dbaltop
Returns the type of aggregate function for a compute column.
Syntax
INT dbaltop (
PDBPROCESS dbproc,
INT computeid,
INT column );
Arguments
dbproc
The DBPROCESS structure that is the handle for a particular workstation or Microsoft® SQL Server™ 2000 process. It contains all the information that DB-Library uses to manage communications and data between the workstation and SQL Server.
computeid
The ID that identifies the COMPUTE clause. A SELECT statement can have multiple COMPUTE clauses, which can have varying numbers of aggregate operators and aggregate targets. The computeid is returned by dbnextrow or dbgetrow.
column
The number of the column. The first column is number 1.
Returns
The type of aggregate operator for the particular column in the compute. The types are defined as follows:
| Type | Aggregate operator |
|---|---|
| SQLAOPSUM | SUM |
| SQLAOPAVG | AVG |
| SQLAOPCNT | COUNT |
| SQLAOPMIN | MIN |
| SQLAOPMAX | MAX |
Call dbaltop only after dbnextrow or dbgetrow returns a computeid.
If computeid or column is not valid, -1 is returned.
Examples
After the following SELECT statement, calling dbaltop(dbproc, 1, 1) returns the type for COUNT because the first aggregate operator in the first COMPUTE clause is COUNT:
SELECT dept, name FROM employee
ORDER BY dept, name
COMPUTE COUNT(name) BY dept
To convert the type to a readable string, use dbprtype.