dbaltop

Returns the type of aggregate function for a compute column.

Syntax

INT dbaltop (
PDBPROCESS dbproc,
INT computeid,
INT column );

where

dbproc

The DBPROCESS structure that is the handle for a particular workstation/ SQL Server 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:

Call dbaltop only after dbnextrow or dbgetrow returns a computeid.

If computeid or column is not valid, -1 is returned.

Example

After the following SELECT, calling dbaltop(dbproc, 1, 1) returns the type for COUNT since 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.

See Also

dbadata, dbadlen, dbaltlen, dbgetrow, dbnextrow, dbnumalts, dbprtype