Important

Self-managed SingleStore will soon transition from version 9.1 RC to version 10. This new semantic versioning scheme will provide SingleStore with finer control over engine and feature releases that were not possible with the current versioning scheme.

In the interim, SingleStore 9.1 RC can be used to preview, evaluate, and provide feedback on the new and upcoming features in SingleStore 10 prior to its general availability. Ahead of this transition, SingleStore 9.0 is recommended for production workloads, which can later be upgraded to SingleStore 10.

STD

Syntax

STD returns NULL if there are not matching rows.

Aggregate Function

SQL

STD ( expression )

Window Function

SQL

STD (col | expr ) OVER ( [PARTITION BY (col | expr )] [ORDER BY (col | expr ) ] )

Arguments

expression: any expression. This may be a column name, the result of another function, or a math operation.

Return Type

A double.

Examples

SQL

CREATE TABLE player_scores(player_name VARCHAR(50), player_id VARCHAR(10),
    1st_qtr_score DECIMAL(5,2), 2nd_qtr_score DECIMAL(5,2),
    3rd_qtr_score DECIMAL(5,2), 4th_qtr_score DECIMAL(5,2),
    yearly_total AS 1st_qtr_score + 2nd_qtr_score + 3rd_qtr_score + 4th_qtr_score PERSISTED DECIMAL(5,2));

INSERT INTO player_scores VALUES
    ('Steve', '119','22.50','72.00', '63.00', '45.00'),
    ('Jack', '432', '90.10', '78.00','88.20', '92.20'),
    ('Jim', '779','75.00', '68.90','55.70', '72.00'),
    ('Eve', '189','91.50', '88.10', '95.00', '94.50'),
    ('Shelia','338', '75.60', '72.00', '81.10', '78.40'),
    ('June', '521', '81.00', '87.30','76.80','82.20'),
    ('Martin', '674','98.80', '95.10', '88.00', '96.40');

Aggregate Function

SQL

SELECT STD(yearly_total) FROM player_scores;

+-------------------+
| STD(yearly_total) |
+-------------------+
|         57.083158 |
+-------------------+

Window Function

SQL

SELECT player_name, yearly_total,
ROUND(std(yearly_total) OVER (ORDER BY player_name, yearly_total)) as std
FROM player_scores
ORDER BY player_name;

+-------------+--------------+------+
| player_name | yearly_total | std  |
+-------------+--------------+------+
| Eve         |       369.10 |    0 |
| Eve         |       369.10 |    0 |
| Jack        |       348.50 |   10 |
| Jack        |       348.50 |   10 |
| Jim         |       271.60 |   42 |
| Jim         |       271.60 |   42 |
| June        |       327.30 |   36 |
| June        |       327.30 |   36 |
| Martin      |       378.30 |   38 |
| Martin      |       378.30 |   38 |
| Shelia      |       307.10 |   37 |
| Shelia      |       307.10 |   37 |
| Steve       |       202.50 |   57 |
| Steve       |       202.50 |   57 |
+-------------+--------------+------+

STD

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Syntax

Aggregate Function

Window Function

Arguments

Return Type

Examples

Aggregate Function

Window Function

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