March 2012
Intermediate to advanced
442 pages
9h 31m
English
Content preview from IBM DB2 9.7 Advanced Application Developer CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using the ALTER COLUMN SET DATA TYPE extended support
ALTER COLUMN SET DATA TYPE was present in the earlier versions of DB2 as well, supporting SMALLINT to INTEGER, INTEGER to BIG, REAL to DOUBLE, and BLOB(n) to BLOB(n+m) conversions; data types could not be cast to smaller data types. In DB2 9.7, the ALTER TABLE statement is extended to support all compatible types, from casting to small data types.
In some cases, data may be truncated upon altering the column data type such as DECIMAL to INTEGER. To avoid the data loss issues, DB2 9.7 scans the column data before the change and writes the error messages, such as overflow errors and truncation errors, into the notification log.
The column data type is set to a new data type only if there is no ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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