GoogleSQL for Spanner supports the following general aggregate functions. To learn about the syntax for aggregate function calls, see Aggregate function calls .
Function list
| Name | Summary |
|---|---|
ANY_VALUE
|
Gets an expression for some row. |
ARRAY_AGG
|
Gets an array of values. |
ARRAY_CONCAT_AGG
|
Concatenates arrays and returns a single array as a result. |
AVG
|
Gets the average of non- NULL
values. |
BIT_AND
|
Performs a bitwise AND operation on an expression. |
BIT_OR
|
Performs a bitwise OR operation on an expression. |
BIT_XOR
|
Performs a bitwise XOR operation on an expression. |
COUNT
|
Gets the number of rows in the input, or the number of rows with an
expression evaluated to any value other than NULL
. |
COUNTIF
|
Gets the number of TRUE
values for an expression. |
LOGICAL_AND
|
Gets the logical AND of all non- NULL
expressions. |
LOGICAL_OR
|
Gets the logical OR of all non- NULL
expressions. |
MAX
|
Gets the maximum non- NULL
value. |
MIN
|
Gets the minimum non- NULL
value. |
STDDEV
|
An alias of the STDDEV_SAMP
function.For more information, see Statistical aggregate functions . |
STDDEV_SAMP
|
Computes the sample (unbiased) standard deviation of the values. For more information, see Statistical aggregate functions . |
STRING_AGG
|
Concatenates non- NULL
STRING
or BYTES
values. |
SUM
|
Gets the sum of non- NULL
values. |
VAR_SAMP
|
Computes the sample (unbiased) variance of the values. For more information, see Statistical aggregate functions . |
VARIANCE
|
An alias of VAR_SAMP
.For more information, see Statistical aggregate functions . |
ANY_VALUE
ANY_VALUE
(
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns expression
for some row chosen from the group. Which row is chosen is
nondeterministic, not random. Returns NULL
when the input produces no
rows. Returns NULL
when expression
or expression2
is NULL
for all rows in the group.
If expression
contains any non-NULL values, then ANY_VALUE
behaves as if IGNORE NULLS
is specified;
rows for which expression
is NULL
aren't considered and won't be
selected.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
Any
Returned Data Types
Matches the input data type.
Examples
SELECT
ANY_VALUE
(
fruit
)
as
any_value
FROM
UNNEST
(
[
"apple"
,
"banana"
,
"pear"
]
)
as
fruit
;
/*-----------*
| any_value |
+-----------+
| apple |
*-----------*/
WITH
Store
AS
(
SELECT
20
AS
sold
,
"apples"
AS
fruit
UNION
ALL
SELECT
30
AS
sold
,
"pears"
AS
fruit
UNION
ALL
SELECT
30
AS
sold
,
"bananas"
AS
fruit
UNION
ALL
SELECT
10
AS
sold
,
"oranges"
AS
fruit
)
SELECT
ANY_VALUE
(
fruit
HAVING
MAX
sold
)
AS
a_highest_selling_fruit
FROM
Store
;
/*-------------------------*
| a_highest_selling_fruit |
+-------------------------+
| pears |
*-------------------------*/
WITH
Store
AS
(
SELECT
20
AS
sold
,
"apples"
AS
fruit
UNION
ALL
SELECT
30
AS
sold
,
"pears"
AS
fruit
UNION
ALL
SELECT
30
AS
sold
,
"bananas"
AS
fruit
UNION
ALL
SELECT
10
AS
sold
,
"oranges"
AS
fruit
)
SELECT
ANY_VALUE
(
fruit
HAVING
MIN
sold
)
AS
a_lowest_selling_fruit
FROM
Store
;
/*-------------------------*
| a_lowest_selling_fruit |
+-------------------------+
| oranges |
*-------------------------*/
ARRAY_AGG
ARRAY_AGG
(
[
DISTINCT
]
expression
[
{
IGNORE
|
RESPECT
}
NULLS
]
[
HAVING
{
MAX
|
MIN
}
expression2
]
[
ORDER
BY
key
[
{
ASC
|
DESC
}
]
[
,
...
