## Purpose of the Oracle COVAR_SAMP Function

## Syntax – Aggregate Function

COVAR_SAMP (expression1, expression2)

## Parameters – Aggregate Function

The parameters of the COVAR_SAMP function are:

- expression1 (mandatory): The first set of numbers to use in the calculation.
- expression2 (mandatory): The second set of numbers to use in the calculation.

## Examples – Aggregate Function

```
SELECT COVAR_SAMP(fees_paid, fees_required) AS cvsamp
FROM student;
```

Result:

CVSAMP |

7669.551282 |

## Syntax – Analytic Function

If you want to use the COVAR_SAMP function as an analytic function, the syntax is:

COVAR_SAMP (expression1, expression2) OVER (analytic_clause)

The only difference here is the addition of the analytic_clause, which is quite common for analytic queries.

## Parameters – Analytic Function

- expression1 (mandatory): The first set of numbers to use in the calculation.
- expression2 (mandatory): The second set of numbers to use in the calculation.
- analytic_clause (mandatory): This defines how the analytic function operates. It includes a query partition clause, order by clause, and a windowing clause.

## Examples – Analytic Function

```
SELECT first_name,
last_name,
COVAR_SAMP(fees_paid, fees_required) OVER (ORDER BY first_name) AS cvsamp
FROM student;
```

FIRST_NAME | LAST_NAME | CVSAMP |

Andrew | Cooper | |

Jarrad | Winston | 5000 |

John | Smith | -33916.66667 |

John | Rogers | -33916.66667 |

Julie | Armstrong | 8500 |

Mark | Anderson | -9046.428571 |

Mark | Holloway | -9046.428571 |

Mary | Taylor | -7209.821429 |

Michelle | Randall | -7209.821429 |

Robert | Pickering | 859.7222222 |

Steven | Webber | 6752.222222 |

Susan | Johnson | 8001.363636 |

Tanya | Hall | 8731.818182 |

Tom | Capper | 7669.551282 |

## Similar Functions

Some functions which are similar to the COVAR_SAMP function are:

- COVAR_POP – returns the population covariance of a set of number pairs.
- CORR – returns the coefficient of correlation of a set of number pairs.
- VAR_SAMP – returns the sample variance of a set of numbers
- VAR_POP – returns the population variance of a set of numbers

If you want to know more about SQL functions, you can find a full list of Oracle SQL functions here.

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