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257. SQRT Function

Learn how to calculate the square root of a numeric value.

📘 Lesson 257 of 728 ⏱ 8 min 🎯 Intermediate

The SQRT function returns the square root of a numeric value where supported by the database.

Square-root calculations appear in statistical formulas, mathematical models, and analytical calculations.

Calculate the square root of a numeric measurement.

SQL 
SELECT
    SQRT(VarianceValue) AS StandardDeviationComponent
FROM StatisticsData;

SQRT can be used in statistics, analytical modeling, scientific calculations, and specialized business calculations.

  • SQRT returns a square root.
  • The input normally needs to be non-negative.
  • It is useful in mathematical analysis.
  • It can support statistical calculations.
  • Database support is widely available.
What does SQRT do?

SQRT returns the square root of a numeric value.

Can SQRT normally process negative numbers?

A standard real-number square root is not defined for negative values, so database behavior may produce an error or special result.

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