Learn SQL

Working with SQL

Learn SQL basics and best practices

Best practices for writing SQL queries

SQL best practices: a brief guide to writing better SQL queries.

13 min read

Working with dates in SQL

Use SQL to group results by a time period, compare week-over-week totals, and find the duration between two dates.

9 min read

Simplify complex queries with Common Table Expressions (CTEs)

CTEs are named sets of results that help keep your code organized. They allow you to reuse results in the same query, and perform multi-level aggregations.

7 min read

Combining tables with joins

How to combine information from two tables with a join.

8 min read

SQL join types

Learn everything you need to know about using different SQL join types.

9 min read

How to calculate customer lifetime value (LTV) with SQL

Learn how to use SQL to calculate customer lifetime value in Metabase.

7 min read

Debugging SQL

Finding the root cause of common SQL query problems.

Debugging SQL syntax errors

What to do when your query returns an error message.

6 min read

Debugging SQL query logic

What to do when your query returns data that looks wrong.

4 min read

Debugging duplicated data in SQL query results

What to do when your query returns data with duplicated rows or columns.

3 min read

Debugging missing data in SQL query results

What to do when your query returns data that's missing rows or columns.

5 min read