Tencent Cloud

Recent Pages

Array Functions

마지막 업데이트 시간:2024-01-22 10:57:48

This document introduces the basic syntax and examples of array functions.
Function
Syntax
Description
Subscript operator: []
[x]
Returns an element from an array. Equivalent to the `element_at` function.
array_agg
array_agg(x)
Returns all values in `x` as an array.
array_distinct
array_distinct(x)
Deduplicates an array and returns unique values from the array.
array_except
array_except(x, y)
Returns the difference between the `x` and `y` arrays.
array_intersect
array_intersect(x, y)
Returns the intersection between the `x` and `y` arrays.
array_join
array_join(x, delimiter)
Concatenates the elements in an array using the specified delimiter. If the array contains a null element, the null element is ignored.Note: For the `array_join` function, the maximum return result supported is 1 KB, and data exceeding 1 KB will be truncated.
﻿
array_join(x, delimiter, null_replacement)
Concatenates the elements in an array using `delimiter` and uses `null_replacement` to replace null values.Note: For the `array_join` function, the maximum return result supported is 1 KB, and data exceeding 1 KB will be truncated.
array_max
array_max(x)
Returns the maximum value of an array.
array_min
array_max(x)
Returns the minimum value of an array.
array_position
array_position(x, element)
Returns the subscript (starting from 1) of a specified element. If the specified element does not exist, return `0`.
array_remove
array_remove(x, element)
Removes a specified element from an array.
array_sort
array_sort(x)
Sorts elements in an array in ascending order. If there are null elements, the null elements will be placed at the end of the returned array.
array_union
array_union(x, y)
Returns the union of two arrays.
cardinality
cardinality(x)
Calculates the number of elements in an array.
concat
concat(x, y...)
Concatenates multiple arrays into one.
contains
contains(x, element)
Determines whether an array contains a specified element and returns `true` if the array contains the element.
element_at
element_at(x, y)
Returns the yth element of an array.
filter
filter(x, lambda_expression)
Filters elements in an array and returns only the elements that comply with the Lambda expression.
flatten
flatten(x)
Converts a two-dimensional array to a one-dimensional array.
reduce
reduce(x, lambda_expression)
Adds the elements in the array as defined by the Lambda expression and returns the result.
reverse
reverse(x)
Reverses the elements in an array.
sequence
sequence(x, y)
Returns an array of consecutive and increasing values within the specified starting value range. The increment interval is the default value 1.
﻿
sequence(x, y, step)
Returns an array of consecutive and increasing values within the specified starting value range. The increment interval is `step`.
shuffle
shuffle(x)
Randomizes the elements in an array.
slice
slice(x, start, length)
Returns a subset of an array.
transform
transform(x, lambda_expression)
Applies a Lambda expression to each element of an array.
zip
	zip(x, y)
Combines multiple arrays into a two-dimensional array (elements with the same subscript in each original array form a new array).
zip_with
zip_with(x, y, lambda_expression)
Merges two arrays into one as defined by a Lambda expression.
Subscript Operator []
The subscript operator ([]) is used to return the xth element in an array. It is equivalent to the element_at function.
Syntax
[x]
Parameter description
Parameter
Description
x
Array subscript, starting from 1. The parameter value is of the bigint type.
Returned value type
Return the data type of the specified element.
Sample
Return the second element of the number field value.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT cast(json_parse(array) as array(bigint)) [2]
Search and analysis result
23
array_agg
The array_agg function is used to return all values in x as an array.
Syntax
array_agg(x)
Parameter description
Parameter
Description
x
The parameter value can be of any data type.
Returned value type
Array
Sample
Return the values of the status field as an array.
Search and analysis statement
* | SELECT array_agg(status) AS array
Search and analysis result
[200,200,200,404,200,200]
array_distinct
The array_distinct function is used to delete duplicate elements from an array.
