Скачать или смотреть Resolving ORA-00933: SQL command not properly ended in Oracle SQL Joins

Discover how to troubleshoot and fix the `ORA-00933` error in Oracle SQL by understanding the order of JOINs and WHERE clauses.
---
This video is based on the question https://stackoverflow.com/q/64581205/ asked by the user 'Data2explore' ( https://stackoverflow.com/u/5941908/ ) and on the answer https://stackoverflow.com/a/64581265/ provided by the user 'Littlefoot' ( https://stackoverflow.com/u/9097906/ ) 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: Oracle SQL DB select muti join error join error - ORA-00933: SQL command not properly ended

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.
---
Understanding the ORA-00933 Error in Oracle SQL

When working with Oracle SQL, encountering errors is a common hurdle, especially when joining multiple tables. One such error that SQL developers may face is ORA-00933: SQL command not properly ended. This specific error can be particularly frustrating, as it usually stems from a misunderstanding of SQL syntax or order of operations within the query. In this guide, we'll explore this error in detail, using a practical example, and most importantly, how to fix it.

The Problem

In your case, you are trying to join several tables from the DWH_SCHEMA database to fetch customer-related data. The SQL query you wrote, however, resulted in the ORA-00933 error. Typically, this error indicates that there's an issue with the SQL syntax, often related to the order of clauses or incorrect formatting of the JOIN statements.

The Tables Involved

TBL_ABC_CUSTOMER_D: Main customer table.

TBL_BBC_CUSTOMER_STATUS_D: Customer status table.

TBL_NBC_CUSTOMER_TYPE_D: Customer type table.

TBL_KBC_CUSTOMER_SEGMENT_TYPE_D: Customer segment type table.

TBL_NCC_CUSTOMER_SEGMENT_D: Another customer segment table.

Your query aimed to join these tables based on specific foreign keys that end with _UID. However, if the order of the joins and where conditions is not followed correctly, SQL will fail to parse the command properly.

Breaking Down the Solution

Understanding JOINs and WHERE Conditions

The key to resolving your issue lies in ensuring that JOIN clauses are arranged correctly relative to WHERE conditions. Here’s a simplified breakdown:

Joins Should Come First: All JOIN operations should be defined in the FROM clause before any filtering conditions applied in the WHERE clause.

Making Conditions Explicit: Conditions related to the specific JOINs should be incorporated in the JOIN statements for clear logical grouping.

Correcting Your SQL Query

Let’s transform your original query while ensuring proper syntax and order:

[[See Video to Reveal this Text or Code Snippet]]

Key Modifications:

Order of Clauses: All JOIN operations are performed before applying any WHERE conditions.

Clear Logical Structure: Each JOIN condition is explicitly defined right within the JOIN clause itself, reducing confusion.

Conclusion

If you're receiving the ORA-00933 error, remember: Joins should always come first, and conditions should follow. By understanding the structure of your SQL commands and following the clear organization of joins and conditions, you can eliminate syntax errors and write effective Oracle SQL queries.

For further queries or assistance, feel free to reach out in the comments below! Happy querying!