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VAR_SAMP | Snowflake Documentation

Categories:

Aggregate functions (General) , Window function syntax and usage (General)

Returns the sample variance of non-NULL records in a group. If all records inside a group are NULL, a NULL is returned.

Aliases:

VARIANCE , VARIANCE_SAMP

Aggregate function

VAR_SAMP( [DISTINCT] <expr1> )

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Window function

VAR_SAMP( <expr1> ) OVER (
                         [ PARTITION BY <expr2> ]
                         [ ORDER BY <expr3> [ ASC | DESC ] [ <window_frame> ] ]
                         )

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For detailed window_frame syntax, see Window function syntax and usage.

expr1

The expr1 should evaluate to one of the numeric data types.

expr2

This is the expression to partition by.

expr3

This is the expression to order by within each partition.

The data type of the returned value is NUMBER(<precision>, <scale>). The scale depends upon the values being processed.

• For single-record inputs, VAR_SAMP, VARIANCE, and VARIANCE_SAMP all return NULL. This is different from the Oracle behavior, where VAR_SAMP returns NULL for a single record and VARIANCE returns 0.

• When passed a VARCHAR expression, this function implicitly casts the input to floating point values. If the cast cannot be performed, an error is returned.

• When this function is called as a window function:

  • The syntax allows the DISTINCT keyword, but it is ignored.

  • If you do not specify a window frame, the following implied window frame is used:

    RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW

    For more information about window frames, including syntax, usage notes, and examples, see Window function syntax and usage.

This example shows how to use the VAR_SAMP function:

Create and fill a table:

create table aggr(k int, v decimal(10,2), v2 decimal(10, 2));
insert into aggr values 
   (1, 10, null),
   (2, 10, 11), 
   (2, 20, 22), 
   (2, 25, null), 
   (2, 30, 35);

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Query the table:

SELECT k, var_samp(v), var_samp(v2) 
    FROM aggr 
    GROUP BY k
    ORDER BY k;
+---+---------------+----------------+
| K |   VAR_SAMP(V) |   VAR_SAMP(V2) |
|---+---------------+----------------|
| 1 |          NULL |           NULL |
| 2 | 72.9166666667 | 144.3333333333 |
+---+---------------+----------------+

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