Corrections to OLAP chapter [CR 479852, 447363]

Chapter 4 “Using OLAP,” contains documentation errors, which are corrected in the next version of the Sybase IQ Performance and Tuning Guide:

Cube example 1 column headings have been corrected to match the example syntax: avg salary column head now reads AVERAGE.
Cube example 2 column headings have been corrected to match the example syntax: state now reads c_state, sex now reads c_gender, dept_id now reads c_dept, count now reads count(*), and avg salary now reads AVERAGE.
In “Windowing” under “Analytic functions,” the following syntax is repeated in two locations:
```
OLAP_FUNCTION() OVER (PARTITION BY col1, col2...)
```
The redundant paragraph and syntax will be removed in the next version.
In “An OLAP window’s three essential parts,” the first line of the syntax contains a repeated word, WINDOW, in the window definition list. The second instance will be removed in the next version.
In “Ascending and descending order for value-based frames” the syntax is incorrect and should be ordered by DESC instead of ASC. The corrected syntax should read as follows:
```
ORDER BY year DESC range BETWEEN CURRENT ROW and 1 FOLLOWING
```
In “Windowing aggregate functions,” “Windowing aggregate example 1” contains two errors. Column head Year should be Y, and the dates in the discussion output should match the syntax; 1993 should be 2000 and 1994 should be 2001.
In “Windowing aggregate functions,” “Windowing aggregate example 2” contains incorrect column headings. Employee should say E_name and Salary should say Sal.