SQL Tips for DB2 LUW

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Who's the most popular kid on the block?

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Background Roberto from Italy sent me the following question: Is there something like the STATS_MODE() function in DB2? He says STATS_MODE() is supposed to return the most frequently occurring value from a multi-set of values. A bit of rifling through the internet, steering clear of zones forbidden to me, reveals that STATS_MODE is an aggregate function similar to SUM() or AVG(). The function returns the most frequent value within a group. If there are two equally frequent values one of them will be picked with no specific rule. DB2 does not... [More]

Tags: by frequent group olap values stats_mode

The trouble of combining DISTINCT with ORDER BY

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Motivation Yesterday one of my coworkers from India asked for my help in migrating the following SQL statement from Sybase to DB2. SELECT DISTINCT c1, c2 FROM t ORDER BY c3 When this statement is run in DB2 (assuming the appropriate definition of "T") the following error is being returned: SQL0214N An expression in the ORDER BY clause in the following position, or starting with "C3" in the "ORDER BY" clause is not valid. Reason code = "2". Why does DB2 raise this error? The reason is simple: It's not... [More]

Tags: olap by distinct order row_number sybase over

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Who's the most popular kid on the block?

The trouble of combining DISTINCT with ORDER BY