private string PrepareSqlWithInputKeys()
{
const string sqlPattern = @"
{0}
SELECT e.{1}, e.TflKey{2}
FROM {3} e WITH (NOLOCK)
INNER JOIN @KEYS k ON ({4});
";
var builder = new StringBuilder();
builder.AppendLine(_connection.WriteTemporaryTable("@KEYS", _key.WithInput()));
builder.AppendLine(SqlTemplates.BatchInsertValues(50, "@KEYS", _key.WithInput(), _entity.InputKeys, _connection));
var selectKeys = new FieldSqlWriter(_entity.PrimaryKey).AddDeleted(_entity).Alias(_connection.L, _connection.R).Write(", e.", false);
var joinKeys = new FieldSqlWriter(_entity.PrimaryKey).Input().Alias(_connection.L, _connection.R).Set("e", "k").Write(" AND ");
return(string.Format(sqlPattern, builder, selectKeys, PrepareVersion(), _connection.Enclose(_entity.OutputName()), joinKeys));
}