Add multiple Having overloads

Author: mythz

src/ServiceStack.OrmLite/Expressions/SqlExpression.cs

@@ -861,7 +861,7 @@ public virtual SqlExpression<T> UnsafeHaving(string sqlFilter, params object[] f
             return this;
         }
 
-        public virtual SqlExpression<T> Having(Expression<Func<T, bool>> predicate)
+        protected SqlExpression<T> AppendHaving(Expression predicate)
         {
             if (predicate != null)
             {
@@ -877,6 +877,11 @@ public virtual SqlExpression<T> Having(Expression<Func<T, bool>> predicate)
             return this;
         }
 
+        public virtual SqlExpression<T> Having(Expression<Func<T, bool>> predicate) => AppendHaving(predicate);
+        public virtual SqlExpression<T> Having<Table>(Expression<Func<Table, bool>> predicate) => AppendHaving(predicate);
+        public virtual SqlExpression<T> Having<Table1, Table2>(Expression<Func<Table1, Table2, bool>> predicate) => AppendHaving(predicate);
+        public virtual SqlExpression<T> Having<Table1, Table2, Table3>(Expression<Func<Table1, Table2, Table3, bool>> predicate) => AppendHaving(predicate);
+
         public virtual SqlExpression<T> OrderBy() => OrderBy(string.Empty);
 
         public virtual SqlExpression<T> OrderBy(string orderBy) => UnsafeOrderBy(orderBy.SqlVerifyFragment());