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Oracle/PLSQL COVAR_POP function
Oracle/PLSQL COVAR_POP function returns covariance of a set of pairs of numbers.
Oracle/PLSQL syntax of COVAR_POP function
COVAR_POP(expression1_id expression2_id )
where:
- expression1_id, expression2_id – numeric expressions
Note:
The function COVAR_POP removes all pairs where expression1_id or expression2_id has zero value.
Function COVAR_POP returns a numeric value.
Application:
You can use COVAR_POP function in the following versions of Oracle/PLSQL:
| Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i |
Let’s consider an example of function COVAR_POP to understand how to use function COVAR_POP in Oracle/PLSQL.
SELECT job1_id,
COVAR_POP(SYSDATE-hire_date_id, salary_id) AS covar_pop_id,
COVAR_SAMP(SYSDATE-hire_date_id, salary_id) AS covar_samp_id
FROM empls
WHERE depart_id in (50, 80)
GROUP BY job1_id
ORDER BY job1_id, covar_pop_id, covar_samp_id;
--result:
JOB1_ID COVAR_POP_id COVAR_SAMP_id
---------- ----------- -----------
SA_MAN1 660700 825875
SA_REP1 579988.466 600702.34
SH_CLERK1 212432.5 223613.158
ST_CLERK1 176577.25 185870.789
ST_MAN1 436092 545115
PL/SQL tutorial: Oracle COVAR_POP Function
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