How to write division in sql

SQL division uses the / operator. When the divisor is an integer, the integer is returned and the decimal is discarded. When the divisor is a decimal, the floating point is returned and the decimal place is retained. Dividing by 0 will report an error, and the result will be negative if the sign is different. You can use the ROUND() function to preserve a specified number of decimal places, and convert the number to floating point to avoid loss of precision.

Division in SQL

How to perform division?

Use / operators for division in SQL.

When the divisor is an integer

If the divisor is an integer, SQL will return an integer result and the decimal part will be discarded. For example:

SELECT 10 / 3;  -- 返回 3

When the divisor is a decimal

If the divisor is a decimal, SQL will return a floating point result with decimal places retained. For example:

SELECT 10 / 3.5;  -- 返回 2.857142857142857

Special cases

• Dividing by 0: Dividing by 0 returns an error.
• The result is negative: If the signs of the dividend and divisor are different, the result will be negative.

Use the ROUND() function

To retain a specific number of decimal places, you can use the ROUND() function. For example:

SELECT ROUND(10 / 3.5, 2);  -- 返回 2.86

Avoid loss of precision

To avoid loss of precision, it is recommended to convert the number to floating point before performing division. For example:

SELECT CAST(10 AS FLOAT) / CAST(3.5 AS FLOAT);  -- 返回 2.857142857142857

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