Below are list of eBooks useful for your quick reference.
32 Complex SQL Queries.

32 Complex SQL Queries
Useful for your interviews and Projects.
$1.00
DB2 Tough Interview Questions.

DB2 Tough Interview Questions
Useful for Interviews.
$1.00
DFSORT Best Examples.

DFSORT Best Examples
Useful for your projects and interviews.
$1.00
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