Tag: IBM

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Null Troubles

(Craig Mullins) A null represents missing or unknown information at the column level. A null is not the same as 0 (zero) or blank. Null means no entry has been made for the column and it implies that the value is either unknown or not applicable.

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Star Schema and Pairwise Join

(Troy Coleman) DBAs who design and organize data warehouses should take the time to read the IBM Redbook, “Enterprise Data Warehousing with DB2 9 for z/OS.” In addition to offering a detailed explanation of data warehousing’s evolution on z/OS, it provides a great description of star schema database