Search: "sql"

Write a SQL Query from a Plain-English Question

You are a SQL expert and data analyst. I will describe a question in plain Engli...

#data #sql #query

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#data-quality #dashboard #sanity-check

Sanity Check a Dashboard Number That Looks Too Good to Be True

A number on my dashboard looks too good to be true. Metric: [METRIC NAME]. Repor...

#data #sql #query-optimization

Data: Rewrite a Slow Query Without Changing What It Returns

I have a SQL query that's slow. Make it fast while keeping the result set identi...

Data: Write a SQL Query for a Cohort Retention Table

I want a SQL query that returns a cohort retention table — rows = signup month, ...

#data #sql #retention

Data: Write a Backfill Query That Won't Take Down the Database

I need to backfill [COLUMN/TABLE] with [LOGIC]. The table has [N] rows. Write th...

#data #sql #backfill

Write a SQL query to find customers who used to engage but have quietly dropped off

I want to find 'silently churning' customers — users who used to be active and h...

#data #sql #churn

Write a query that survives the source table being renamed in six months

I need to write a SQL query that pulls weekly metrics for a dashboard. The sourc...

#sql #data #query

#migration #sql #zero-downtime

Write a Defensive Migration Script for a NOT NULL Column Addition

Act as a database migration specialist. I need to add a NOT NULL column [column_...

#sql #analytics #business-questions

Translate a Business Question into a Defensible SQL Query

You are an analytics engineer. I will paste a fuzzy business question (e.g., 'ho...

Build a Funnel Analysis That Answers Which Step to Fix First

Help me run a funnel analysis on [PRODUCT FLOW — e.g., signup → activate → retai...

#data #funnel #analytics

#coding #sql #performance

Coding: Write the SQL Index I Actually Need (Not the One I Think I Need)

I have a slow query and I'm about to add an index. Before I do, help me think it...

Build a SQL Style Guide That Survives a Growing Team

Act as a data platform tech lead. Write me a SQL style guide tailored to a 10-pe...

#sql #style-guide #dbt

Write a SQL query that returns the right answer when the data has duplicates

I'm writing a SQL query against tables [paste schemas, especially the join keys]...

#sql #joins #duplicates

Choose the right join before I merge two datasets

I have two tables I want to combine and I'll describe the key columns and what e...

#data #joins #sql

Write and Explain a SQL Query

You are an expert SQL expert. Help me write a correct SQL query and understand e...

#data #sql #query

Optimize a SQL Query for Speed

You are a database performance engineer. I will paste a slow SQL query and the t...

#coding #sql #database

#SQL #window functions #query optimization

Rewrite a slow correlated subquery as a window function

I have a query with a correlated subquery that runs once per row to find each cu...

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data intermediate

Write SQL Queries from a Question

Act as a SQL expert. My tables are: [describe tables and key columns]. Write a S...

#data #sql #queries

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#coding #database #performance

Optimize a Slow Database Query

Act as a database performance engineer. Here is a slow query and its context: [P...

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