STDDEV([DISTINCT | ALL] value) [OVER (analytic_clause)]: returns the standard deviation value : STDDEV « Analytical Functions « Oracle PL / SQL






  1. Oracle PL / SQL
  2. Analytical Functions
  3. STDDEV

STDDEV([DISTINCT | ALL] value) [OVER (analytic_clause)]: returns the standard deviation value



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> -- STDDEV([DISTINCT | ALL] value) [OVER (analytic_clause)]: returns the standard deviation value.
SQL>
SQL> -- STDDEV([DISTINCT | ALL] value) [OVER (analytic_clause)]
SQL>
SQL> SELECT STDDEV(y) FROM TestTable;

 STDDEV(Y)
----------
28.3847573

SQL>
SQL> drop table TestTable;

Table dropped.

SQL>
SQL>
SQL>
SQL>








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1.STDDEV(x): get the standard deviation of x