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Top free courses.

Three checks worth knowing.

Excel

Check the total before the chart.

Tea 40Coffee 25Tea 60

All sales: 125. Tea only: 100.

Try the total check

SQL

A row count isn’t a sales total.

COUNT(*) → 2 rows
SUM(sales) → 100

Two Tea sales—40 and 60—share one group.

See the query

AI at work

A fast draft still needs a check.

Draft→Source→Review

Compare the answer with its source before acting on it.

Build a checked workflow

customer	amount
Maya	40
Omar	25
Maya	60

customer	amount	record
Maya	40	A
Maya	40	B
Omar	25	A
Omar	25	B
Maya	60	A
Maya	60	B

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Top free courses.

Recommended

Three checks worth knowing.

Check the total before the chart.

A row count isn’t a sales total.

A fast draft still needs a check.

Which AI idea is worth trying?

Three ideas. Three different decisions.

Faster drafting ≠ the full saving.

A good demo is not a business case.

Start with the job, not the model

Count the review work

Give someone the authority to stop it

Take the pilot brief with you

When something doesn’t add up

Courses on this topic

Check the number before the chart.

What should Tea add up to?

A tidy chart can still show the wrong total.

Keep one row per sale

Check one category independently

Compare like with like

Try it in your spreadsheet

When something doesn’t add up

Courses on this topic

Why did your SQL total double?

Three orders. Two customer totals.

Correct syntax does not guarantee the right answer.

Write down what one row means

Predict the result before running it

Fix the join, not the total

Run the sample yourself

When something doesn’t add up

Courses on this topic

Let’s find the right page.

Fictional sales · A1:B4
Product	Sales
Tea	40
Coffee	25
Tea	Last Tea sale, from zero to 10000