LISTAGG in Oracle - Examples & AI Generator

Oracle's LISTAGG function allows you to concatenate values from multiple rows into a single, comma-separated string—a powerful tool, but one that comes with advanced syntax and ordering requirements. For SQL developers, analysts, and engineers, keeping track of different LISTAGG Oracle syntax can slow down productivity. AI2sql solves this instantly: describe your result and get a production-ready LISTAGG query in 10 seconds, no coding required.

LISTAGG Syntax in Oracle

Basic Structure

LISTAGG(column_name, 'delimiter') WITHIN GROUP (ORDER BY sort_column)

• column_name: The column whose values you want to concatenate.

• delimiter: The string to separate values (often a comma).

• WITHIN GROUP: Required for ordering in Oracle.

Unlike some databases, Oracle mandates WITHIN GROUP (ORDER BY ...) with LISTAGG.

LISTAGG Examples You Can Generate Instantly

• Concatenate customer cities per country

• List product names in each order

• Summarize employee names by department

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Why Use AI2sql Instead of Manual LISTAGG Coding

• No coding required—just describe your goal in plain language.

• Instant generation—avoid Oracle-specific syntax errors and complex ordering rules.

• Relevant across databases—AI2sql adapts LISTAGG-style queries for other SQL engines as well.

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Frequently Asked Questions about LISTAGG in Oracle

• How does LISTAGG handle long output strings in Oracle?
  Starting from Oracle 12.2, specify ON OVERFLOW TRUNCATE to manage overflows gracefully.

• Can I use DISTINCT with LISTAGG in Oracle?
  Oracle's native LISTAGG does not directly support DISTINCT, but you can use a subquery to deduplicate values before aggregation.

• What happens if I omit WITHIN GROUP in Oracle's LISTAGG?
  Oracle requires the WITHIN GROUP (ORDER BY ...) clause. Omitting it results in a syntax error.

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