STDDEV_SAMP(expr) [OVER(analytic_clause)]: computes the cumulative sample standard deviation : STDDEV_SAMP « Analytical Functions « Oracle PL / SQL

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

STDDEV_SAMP(expr) [OVER(analytic_clause)]: computes the cumulative sample standard deviation

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_SAMP(expr) [OVER(analytic_clause)]: computes the cumulative sample standard deviation. 
     --It gives the square root of the sample variance.
SQL>
SQL> --STDDEV_SAMP(expr) [OVER(analytic_clause)]
SQL>
SQL> SELECT STDDEV_SAMP(y) FROM TestTable;

STDDEV_SAMP(Y)
--------------
    28.3847573

SQL>
SQL> drop table TestTable;

Table dropped.

SQL>
SQL>
SQL>
SQL>
           
       

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