6.9.1 Decision rules for derived column names in query specifications

In query specifications, derived column names are determined according to the following rules.

In the case of a FROM clause

The derived column names will be the column names of the table specified in the table reference.

Example
```
SELECT "C1","C2" FROM "T1"
```
In the example above, the derived column names are the names of the columns of table T1.
In the case of a GROUP BY clause

The derived column names will be the names of the grouping columns.

Example
```
SELECT "C1","GC2",SUM("C3") FROM "T1"
    GROUP BY "C1",SUBSTR("C2",5,2) AS "GC2"
```
In the example above, the derived column names are "C1" and "GC2".