public SqlQuery QueryVersions(DatasetInfo baseTable, DatasetInfo versionedTable, Expression expression)
{
var sql = new SqlBuilder(adapter);
var v = new SchemaObject(versionedTable.Name, "v");
var a = new SchemaObject(baseTable.Name, "a");
sql.Append("SELECT ");
sql.WriteColumns(versionedTable.Members, prefix: "v"); // mutable values, primary keys, ...
sql.Append(", ");
sql.WriteColumns(baseTable.Members.Where(m => !m.IsVersion && !m.IsKey && !m.IsMutable), prefix: "a"); // immutable values from base table
sql.From(v); // SELECT from v
var keyName = baseTable.PrimaryKey[0].Name;
// join the base (immutable) values with the versioned values
sql.InnerJoin(
baseTable : v, // versioned values
joinedTable : a, // base values
baseColumn : keyName,
joinedColumn : keyName
);
sql.Where(Expand(expression, baseTable));
return new SqlQuery(sql.ToString(), sql.Parameters);
}
