Скачать или смотреть How to Select Data and Insert into Another Table with Multiple Conditions in Oracle

Learn how to effectively select and insert data in Oracle by applying multiple conditions using SQL queries. A step-by-step guide on insertion techniques and best practices.
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How to Select Data and Insert into Another Table with Multiple Conditions in Oracle

In this guide, we will tackle a common scenario encountered by database administrators and developers: selecting data with numerous conditions and inserting it into another table. Specifically, we will focus on executing this task in Oracle SQL and explain the step-by-step process in a clear and concise manner.

The Problem

You may find yourself needing to pull data from a table based on several criteria and subsequently insert that data into a different table. For example, you might have a selection statement similar to the following SQL query:

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

This query pulls specific fields from the ne.mv_span table. However, we want to take the results of this query and insert them into a new table called TBL_FIP_FETCH_NELENGTH. This table has the following structure:

ID: NUMBER(18,8)

NE_LENGTH: NUMBER

SPAN_LINK_ID: NVARCHAR2(100)

As a note, both rj_span_id and rj_intracity_link_id will be combined and inserted into the SPAN_LINK_ID column.

The Solution

To achieve our goal of inserting the selected data into TBL_FIP_FETCH_NELENGTH, we have several options depending on how you prefer to structure the SQL query. Below are two effective methods for inserting the data.

Option 1: Using COALESCE

If only one of rj_span_id or rj_intracity_link_id can be not null, the COALESCE function could be the solution you need:

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

Option 2: Union of Two Queries

Alternatively, we can use a UNION operation to create two separate similar queries. One will insert rj_span_id, and the other will insert rj_intracity_link_id.

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

Final Notes

There is a last consideration: it's unclear from the query where the ID column in the target table is expected to be populated. If this ID is an auto-incrementing number, you may need to adjust the table's schema accordingly.

By following the above methods, you can effectively select data based on specific conditions and insert it into another table in Oracle SQL.

Conclusion

Inserting selected data into another table with multiple conditions in Oracle can be done efficiently using either the COALESCE function or a UNION of two queries. Understanding these concepts is fundamental for SQL users, as they allow for flexible and powerful data manipulation.

Feel free to reach out with any further questions or concerns about SQL operations in Oracle!