]
]
[
LIMIT
n
]
)
Description
Returns an ARRAY of expression
values.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
All data types except ARRAY.
Returned Data Types
ARRAY
If there are zero input rows, this function returns NULL
.
Examples
SELECT
ARRAY_AGG
(
x
)
AS
array_agg
FROM
UNNEST
(
[
2
,
1
,
-
2
,
3
,
-
2
,
1
,
2
]
)
AS
x
;
/*-------------------------*
| array_agg |
+-------------------------+
| [2, 1, -2, 3, -2, 1, 2] |
*-------------------------*/
SELECT
ARRAY_AGG
(
DISTINCT
x
)
AS
array_agg
FROM
UNNEST
(
[
2
,
1
,
-
2
,
3
,
-
2
,
1
,
2
]
)
AS
x
;
/*---------------*
| array_agg |
+---------------+
| [2, 1, -2, 3] |
*---------------*/
SELECT
ARRAY_AGG
(
x
IGNORE
NULLS
)
AS
array_agg
FROM
UNNEST
(
[
NULL
,
1
,
-
2
,
3
,
-
2
,
1
,
NULL
]
)
AS
x
;
/*-------------------*
| array_agg |
+-------------------+
| [1, -2, 3, -2, 1] |
*-------------------*/
SELECT
ARRAY_AGG
(
x
ORDER
BY
ABS
(
x
))
AS
array_agg
FROM
UNNEST
(
[
2
,
1
,
-
2
,
3
,
-
2
,
1
,
2
]
)
AS
x
;
/*-------------------------*
| array_agg |
+-------------------------+
| [1, 1, 2, -2, -2, 2, 3] |
*-------------------------*/
SELECT
ARRAY_AGG
(
x
LIMIT
5
)
AS
array_agg
FROM
UNNEST
(
[
2
,
1
,
-
2
,
3
,
-
2
,
1
,
2
]
)
AS
x
;
/*-------------------*
| array_agg |
+-------------------+
| [2, 1, -2, 3, -2] |
*-------------------*/
WITH
vals
AS
(
SELECT
1
x
UNION
ALL
SELECT
-
2
x
UNION
ALL
SELECT
3
x
UNION
ALL
SELECT
-
2
x
UNION
ALL
SELECT
1
x
)
SELECT
ARRAY_AGG
(
DISTINCT
x
ORDER
BY
x
)
as
array_agg
FROM
vals
;
/*------------*
| array_agg |
+------------+
| [-2, 1, 3] |
*------------*/
WITH
vals
AS
(
SELECT
1
x
,
'a'
y
UNION
ALL
SELECT
1
x
,
'b'
y
UNION
ALL
SELECT
2
x
,
'a'
y
UNION
ALL
SELECT
2
x
,
'c'
y
)
SELECT
x
,
ARRAY_AGG
(
y
)
as
array_agg
FROM
vals
GROUP
BY
x
;
/*---------------*
| x | array_agg |
+---------------+
| 1 | [a, b] |
| 2 | [a, c] |
*---------------*/
ARRAY_CONCAT_AGG
ARRAY_CONCAT_AGG
(
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
[
ORDER
BY
key
[
{
ASC
|
DESC
}
]
[
,
...
]
]
[
LIMIT
n
]
)
Description
Concatenates elements from expression
of type ARRAY
, returning a single
array as a result.
