Running Total Examples in SQL

What Running Total does

Calculate cumulative totals over time. SQL syntax can vary by database, but the pattern below is a useful starting point for reports and analysis.

Syntax or pattern

SUM(amount) OVER (ORDER BY order_date ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)

✍️

5 practical examples

Running sales by date

Create cumulative sales over time.

SELECT order_date, amount,
  SUM(amount) OVER (ORDER BY order_date ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS running_sales
FROM daily_sales;

A running total accumulates each row with all prior rows.

Running total by customer

Restart cumulative amount for each customer.

SELECT customer_id, order_date, total_amount,
  SUM(total_amount) OVER (PARTITION BY customer_id ORDER BY order_date) AS customer_running_total
FROM orders;

PARTITION BY restarts the running total per customer.

Running count of orders

Count orders over time.

SELECT order_date,
  COUNT(*) OVER (ORDER BY order_date) AS running_order_count
FROM orders;

This shows growth in order volume.

Running inventory movement

Track stock movement across dates.

SELECT movement_date, quantity_change,
  SUM(quantity_change) OVER (PARTITION BY product_id ORDER BY movement_date) AS stock_balance
FROM inventory_movements;

Useful for inventory history reports.

Running total after monthly grouping

Summarize monthly sales, then accumulate.

WITH monthly AS (
  SELECT DATE_TRUNC('month', order_date) AS month, SUM(total_amount) AS sales
  FROM orders
  GROUP BY 1
)
SELECT month, sales, SUM(sales) OVER (ORDER BY month) AS running_sales
FROM monthly;

Group first when the running total should be by month rather than by row.

Common mistakes to avoid

Forgetting that SQL dialects vary across PostgreSQL, SQL Server, MySQL, BigQuery and SQLite.
Using SELECT * in production reports when only a few columns are needed.
Not checking join keys, duplicate rows or NULL values before trusting results.

FAQ

Will this SQL work in every database?

The idea is portable, but function names and date syntax may vary. Check your database dialect if a function is not recognized.

Should I use this in a report query?

Yes, if the pattern matches the business question and you have checked filters, joins and row counts.

Why does my result have too many rows?

The most common reasons are duplicate join keys, missing filters or grouping at the wrong level of detail.

💡 Useful resources

Here are some ideas for you

Optional resources that may help if you are learning SQL, building reports, writing queries or improving your data workflow.

📘
SQL books for beginners
Practice query patterns with structured examples and exercises.
See ideas
🧱
Database design books
Understand tables, keys, relationships and why joins behave the way they do.
See ideas
⌨️
Mechanical keyboards
Useful if you write queries, code and documentation for long work sessions.
See ideas
🖥️
External monitors
View query editor, result grid and documentation side by side.
See ideas
📒
Developer notebooks
Sketch table relationships, query logic and report ideas before coding.
See ideas
💡
Desk lamps
Keep your workspace comfortable while studying or debugging queries.
See ideas

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