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SUM

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Calculate the sum of a set of numbers.

NULL values are ignored. If no values can be summed, this function returns NULL.

May be used as a window function and with the frame clause.

Syntax

Aggregate Function

SUM ( [DISTINCT] expression )

Window Function & Window Frame Clause

SUM ( [DISTINCT] expr ) OVER (
 [PARTITION BY expr]
 [ORDER BY expr  ] [<window_frame_function>]
)

Arguments

  • DISTINCT: optional keyword. If present, will sum the unique values.

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

Return Type

A double if the input type is double, otherwise decimal.

Examples

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

SELECT SUM(1st_qtr_score), SUM(2nd_qtr_score) FROM player_scores;
+--------------------+--------------------+
| SUM(1st_qtr_score) | SUM(2nd_qtr_score) |
+--------------------+--------------------+
|             534.50 |             561.40 |
+--------------------+--------------------+

Window Function

SELECT player_name, 1st_qtr_score, 2nd_qtr_score,
SUM(1st_qtr_score + 2nd_qtr_score) OVER (PARTITION BY 1st_qtr_score ORDER BY 2nd_qtr_score) sum_1st_half
FROM player_scores
ORDER BY player_name;

Window Frame Clause

SELECT player_name, 3rd_qtr_score, 4th_qtr_score,
SUM(3rd_qtr_score + 4th_qtr_score) OVER (PARTITION BY 3rd_qtr_score order by 4th_qtr_score ROWS between UNBOUNDED PRECEDING and CURRENT ROW) sum_2nd_half
FROM player_scores
ORDER BY player_name;
+-------------+---------------+---------------+--------------+
| player_name | 3rd_qtr_score | 4th_qtr_score | sum_2nd_half |
+-------------+---------------+---------------+--------------+
| Eve         |         95.00 |         94.50 |       189.50 |
| Jack        |         88.20 |         92.20 |       180.40 |
| Jim         |         55.70 |         72.00 |       127.70 |
| June        |         76.80 |         82.20 |       159.00 |
| Martin      |         88.00 |         96.40 |       184.40 |
| Shelia      |         81.10 |         78.40 |       159.50 |
| Steve       |         63.00 |         45.00 |       108.00 |
+-------------+---------------+---------------+--------------+

Last modified: February 23, 2023

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