This function ignores NULL
input arrays, but respects the NULL
elements in
non- NULL
input arrays. Returns NULL
if there are zero input rows or expression
evaluates to NULL
for all rows.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
ARRAY
Returned Data Types
ARRAY
Examples
SELECT
ARRAY_CONCAT_AGG
(
x
)
AS
array_concat_agg
FROM
(
SELECT
[
NULL
,
1
,
2
,
3
,
4
]
AS
x
UNION
ALL
SELECT
NULL
UNION
ALL
SELECT
[
5
,
6
]
UNION
ALL
SELECT
[
7
,
8
,
9
]
);
/*-----------------------------------*
| array_concat_agg |
+-----------------------------------+
| [NULL, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
*-----------------------------------*/
SELECT
ARRAY_CONCAT_AGG
(
x
ORDER
BY
ARRAY_LENGTH
(
x
))
AS
array_concat_agg
FROM
(
SELECT
[
1
,
2
,
3
,
4
]
AS
x
UNION
ALL
SELECT
[
5
,
6
]
UNION
ALL
SELECT
[
7
,
8
,
9
]
);
/*-----------------------------------*
| array_concat_agg |
+-----------------------------------+
| [5, 6, 7, 8, 9, 1, 2, 3, 4] |
*-----------------------------------*/
SELECT
ARRAY_CONCAT_AGG
(
x
LIMIT
2
)
AS
array_concat_agg
FROM
(
SELECT
[
1
,
2
,
3
,
4
]
AS
x
UNION
ALL
SELECT
[
5
,
6
]
UNION
ALL
SELECT
[
7
,
8
,
9
]
);
/*--------------------------*
| array_concat_agg |
+--------------------------+
| [1, 2, 3, 4, 5, 6] |
*--------------------------*/
SELECT
ARRAY_CONCAT_AGG
(
x
ORDER
BY
ARRAY_LENGTH
(
x
)
LIMIT
2
)
AS
array_concat_agg
FROM
(
SELECT
[
1
,
2
,
3
,
4
]
AS
x
UNION
ALL
SELECT
[
5
,
6
]
UNION
ALL
SELECT
[
7
,
8
,
9
]
);
/*------------------*
| array_concat_agg |
+------------------+
| [5, 6, 7, 8, 9] |
*------------------*/
AVG
AVG
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns the average of non- NULL
values in an aggregated group.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Caveats:
- If the aggregated group is empty or the argument is
NULLfor all rows in the group, returnsNULL. - If the argument is
NaNfor any row in the group, returnsNaN. - If the argument is
[+|-]Infinityfor any row in the group, returns either[+|-]InfinityorNaN. - If there is numeric overflow, produces an error.
- If a floating-point type is returned, the result is non-deterministic , which means you might receive a different result each time you use this function.
Supported Argument Types
- Any numeric input type
-
INTERVAL
Returned Data Types
| INPUT | INT64
|
NUMERIC
|
FLOAT32
|
FLOAT64
|
INTERVAL
|
|---|---|---|---|---|---|
|
OUTPUT
|
FLOAT64
|
NUMERIC
|
FLOAT64
|
FLOAT64
|
INTERVAL
|
Examples
SELECT
AVG
(
x
)
as
avg
FROM
UNNEST
(
[
0
,
2
,
4
,
4
,
5
]
)
as
x
;
/*-----*
| avg |
+-----+
| 3 |
*-----*/
SELECT
AVG
(
DISTINCT
x
)
AS
avg
FROM
UNNEST
(
[
0
,
2
,
4
,
4
,
5
]
)
AS
x
;
/*------*
| avg |
+------+
| 2.75 |
*------*/
BIT_AND
BIT_AND
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Performs a bitwise AND operation on expression
and returns the result.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
- INT64
Returned Data Types
INT64
Examples
SELECT
BIT_AND
(
x
)
as
bit_and
FROM
UNNEST
(
[
0xF001
,
0x00A1
]
)
as
x
;
/*---------*
| bit_and |
+---------+
| 1 |
*---------*/
BIT_OR
BIT_OR
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Performs a bitwise OR operation on expression
and returns the result.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
- INT64
Returned Data Types
INT64
Examples
SELECT
BIT_OR
(
x
)
as
bit_or
FROM
UNNEST
(
[
0xF001
,
0x00A1
]
)
as
x
;
/*--------*
| bit_or |
+--------+
| 61601 |
*--------*/
BIT_XOR
BIT_XOR
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Performs a bitwise XOR operation on expression
and returns the result.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
- INT64
Returned Data Types
INT64
Examples
SELECT
BIT_XOR
(
x
)
AS
bit_xor
FROM
UNNEST
(
[
5678
,
1234
]
)
AS
x
;
/*---------*
| bit_xor |
+---------+
| 4860 |
*---------*/
SELECT
BIT_XOR
(
x
)
AS
bit_xor
FROM
UNNEST
(
[
1234
,
5678
,
1234
]
)
AS
x
;
/*---------*
| bit_xor |
+---------+
| 5678 |
*---------*/
SELECT
BIT_XOR
(
DISTINCT
x
)
AS
bit_xor
FROM
UNNEST
(
[
1234
,
5678
,
1234
]
)
AS
x
;
/*---------*
| bit_xor |
+---------+
| 4860 |
*---------*/
COUNT
COUNT
(
*
)
COUNT
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Gets the number of rows in the input or the number of rows with an
expression evaluated to any value other than NULL
.
