How to calculate the median in SQL?

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🔹 Steps to calculate the median:

1. Order the data by the column you want the median for.

2. Find the middle value(s):

   • If the dataset has an odd number of rows → median is the middle value.

   • If the dataset has an even number of rows → median is the average of the two middle values.

🔹 General SQL Approach (using Window Functions like ROW_NUMBER, COUNT):

1. Use ROW_NUMBER() to assign a rank to each row when ordered.

2. Use COUNT(*) to find the total number of rows.

3. Pick the row(s) in the middle based on count.

   • If odd → pick the middle row.

   • If even → average the two middle rows.

🔹 Database Support:

• PostgreSQL / Oracle → support PERCENTILE_CONT(0.5) and PERCENTILE_DISC(0.5) which directly calculate the median.

• SQL Server / MySQL (8.0+) → require window function logic (ROW_NUMBER, NTILE, etc.).

• Older MySQL versions → need subqueries with LIMIT and OFFSET tricks.

✅ In short:

• SQL doesn’t usually provide a direct MEDIAN() function.

• You calculate it by ordering rows and picking the middle one (or averaging the two middle ones).

• Some databases (PostgreSQL, Oracle) make it easier with built-in percentile functions, while others require custom queries.

Read More :

How do you join two tables in SQL?

Difference between inner join, left join, and right join.

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