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select * from SQL

Posts on tips and tricks, using and learning about SQL for database development and analysis.

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Your location join gives some job ads extra salary votes

Your location join gives some job ads extra salary votes

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7 min read
SQL SELECT Statement: Practical Examples for Interview Preparation

SQL SELECT Statement: Practical Examples for Interview Preparation

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4 min read
SQL basics

SQL basics

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2 min read
Two requests, one rule, two rows: fixing the INSERT ... WHERE NOT EXISTS race in PostgreSQL

Two requests, one rule, two rows: fixing the INSERT ... WHERE NOT EXISTS race in PostgreSQL

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6 min read
ROW VS PAGE VS COLUMNSTORE VS ARHIVE DATA COMPRESSION on SQLServer

ROW VS PAGE VS COLUMNSTORE VS ARHIVE DATA COMPRESSION on SQLServer

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3 min read
Two Duplicate Rows in 48 Hours: My Unique Index Treats NULL as a New Value

Two Duplicate Rows in 48 Hours: My Unique Index Treats NULL as a New Value

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5 min read
PostgreSQL 19 - Monitoring Lock Contention and Fast-Path Overflow with pg_stat_lock

PostgreSQL 19 - Monitoring Lock Contention and Fast-Path Overflow with pg_stat_lock

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7 min read
Curating a reporting schema for self-service users: views, friendly names and what to hide

Curating a reporting schema for self-service users: views, friendly names and what to hide

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7 min read
infinite recursion detected in policy for relation (42P17)

infinite recursion detected in policy for relation (42P17)

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4 min read
Your First Time-Range Query: A Practical Starting Point for Apache IoTDB

Your First Time-Range Query: A Practical Starting Point for Apache IoTDB

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4 min read
Write-Ahead Logging: How PostgreSQL & MySQL Survive Power Loss

Write-Ahead Logging: How PostgreSQL & MySQL Survive Power Loss

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1 min read
SQL NOT IN vs NOT EXISTS: Handling NULL Values Safely

SQL NOT IN vs NOT EXISTS: Handling NULL Values Safely

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3 min read
Deduplication does not refund your search result fees

Deduplication does not refund your search result fees

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6 min read
Your Query Used Parameters Everywhere Except the Sort Column

Your Query Used Parameters Everywhere Except the Sort Column

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2 min read
Why SQL NOT IN returns no rows when the column has NULL

Why SQL NOT IN returns no rows when the column has NULL

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4 min read
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