Definitions
-
*: Use this value to get the number of all rows in the input. -
expression: A value of any data type that represents the expression to evaluate. IfDISTINCTis present,expressioncan only be a data type that is groupable . -
DISTINCT: To learn more, see Aggregate function calls . -
HAVING { MAX | MIN }: To learn more, see Aggregate function calls .
Details
To count the number of distinct values of an expression for which a certain condition is satisfied, you can use the following recipe:
COUNT
(
DISTINCT
IF
(
condition
,
expression
,
NULL
))
IF
returns the value of expression
if condition
is TRUE
, or NULL
otherwise. The surrounding COUNT(DISTINCT ...)
ignores the NULL
values, so it counts only the distinct values of expression
for which condition
is TRUE
.
To count the number of non-distinct values of an expression for which a
certain condition is satisfied, consider using the COUNTIF
function.
Return type
INT64
Examples
You can use the COUNT
function to return the number of rows in a table or the
number of distinct values of an expression. For example:
SELECT
COUNT
(
*
)
AS
count_star
,
COUNT
(
DISTINCT
x
)
AS
count_dist_x
FROM
UNNEST
(
[
1
,
4
,
4
,
5
]
)
AS
x
;
/*------------+--------------*
| count_star | count_dist_x |
+------------+--------------+
| 4 | 3 |
*------------+--------------*/
SELECT
COUNT
(
*
)
AS
count_star
,
COUNT
(
x
)
AS
count_x
FROM
UNNEST
(
[
1
,
4
,
NULL
,
4
,
5
]
)
AS
x
;
/*------------+---------*
| count_star | count_x |
+------------+---------+
| 5 | 4 |
*------------+---------*/
The following query counts the number of distinct positive values of x
:
SELECT
COUNT
(
DISTINCT
IF
(
x
>
0
,
x
,
NULL
))
AS
distinct_positive
FROM
UNNEST
(
[
1
,
-
2
,
4
,
1
,
-
5
,
4
,
1
,
3
,
-
6
,
1
]
)
AS
x
;
/*-------------------*
| distinct_positive |
+-------------------+
| 3 |
*-------------------*/
The following query counts the number of distinct dates on which a certain kind of event occurred:
WITH
Events
AS
(
SELECT
DATE
'2021-01-01'
AS
event_date
,
'SUCCESS'
AS
event_type
UNION
ALL
SELECT
DATE
'2021-01-02'
AS
event_date
,
'SUCCESS'
AS
event_type
UNION
ALL
SELECT
DATE
'2021-01-02'
AS
event_date
,
'FAILURE'
AS
event_type
UNION
ALL
SELECT
DATE
'2021-01-03'
AS
event_date
,
'SUCCESS'
AS
event_type
UNION
ALL
SELECT
DATE
'2021-01-04'
AS
event_date
,
'FAILURE'
AS
event_type
UNION
ALL
SELECT
DATE
'2021-01-04'
AS
event_date
,
'FAILURE'
AS
event_type
)
SELECT
COUNT
(
DISTINCT
IF
(
event_type
=
'FAILURE'
,
event_date
,
NULL
))
AS
distinct_dates_with_failures
FROM
Events
;
/*------------------------------*
| distinct_dates_with_failures |
+------------------------------+
| 2 |
*------------------------------*/
The following query counts the number of distinct id
s that exist in both
the customers
and vendor
tables:
WITH
customers
AS
(
SELECT
1934
AS
id
,
'a'
AS
team
UNION
ALL
SELECT
2991
,
'b'
UNION
ALL
SELECT
3988
,
'c'
),
vendors
AS
(
SELECT
1934
AS
id
,
'd'
AS
team
UNION
ALL
SELECT
2991
,
'e'
UNION
ALL
SELECT
4366
,
'f'
)
SELECT
COUNT
(
DISTINCT
IF
(
id
IN
(
SELECT
id
FROM
customers
),
id
,
NULL
))
AS
result
FROM
vendors
;
/*--------*
| result |
+--------+
| 2 |
*--------*/
COUNTIF
COUNTIF
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Gets the number of TRUE
values for an expression.
