How to Run SQL Queries Based on Oracle DB Version скачать в хорошем качестве

How to Run SQL Queries Based on Oracle DB Version

Discover how to execute SQL queries conditionally based on Oracle Database versions. Learn to tailor your SQL for specific versions like `12c` and `19c`, while excluding `11g`. --- This video is based on the question https://stackoverflow.com/q/76821268/ asked by the user 'Roshni Rabi' ( https://stackoverflow.com/u/20087400/ ) and on the answer https://stackoverflow.com/a/76856379/ provided by the user 'Jon Heller' ( https://stackoverflow.com/u/409172/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: query that runs on particular Oracle DB versions only Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Run SQL Queries Based on Oracle DB Version: A Complete Guide When working with different versions of Oracle Database, it can often be challenging to ensure that your SQL queries will run correctly and yield the desired results. This is particularly important if you have queries that are only applicable to newer versions such as 12c and 19c, while needing to avoid execution on older versions like 11g. In this guide, we’ll explore how to create a SQL query that adapts based on the Oracle Database version. Understanding the Problem You have a specific SQL query that combines results for credentials from dba_credentials and cdb_credentials views. This query needs to run selectively based on the database version: Run only on versions 12c and 19c. Avoid execution on 11g. Here is the original query that you wanted to run: [[See Video to Reveal this Text or Code Snippet]] If the SQL runs on 11g, it should simply not execute. The Solution To solve this problem, we can utilize the Oracle DBMS_XMLGEN package for constructing a dynamic SQL query. The proposed solution not only checks whether specific views exist but also adapts the SQL execution based on the Oracle Database version detected. Step-by-Step Breakdown of the Query Check for View Existence: The first step in the query is to check if the CDB_CREDENTIALS view exists. This confirms whether the environment is compatible for running the required query. Conditional SQL Generation: Based on the existence check, a conditional SQL statement is constructed. If the CDB_CREDENTIALS view exists, the key query is generated. Otherwise, a placeholder query that returns no results is created. Executing the Dynamic Query: The generated SQL is then executed by transforming it into XML using DBMS_XMLGEN. Finally, the results are extracted from the XML. Here’s the complete SQL query that accomplishes this: [[See Video to Reveal this Text or Code Snippet]] Conclusion This solution effectively allows for conditional execution of SQL queries based on the Oracle Database version, ensuring your application remains robust and adaptable. By leveraging dynamic SQL and XML processing, we can cater to varying environments without compromising performance or accuracy. If you're working with Oracle databases and need to configure different queries based on version compatibility, this approach could save you from many headaches in the future. Happy querying!