public String ToSqlString(Junction junction)
{
if (0 == junction.Expressions.Count)
return "1=1";
StringBuilder sb = StringHelper.CreateBuilder().Append("(");
StringHelper.AppendItemsWithSeperator(junction.Expressions, ' ' + junction.Op + ' ',
delegate(IExpression exp)
{
sb.Append(exp.Render(this));
}, sb);
return sb.Append(')').ToString();
}