Definitions
-
expression: ABOOLvalue that represents the expression to evaluate. -
DISTINCT: To learn more, see Aggregate function calls . -
HAVING { MAX | MIN }: To learn more, see Aggregate function calls .
Details
The function signature COUNTIF(DISTINCT ...)
is generally not useful. If you
would like to use DISTINCT
, use COUNT
with DISTINCT IF
. For more
information, see the COUNT
function.
Return type
INT64
Examples
SELECT
COUNTIF
(
x<0
)
AS
num_negative
,
COUNTIF
(
x>0
)
AS
num_positive
FROM
UNNEST
(
[
5
,
-
2
,
3
,
6
,
-
10
,
-
7
,
4
,
0
]
)
AS
x
;
/*--------------+--------------*
| num_negative | num_positive |
+--------------+--------------+
| 3 | 4 |
*--------------+--------------*/
LOGICAL_AND
LOGICAL_AND
(
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns the logical AND of all non- NULL
expressions. Returns NULL
if there
are zero input rows or expression
evaluates to NULL
for all rows.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
BOOL
Return Data Types
BOOL
Examples
LOGICAL_AND
returns FALSE
because not all of the values in the array are
less than 3.
SELECT
LOGICAL_AND
(
x
<
3
)
AS
logical_and
FROM
UNNEST
(
[
1
,
2
,
4
]
)
AS
x
;
/*-------------*
| logical_and |
+-------------+
| FALSE |
*-------------*/
LOGICAL_OR
LOGICAL_OR
(
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns the logical OR of all non- NULL
expressions. Returns NULL
if there
are zero input rows or expression
evaluates to NULL
for all rows.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
BOOL
Return Data Types
BOOL
Examples
LOGICAL_OR
returns TRUE
because at least one of the values in the array is
less than 3.
SELECT
LOGICAL_OR
(
x
<
3
)
AS
logical_or
FROM
UNNEST
(
[
1
,
2
,
4
]
)
AS
x
;
/*------------*
| logical_or |
+------------+
| TRUE |
*------------*/
MAX
MAX
(
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns the maximum non- NULL
value in an aggregated group.
Caveats:
- If the aggregated group is empty or the argument is
NULLfor all rows in the group, returnsNULL. - If the argument is
NaNfor any row in the group, returnsNaN.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
Any orderable data type
except for ARRAY
.
Return Data Types
The data type of the input values.
Examples
SELECT
MAX
(
x
)
AS
max
FROM
UNNEST
(
[
8
,
37
,
55
,
4
]
)
AS
x
;
/*-----*
| max |
+-----+
| 55 |
*-----*/
MIN
MIN
(
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns the minimum non- NULL
value in an aggregated group.
Caveats:
- If the aggregated group is empty or the argument is
NULLfor all rows in the group, returnsNULL. - If the argument is
NaNfor any row in the group, returnsNaN.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
Any orderable data type
except for ARRAY
.
Return Data Types
The data type of the input values.
Examples
SELECT
MIN
(
x
)
AS
min
FROM
UNNEST
(
[
8
,
37
,
4
,
55
]
)
AS
x
;
/*-----*
| min |
+-----+
| 4 |
*-----*/
STRING_AGG
STRING_AGG
(
[
DISTINCT
]
expression
[
,
delimiter
]
[
HAVING
{
MAX
|
MIN
}
expression2
]
[
ORDER
BY
key
[
{
ASC
|
DESC
}
]
[
,
...
]
]
[
LIMIT
n
]
)
Description
Returns a value (either STRING
or BYTES
) obtained by concatenating
non- NULL
values. Returns NULL
if there are zero input rows or expression
evaluates to NULL
for all rows.
