final MutableTable table = new MutableTable("tab", TableType.TABLE, schema);
final MutableColumn nameColumn = new MutableColumn("name", ColumnType.VARCHAR).setTable(table);
final MutableColumn ageColumn = new MutableColumn("age", ColumnType.INTEGER).setTable(table);
schema.addTable(table);
table.addColumn(nameColumn);
table.addColumn(ageColumn);
final Query q = new Query();
q.select(ageColumn).selectCount();
q.from(table);
q.where(ageColumn, OperatorType.GREATER_THAN, 18);