Databases

Questions about SQL, PostgreSQL, MongoDB, Redis, and data storage.

DatabasesMySQL JDBC Connection Refused Error: Troubleshooting Guide

Troubleshoot MySQL JDBC connection refused errors when command-line MySQL works. Learn about bind-address, IPv6/IPv4 conflicts, firewall issues, and solutions.

1 answer• 2 views
DatabasesExtract JSON Nodes from OpenSearch with Mustache Templates

Learn how to extract specific inner JSON nodes from OpenSearch data using Mustache templates. Efficiently retrieve nested 'clientAccounts' data without returning entire documents.

1 answer• 5 views
DatabasesSpeed Up Power Query: Diagnose & Optimize Performance

Step‑by‑step guide to diagnosing Power Query slowness—from filtering and Folder.Files to memory tuning, using Power BI for large file sets, and best practices.

1 answer• 3 views
DatabasesFind SQL Duplicates by Email & Name: GROUP BY Guide

Learn to find and remove SQL duplicates by multiple fields like email and name using GROUP BY, HAVING, window functions. Examples for detecting, retrieving full rows, and safe deletion in MySQL, PostgreSQL, SQL Server.

1 answer• 7 views