Oracle PL/SQL/Analytical Functions/COVAR POP
COVAR_POP(expr1, expr2): returns a population covariance between expr1 and expr2
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SQL> SQL> SQL> create table TestTable (
2 x number primary key, 3 y number 4 );
Table created. SQL> insert into TestTable values (1, 7 ); 1 row created. SQL> insert into TestTable values (2, 1 ); 1 row created. SQL> insert into TestTable values (3, 2 ); 1 row created. SQL> insert into TestTable values (4, 5 ); 1 row created. SQL> insert into TestTable values (5, 7 ); 1 row created. SQL> insert into TestTable values (6, 34 ); 1 row created. SQL> insert into TestTable values (7, 32 ); 1 row created. SQL> insert into TestTable values (8, 43 ); 1 row created. SQL> insert into TestTable values (9, 87 ); 1 row created. SQL> SQL> select * from TestTable;
X Y
----------
1 7 2 1 3 2 4 5 5 7 6 34 7 32 8 43 9 87
9 rows selected. SQL> SQL> -- COVAR_POP(expr1, expr2): returns a population covariance between expr1 and expr2. SQL> SQL> SQL> -- COVAR_POP(expr1, expr2) SQL> SQL> SQL> SELECT COVAR_POP(y, x) FROM TestTable; COVAR_POP(Y,X)
59.4444444
SQL> SQL> drop table TestTable; Table dropped. SQL> SQL> SQL>
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