Syntax
array_distinct(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Array
Sample
Delete duplicate elements from the array field.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT array_distinct(cast(json_parse(array) as array(bigint)))
Search and analysis result
[12,23,26,48]
array_except
The array_except function is used to calculate the difference between two arrays.
Syntax
array_except(x, y)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
y
The parameter value is of the array type.
Returned value type
Array
Sample
Calculate the difference between arrays [1,2,3,4,5] and [1,3,5,7].
Search and analysis statement
* | SELECT array_except(array[1,2,3,4,5],array[1,3,5,7])
Search and analysis result
[2,4]
array_intersect
The array_intersect function is used to calculate the intersection between two arrays.
Syntax
array_intersect(x, y)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
y
The parameter value is of the array type.
Returned value type
Array
Sample
Calculate the difference between arrays [1,2,3,4,5] and [1,3,5,7].
Search and analysis statement
* | SELECT array_intersect(array[1,2,3,4,5],array[1,3,5,7])
Search and analysis result
[1,3,5]
array_join
The array_join function is used to concatenate the elements in an array into a string using the specified delimiter.
Syntax
Concatenate the elements in an array into a string using the specified delimiter. If the array contains null elements, the null elements are ignored.
array_join(x, delimiter)
Concatenate the elements in an array into a string using the specified delimiter. If the array contains null elements, the null elements are replaced with null_replacement.
array_join(x, delimiter, null_replacement)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
delimiter
Connector, which can be a string.
null_replacement
String used to replace a null element.
Returned value type
Varchar
Sample
Use spaces to concatenate the elements in the [null,'China','sh'] array as a string, and replace the null element with region.
Search and analysis statement
* | SELECT array_join(array[null,'China','sh'],'/','region')
Search and analysis result
region/China/sh
array_max
The array_max function is used to get the maximum value of an array.
Syntax
array_max(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Same as the element data type of the parameter value.
Sample
Get the maximum value 48 from the [12,23,26,48,26] array.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT array_max(try_cast(json_parse(array) as array(bigint))) AS max_number
Search and analysis result
48
array_min
The array_min function is used to get the minimum value of an array.
Syntax
array_min(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Same as the element data type of the parameter value.
Sample
Get the minimum value 12 from the [12,23,26,48,26] array.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT array_min(try_cast(json_parse(array) as array(bigint))) AS min_number
Search and analysis result
12
array_position
The array_position function is used to get the subscript (starting from 1) of a specified element. If the specified element does not exist, return 0.
Syntax
array_position(x, element)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
element
Element in an array.
Returned value type
Bigint
Sample
Return the subscript of 46 in the [23,46,35] array.
Search and analysis statement
* | SELECT array_position(array[23,46,35],46)
Search and analysis result
2
array_remove
The array_remove function is used to delete a specified element from an array.
Syntax
array_remove(x, element)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
element
Element in an array.
Returned value type
Array
Sample
Delete 23 from the [23,46,35] array.
Search and analysis statement
* | SELECT array_remove(array[23,46,35],23)
Search and analysis result
[46,35]
array_sort
The array_sort function is used to sort elements in an array in ascending order.
Syntax
array_sort(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Array
Sample
Sort elements in the ['b', 'd', null, 'c', 'a'] array in ascending order.
Search and analysis statement
* | SELECT array_sort(array['b','d',null,'c','a'])
Search and analysis result
["a","b","c","d",null]
array_union
The array_union function is used to calculate the union of two arrays.
Syntax
array_union(x, y)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
y
The parameter value is of the array type.
Returned value type
Array
Sample
Calculate the union of the arrays [1,2,3,4,5] and [1,3,5,7].
Search and analysis statement
* | SELECT array_union(array[1,2,3,4,5],array[1,3,5,7])
Search and analysis result
[1,2,3,4,5,7]
cardinality
The cardinality function is used to calculate the number of elements in an array.
