In SQL added Overview of group, analytical, and hierarchical queries.
Some examples helps understand it quickly.
Try to solve it.
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Welcome to new version of Economist24.ru
Imroved style and perfomance.
Now site have topics about:
1) Training examples for Oracle exams 1z0-071, 1z0-149 and some materials about Oracle Database;
2) VBA connection info to Oracle Database and some materials about VBA and Excel;
3) Info about accounting entries and rules with examples (according to Federal Law about Accounting in Russian Federation №402).
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