If a delimiter
is specified, concatenated values are separated by that
delimiter; otherwise, a comma is used as a delimiter.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Supported Argument Types
Either STRING
or BYTES
.
Return Data Types
Either STRING
or BYTES
.
Examples
SELECT
STRING_AGG
(
fruit
)
AS
string_agg
FROM
UNNEST
(
[
"apple"
,
NULL
,
"pear"
,
"banana"
,
"pear"
]
)
AS
fruit
;
/*------------------------*
| string_agg |
+------------------------+
| apple,pear,banana,pear |
*------------------------*/
SELECT
STRING_AGG
(
fruit
,
" & "
)
AS
string_agg
FROM
UNNEST
(
[
"apple"
,
"pear"
,
"banana"
,
"pear"
]
)
AS
fruit
;
/*------------------------------*
| string_agg |
+------------------------------+
| apple & pear & banana & pear |
*------------------------------*/
SELECT
STRING_AGG
(
DISTINCT
fruit
,
" & "
)
AS
string_agg
FROM
UNNEST
(
[
"apple"
,
"pear"
,
"banana"
,
"pear"
]
)
AS
fruit
;
/*-----------------------*
| string_agg |
+-----------------------+
| apple & pear & banana |
*-----------------------*/
SELECT
STRING_AGG
(
fruit
,
" & "
ORDER
BY
LENGTH
(
fruit
))
AS
string_agg
FROM
UNNEST
(
[
"apple"
,
"pear"
,
"banana"
,
"pear"
]
)
AS
fruit
;
/*------------------------------*
| string_agg |
+------------------------------+
| pear & pear & apple & banana |
*------------------------------*/
SELECT
STRING_AGG
(
fruit
,
" & "
LIMIT
2
)
AS
string_agg
FROM
UNNEST
(
[
"apple"
,
"pear"
,
"banana"
,
"pear"
]
)
AS
fruit
;
/*--------------*
| string_agg |
+--------------+
| apple & pear |
*--------------*/
SELECT
STRING_AGG
(
DISTINCT
fruit
,
" & "
ORDER
BY
fruit
DESC
LIMIT
2
)
AS
string_agg
FROM
UNNEST
(
[
"apple"
,
"pear"
,
"banana"
,
"pear"
]
)
AS
fruit
;
/*---------------*
| string_agg |
+---------------+
| pear & banana |
*---------------*/
SUM
SUM
(
[
DISTINCT
]
expression
[
HAVING
{
MAX
|
MIN
}
expression2
]
)
Description
Returns the sum of non- NULL
values in an aggregated group.
To learn more about the optional aggregate clauses that you can pass into this function, see Aggregate function calls .
Caveats:
- If the aggregated group is empty or the argument is
NULLfor all rows in the group, returnsNULL. - If the argument is
NaNfor any row in the group, returnsNaN. - If the argument is
[+|-]Infinityfor any row in the group, returns either[+|-]InfinityorNaN. - If there is numeric overflow, produces an error.
- If a floating-point type is returned, the result is non-deterministic , which means you might receive a different result each time you use this function.
Supported Argument Types
- Any supported numeric data type
-
INTERVAL
Return Data Types
| INPUT | INT64
|
NUMERIC
|
FLOAT32
|
FLOAT64
|
INTERVAL
|
|---|---|---|---|---|---|
|
OUTPUT
|
INT64
|
NUMERIC
|
FLOAT64
|
FLOAT64
|
INTERVAL
|
Examples
SELECT
SUM
(
x
)
AS
sum
FROM
UNNEST
(
[
1
,
2
,
3
,
4
,
5
,
4
,
3
,
2
,
1
]
)
AS
x
;
/*-----*
| sum |
+-----+
| 25 |
*-----*/
SELECT
SUM
(
DISTINCT
x
)
AS
sum
FROM
UNNEST
(
[
1
,
2
,
3
,
4
,
5
,
4
,
3
,
2
,
1
]
)
AS
x
;
/*-----*
| sum |
+-----+
| 15 |
*-----*/
SELECT
SUM
(
x
)
AS
sum
FROM
UNNEST
(
[]
)
AS
x
;
/*------*
| sum |
+------+
| NULL |
*------*/
