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You're reading from  Developing Robust Date and Time Oriented Applications in Oracle Cloud

Product typeBook
Published inMay 2023
PublisherPackt
ISBN-139781804611869
Edition1st Edition
Tools
Oracle Database
Concepts
Databases
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Author (1)
Michal Kvet
Michal Kvet
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Michal Kvet

Michal Kvet is a researcher, educator, and database expert at the University of Žilina in Slovakia. His primary focus areas are databases, analytics, performance, and cloud computing. He works closely with Oracle and Oracle Academy. He is the co-author of multiple textbooks (a SQL and PL/SQL cookbook, a book on APEX application development, a book on temporal databases, and a MySQL cookbook), coordinates multiple Erasmus+ projects and co-organizes several research conferences and database workshops. Besides this, he supervises engineering projects and bachelor's, master's, and doctoral theses. Over the years, his research has been associated with date and time management and temporal databases. He has Oracle's SQL, PL/SQL, Cloud, Analytics, and Administration certifications. His core knowledge of temporality is provided to you in this book.
Read more about Michal Kvet

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Modeling a calendar using SQL

Although it is possible to hardcode a calendar using a PL/SQL block, it can look a bit complicated at first sight.

Now, let’s look at the monthly calendar definition using SQL. For simplicity, we will use the month extracted from the sysdate value, but generally, it can be applied to any specified DATE value. Note that the processing can be optimized by grouping multiple select statements together. However, for explanatory purposes, step-by-step processing is more convenient. Therefore, individual steps are nested. Each step takes the data from the preceding processing.

Step 1 – Getting the day numbers for each day in the month

The goal of this step is to get the same number of rows as the number of days in the month. To do that, the dual table is referenced, which holds just one row. Therefore, the CONNECT BY LEVEL clause is used with the value expressing the numerical representation of the difference between the last day of the...

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Developing Robust Date and Time Oriented Applications in Oracle Cloud
Published in: May 2023Publisher: PacktISBN-13: 9781804611869
© 2023 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Michal Kvet

Michal Kvet is a researcher, educator, and database expert at the University of Žilina in Slovakia. His primary focus areas are databases, analytics, performance, and cloud computing. He works closely with Oracle and Oracle Academy. He is the co-author of multiple textbooks (a SQL and PL/SQL cookbook, a book on APEX application development, a book on temporal databases, and a MySQL cookbook), coordinates multiple Erasmus+ projects and co-organizes several research conferences and database workshops. Besides this, he supervises engineering projects and bachelor's, master's, and doctoral theses. Over the years, his research has been associated with date and time management and temporal databases. He has Oracle's SQL, PL/SQL, Cloud, Analytics, and Administration certifications. His core knowledge of temporality is provided to you in this book.
Read more about Michal Kvet

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