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Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Tips and Tutorials How to do a "Control Break" (Algorithm) Post 302741635 by fpmurphy on Sunday 9th of December 2012 04:17:02 PM
Old 12-09-2012
I have to say that I have never heard this particular issue called the Control Break Algorithm before but a quick Internet search showed that the term is becoming somewhat common among educators. In SQL, this would be handled by the GROUP BY statement, in XSLT it is called grouping and is typically handled by the Muenchian Method.
 

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DB2_NUM_ROWS(3) 							 1							   DB2_NUM_ROWS(3)

db2_num_rows - Returns the number of rows affected by an SQL statement

SYNOPSIS
int db2_num_rows (resource $stmt) DESCRIPTION
Returns the number of rows deleted, inserted, or updated by an SQL statement. To determine the number of rows that will be returned by a SELECT statement, issue SELECT COUNT(*) with the same predicates as your intended SELECT statement and retrieve the value. If your application logic checks the number of rows returned by a SELECT statement and branches if the number of rows is 0, consider modi- fying your application to attempt to return the first row with one of db2_fetch_assoc(3), db2_fetch_both(3), db2_fetch_array(3), or db2_fetch_row(3), and branch if the fetch function returns FALSE. Note If you issue a SELECT statement using a scrollable cursor, db2_num_rows(3) returns the number of rows returned by the SELECT state- ment. However, the overhead associated with scrollable cursors significantly degrades the performance of your application, so if this is the only reason you are considering using scrollable cursors, you should use a forward-only cursor and either call SELECT COUNT(*) or rely on the boolean return value of the fetch functions to achieve the equivalent functionality with much better perfor- mance. PARAMETERS
o $stmt - A valid stmt resource containing a result set. RETURN VALUES
Returns the number of rows affected by the last SQL statement issued by the specified statement handle. PHP Documentation Group DB2_NUM_ROWS(3)
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