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COVAR_SAMP Function in Oracle SQL – PLSQL

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The COVAR_SAMP Function in Oracle SQL / PLSQL is used to calculate the sample covariance of a set of numbers in pairs.

Syntax for the using the COVAR_SAMP Function in Oracle SQL / PLSQL is:

SELECT COVAR_SAMP(expression_1, expression_2)
FROM table_name;

  • expression_1 and expression_2 are numeric expressions
  • The COVAR_SAMP function in Oracle SQL / PLSQL will eliminate all the pairs where expression_1 and expression_2 are having NULL values.

Example:

Using COVAR_SAMP Function in Oracle SQL / PLSQL SELECT statement:

Suppose we have a table named ‘employee’ as shown below:

Employee_ID Employee_Name Salary Department Commission
101 Emp A 10000 Sales  
102 Emp B 20000 IT 20
103 Emp C 28000 IT 20
104 Emp D 30000 Support  
105 Emp E 32000 Sales 10
106 Emp F 40000 Sales 10
107 Emp G 12000 Sales 10
108 Emp H 12000 Support  

If we write our COVAR_SAMP Function query as:

SELECT COVAR_SAMP(salary, commission)
FROM employee;

We will get ‘-7500’ as output