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The Basics of Relational Databases: Primary Keys and Foreign Keys Explained

What are Keys in Relational Databases? In a relational database, keys are crucial for ensuring data integrity and establishing relationships between tables. The two most important types of keys are: ...

15.03.2025 0 Read More

How to Fix Duplicate Key Value Violates Unique Constraint in PostgreSQL: A Developer's Survival Guide

Ah, the dreaded duplicate key value violates unique constraint error in PostgreSQL. It’s like that one friend who always shows up uninvited to your party, eats all the snacks, and then leaves witho...

16.03.2025 0 Read More

SQL Query Logical Order

SQL Query Logical Order: A Step-by-Step Breakdown Understanding the logical execution order of an SQL query is essential for writing optimized and efficient database queries. Unlike the typical SQL sy...

16.03.2025 0 Read More

sqlc: Type-Safe Querying in Go

Leapcell: The Next-Gen Serverless Platform for Golang Hosting Introduction The interfaces provided by the database/sql standard library in the Go language are relatively low-level. This requir...

16.03.2025 0 Read More

From Slow Queries to Fast Responses: The Power of Connection Pooling

Introduction So, what is connection pooling? If you’re a backend developer working with databases, you've likely heard this term. You might have also come across advice on the internet sugg...

16.03.2025 0 Read More

Calculate Monthly Account Balance and Fill in Missing Dates — From SQL to SPL #10

Problem description & analysis: There is a transaction table for the asset accounts in the MS SQL database, with dates that are not consecutive.Task: Now we need to calculate the balance ...

16.03.2025 0 Read More

Find the superset from the relationship table:SQL VS SPL#13

The MySQL database has two tables: bag table and bag item relationship table. Some bags are supersets of other bags.bag bag_item Now we need to find the superset for each bag: SQL： ⛶SELECT base....

17.03.2025 0 Read More

SQL Interview questions and answers

SQL Interview Questions & Answers: 1. What is SQL?--> SQL (Structured Query Language) is used to store, retrieve, manage, and manipulate data in relational databases like MySQL, Postgr...

17.03.2025 0 Read More

Supabase Alternatives 🔄 in 2025 😼

Supabase has gained significant popularity as an open-source Firebase alternative built on PostgreSQL, with accelerated adoption in the AI era as developers seek robust Backend-as-a-Service (BaaS) sol...

17.03.2025 0 Read More

The Basics of Relational Databases: Primary Keys and Foreign Keys Explained

How to Fix Duplicate Key Value Violates Unique Constraint in PostgreSQL: A Developer's Survival Guide

SQL Query Logical Order

sqlc: Type-Safe Querying in Go

Top 3 PostgreSQL Performance Issues: Diagnosis and Proven Solutions

From Slow Queries to Fast Responses: The Power of Connection Pooling

Calculate Monthly Account Balance and Fill in Missing Dates — From SQL to SPL #10

Find the superset from the relationship table:SQL VS SPL#13

SQL Interview questions and answers

Supabase Alternatives 🔄 in 2025 😼

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