Map(x => x.Letter), Is.EquivalentTo("A,B,B,C,C,C,D,D,E".Split(',')));
Assert.That(rows.Map(x => x.Id), Is.EquivalentTo(insertedIds));
rows = db.Select(db.From<LetterFrequency>().OrderByFieldsDescending("Letter", "-Id"));
Assert.That(rows.Map(x => x.Letter), Is.EquivalentTo("E,D,D,C,C,C,B,B,A".Split(',')));
Assert.That(rows.Map(x => x.Id), Is.EquivalentTo(Enumerable.Reverse(insertedIds)));
}
[Test]
public void Can_Select_with_List_Contains()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
var insertedIds = "A,B,B,C,C,C,D,D,E".Split(',').Map(letter =>
db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true));
var first3Ids = insertedIds.Take(3).ToList();
var letters = db.Column<string>(db.From<LetterFrequency>()
.Where(x => first3Ids.Contains(x.Id))
.OrderBy(x => x.Id)
.Select(x => x.Letter));
Assert.That(letters.Join(","), Is.EqualTo("A,B,B"));
letters = db.Column<string>(db.From<LetterFrequency>()
.Where(x => !first3Ids.Contains(x.Id))
.OrderBy(x => x.Id)
.Select(x => x.Letter));
db.GetLastSql().Print();
Assert.That(letters.Join(","), Is.EqualTo("C,C,C,D,D,E"));
}
[Test]
public void Can_select_limit_on_Table_with_References()
{
//This version of MariaDB doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
if (Dialect == Dialect.AnyMySql) return;
//Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.
if ((Dialect & Dialect.AnySqlServer) == Dialect)
return;
using var db = OpenDbConnection();
CustomerOrdersUseCase.DropTables(db); //Has conflicting 'Order' table
db.DropAndCreateTable<Order>();
db.DropAndCreateTable<Customer>();
db.DropAndCreateTable<CustomerAddress>();
var customer1 = LoadReferencesTests.GetCustomerWithOrders("1");
db.Save(customer1, references: true);
var customer2 = LoadReferencesTests.GetCustomerWithOrders("2");
db.Save(customer2, references: true);
var results = db.LoadSelect(db.From<Customer>()
.OrderBy(x => x.Id)
.Limit(1, 1));
//db.GetLastSql().Print();
Assert.That(results.Count, Is.EqualTo(1));
Assert.That(results[0].Name, Is.EqualTo("Customer 2"));
Assert.That(results[0].PrimaryAddress.AddressLine1, Is.EqualTo("2 Humpty Street"));
Assert.That(results[0].Orders.Count, Is.EqualTo(2));
results = db.LoadSelect(db.From<Customer>()
.Join<CustomerAddress>()
.OrderBy(x => x.Id)
.Limit(1, 1));
db.GetLastSql().Print();
Assert.That(results.Count, Is.EqualTo(1));
Assert.That(results[0].Name, Is.EqualTo("Customer 2"));
Assert.That(results[0].PrimaryAddress.AddressLine1, Is.EqualTo("2 Humpty Street"));
Assert.That(results[0].Orders.Count, Is.EqualTo(2));
}
[Test]
public void Can_select_subselect()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
var insertedIds = "A,B,B,C,C,C,D,D,E".Split(',').Map(letter =>
db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true));
var q = db.From<LetterFrequency>(db.TableAlias("x"));
q.Where(x => x.Letter == Sql.TableAlias(x.Letter, "obj"));
var subSql = q.Select(Sql.Count("*")).ToSelectStatement();
var rows = db.Select<Dictionary<string, object>>(db.From<LetterFrequency>(db.TableAlias("obj"))
.Where(x => x.Letter == "C")
.Select(x => new {
x,
count = Sql.Custom($"({subSql})"),
}));
rows.PrintDump();
Assert.That(rows.Count, Is.EqualTo(3));
Assert.That(rows.All(x => x["count"].ConvertTo<int>() == 3));
}
[Test]
public void Can_use_SqlCustom_in_subselect_condition()
{
using var db = OpenDbConnection();
db.DropAndCreateTable<LetterFrequency>();
db.DropAndCreateTable<LetterWeighting>();
var letters = "A,B,C,D,E".Split(',');
var i = 0;
letters.Each(letter =>
{
var id = db.Insert(new LetterFrequency { Letter = letter }, selectIdentity: true);
db.Insert(new LetterWeighting { LetterFrequencyId = id, Weighting = ++i * 10 });
});
db.Insert(new LetterFrequency { Letter = "F" });
var q = db.From<LetterFrequency>(db.TableAlias("a"))
.WhereNotExists(db.From<LetterWeighting>()
.Where<LetterFrequency,LetterWeighting>((a,b) => b.LetterFrequencyId == Sql.TableAlias(a.Id, "a"))
.Select(Sql.Custom("null")));
var results = db.Select(q);
Assert.That(results.Count, Is.EqualTo(1));
Assert.That(results[0].Letter, Is.EqualTo("F"));
}
}