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In Projects, you can keep track of your progress as you go throught the tasks. Check each item as you complete it!

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Query Results

Run a query to see results.

Database Schema

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Aggregate Functions


The fastest way to calculate how many rows are in a table is to use the COUNT function.

COUNT is a function that takes the name of a column as an argument and counts the number of non-empty values in that column.

SELECT COUNT(*) FROM table_name;

Here, we want to count every row, so we pass * as an argument inside parenthesis.

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