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Snippet Name: SUM

Description: The function returns the sum, for each node in every argument node-set, of the result of converting the string-values of the node to a number. If some arguments are not node-sets, they are converted to numbers first.

Note that this definition differs from XPATH 1.0 standard, where sum() function must have exactly one argument of type node-set. It is important that other XPATH processors may quietly ignore all arguments except the first one, producing unexpected results.

Being called without arguments, sum() will return zero.

Also see:
» RANK
» REGR_SLOPE
» VARIANCE
» VAR_SAMP
» VAR_POP
» STDDEV_SAMP
» STDDEV_POP
» STDDEV
» ROW_NUMBER
» REGR_SYY
» REGR_SXY
» REGR_SXX
» REGR_R2
» REGR_INTERCEPT
» REGR_COUNT
» REGR_AVGY
» REGR_AVGX
» Number Functions: RATIO_TO_REPORT
» Number Functions: RANK
» PERCENTILE_DISC
» PERCENTILE_CONT
» PERCENT_RANK
» OVER PARTITION BY
» NTILE
» MIN
» MAX
» LEAD
» LAST_VALUE
» LAST
» LAG

Comment: (none)

Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 02nd, 2009

CREATE TABLE vote_count (
submit_date  DATE NOT NULL,
num_votes    NUMBER NOT NULL);
 
INSERT INTO vote_count VALUES (TRUNC(SYSDATE)-4, 100);
INSERT INTO vote_count VALUES (TRUNC(SYSDATE)-3, 150);
INSERT INTO vote_count VALUES (TRUNC(SYSDATE)-2, 75);
INSERT INTO vote_count VALUES (TRUNC(SYSDATE)-3, 25);
INSERT INTO vote_count VALUES (TRUNC(SYSDATE)-1, 50);
COMMIT;
 
SELECT * FROM vote_count;
 
SELECT submit_date, num_votes, SUM(num_votes)
OVER(ORDER BY submit_date ROWS UNBOUNDED PRECEDING) TOT_VOTE
FROM vote_count
ORDER BY submit_date; 


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