public QueryExpression() {
fromClause = QueryExpressionFromClause.Null;
middleClauses = new List<QueryExpressionClause>();
selectOrGroupClause = QueryExpressionClause.Null;
}
public QueryExpression()
{
fromClause = QueryExpressionFromClause.Null;
fromLetWhereClauses = new List<QueryExpressionClause>();
orderings = new List<QueryExpressionOrdering>();
selectOrGroupClause = QueryExpressionClause.Null;
intoClause = QueryExpressionIntoClause.Null;
}