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Add support for the TOTAL() aggregate function - works like SUM() except

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that it returns 0 instead of NULL when presented with an empty list. (CVS 2930)

FossilOrigin-Name: a7f528ff3446d50b280fb0b85063879e3ac5751a
This commit is contained in:
drh
2006-01-12 22:17:50 +00:00
parent 0e6082eb83
commit a97fdd3bfc
5 changed files with 39 additions and 19 deletions
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8
test/null.test
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@ -102,6 +102,14 @@ do_test null-3.1 {
}
} {7 4 6 2 3 0.5 0.5 0 1}
# The sum of zero entries is a NULL, but the total of zero entries is 0.
#
do_test null-3.2 {
execsql {
SELECT sum(b), total(b) FROM t1 WHERE b<0
}
} {{} 0.0}
# Check to see how WHERE clauses handle NULL values. A NULL value
# is the same as UNKNOWN. The WHERE clause should only select those
# rows that are TRUE. FALSE and UNKNOWN rows are rejected.