DB2 SQL grouped data generates comma separated values
Question: Is there a function in DB2 SQL that can directly generate comma separated values of grouped column data?
Scenario: We have a table with ID column and Role column. There may be multiple rows for the same ID, with each row representing a different role for that ID. The goal is to concatenate these roles into a comma separated string for each unique ID.
Example:
<code>ID | Role ------------ 4555 | 2 4555 | 3 4555 | 4</code>
Expected output:
<code>4555 2,3,4</code>
Answer:
DB2 LUW 9.7 introduces a new function LITAGG that solves this problem.
Grammar:
<code>LISTAGG(expression, delimiter) WITHIN GROUP (ORDER BY expression ASC|DESC)</code>
Instructions:
- expression: Column to join
- delimiter: The delimiter used between concatenated values (e.g.,,)
Usage:
To retrieve the comma separated role values for each unique ID, you can use the following query:
<code>SELECT id, LISTAGG(role, ', ') WITHIN GROUP (ORDER BY role ASC) AS roles FROM myTable GROUP BY id;</code>
Output:
<code>ID | roles ------------ 4555 | 2,3,4</code>
Additional notes:
- The ORDER BY clause in the LISTAGG function determines the order of joins.
- If no ORDER BY clause is specified, the values will be concatenated in any order. The
- LISTAGG function can also be used to generate other types of connection strings, such as newline-separated values.
The above is the detailed content of How to Generate Comma-Separated Values from Grouped Data in DB2 SQL?. For more information, please follow other related articles on the PHP Chinese website!

This article explores optimizing MySQL memory usage in Docker. It discusses monitoring techniques (Docker stats, Performance Schema, external tools) and configuration strategies. These include Docker memory limits, swapping, and cgroups, alongside

This article addresses MySQL's "unable to open shared library" error. The issue stems from MySQL's inability to locate necessary shared libraries (.so/.dll files). Solutions involve verifying library installation via the system's package m

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

This article compares installing MySQL on Linux directly versus using Podman containers, with/without phpMyAdmin. It details installation steps for each method, emphasizing Podman's advantages in isolation, portability, and reproducibility, but also

This article provides a comprehensive overview of SQLite, a self-contained, serverless relational database. It details SQLite's advantages (simplicity, portability, ease of use) and disadvantages (concurrency limitations, scalability challenges). C

This guide demonstrates installing and managing multiple MySQL versions on macOS using Homebrew. It emphasizes using Homebrew to isolate installations, preventing conflicts. The article details installation, starting/stopping services, and best pra

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

SublimeText3 Mac version
God-level code editing software (SublimeText3)

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver CS6
Visual web development tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
