Consolidating Multiple Rows into a Single Row in Oracle SQL
Oracle SQL offers several methods for combining multiple rows into a single row. One approach uses the WM_CONCAT
function (note: deprecated in Oracle 12c and later). WM_CONCAT
concatenates values from multiple rows within a specific column:
SELECT field1, WM_CONCAT(field2) FROM YourTable GROUP BY field1;
For Oracle versions where WM_CONCAT
is not available, a custom aggregate function provides a viable solution. Detailed guidance on creating such a function for string aggregation can be found on resources like Oracle-base.com. A basic example:
CREATE FUNCTION String_Agg(VALUES VARCHAR2, DELIM VARCHAR2) RETURN VARCHAR2; -- Function implementation details here
This custom function allows for string value aggregation:
SELECT field1, String_Agg(field2, ',') FROM YourTable GROUP BY field1;
Both WM_CONCAT
(where applicable) and custom aggregate functions effectively consolidate multiple rows into a single row, presenting data in a more concise and organized manner.
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