Syntax
cardinality(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Bigint
Sample
Calculate the number of elements in the number field value.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT cardinality(cast(json_parse(array) as array(bigint)))
Search and analysis result
5
concat
The concat function is used to concatenate multiple arrays into one.
Syntax
concat(x, y...)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
y
The parameter value is of the array type.
Returned value type
Array
Sample
Concatenate the arrays ['red','blue'] and ['yellow','green'] into one array.
Search and analysis statement
* | SELECT concat(array['red','blue'],array['yellow','green'])
Search and analysis result
["red","blue","yellow","green"]
contains
The contains function is used to determine whether an array contains a specified element and return true if the array contains the element.
Syntax
contains(x, element)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
element
Element in an array.
Returned value type
Boolean
Sample
Determine whether the array field value contains 23.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT contains(cast(json_parse(array) as array(varchar)),'23')
Search and analysis result
TRUE
element_at
The element_at function is used to return the yth element in an array.
Syntax
element_at(x, y)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
element
Array subscript, starting from 1. The parameter value is of the bigint type.
Returned value type
Any data type
Sample
Return the second element of the number field value.
Field sample
array:[12,23,26,48,26]
Search and analysis statement
* | SELECT element_at(cast(json_parse(number) AS array(varchar)), 2)
Search and analysis result
23
filter
The filter function is used to filter elements in an array and return only the elements that comply with a specified Lambda expression
Syntax
filter(x, lambda_expression)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
lambda_expression
Lambda expression. For more information, see Lambda Function.
Returned value type
Array
Sample
Return elements greater than 0 in the [5,-6,null,7] array, where x -> x > 0 is the Lambda expression.
Search and analysis statement
* | SELECT filter(array[5,-6,null,7],x -> x > 0)
Search and analysis result
[5,7]
flatten
The flatten function is used to convert a two-dimensional array to a one-dimensional array.
Syntax
flatten(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Array
Sample
Convert the two-dimensional array "array[1,2,3,4],array[4,3,2,1]" into a one-dimensional array.
Search and analysis statement
* | SELECT flatten(array[array[1,2,3,4],array[4,3,2,1]])
Search and analysis result
[1,2,3,4,4,3,2,1]
reduce
The reduce function is used to add the elements in an array as defined by the Lambda expression and return the result.
Syntax
reduce(x, lambda_expression)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
lambda_expression
Lambda expression. For more information, see Lambda Function.
Returned value type
Bigint
Sample
Return the sum of the elements in array [5, 20, 50].
Search and analysis statement
* | SELECT reduce(array[5,20,50],0,(s, x) -> s + x, s -> s)
Search and analysis result
75
reverse
The reverse function is used to reverse the elements in an array.
Syntax
reverse(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Array
Sample
Reverse the elements in array [1,2,3,4,5].
Search and analysis statement
* | SELECT reverse(array[1,2,3,4,5])
Search and analysis result
[5,4,3,2,1]
sequence
The sequence function is used to return an array of consecutive and increasing values within the specified starting value range.
Syntax
The increment interval is the default value 1.
sequence(x, y)
The increment interval is custom.
sequence(x, y, step)
Parameter description
Parameter
Description
x
The parameter value is of the bigint or timestamp type (UNIX timestamp or date and time expression).
y
The parameter value is of the bigint or timestamp type (UNIX timestamp or date and time expression).
step
Value interval.If the parameter value is a date and time expression, the format of step is as follows:
interval  'n' year to month: the interval is n years.
interval  'n' day to second: the interval is n days.
Returned value type
Array
Sample
Example 1. Return even numbers between 0 and 10.
Search and analysis statement
* | SELECT sequence(0,10,2)
Search and analysis result
[0,2,4,6,8,10]
Example 2. Return dates between 2017-10-23 and 2021-08-12 at an interval of one year.
Search and analysis statement
* | SELECT sequence(from_unixtime(1508737026),from_unixtime(1628734085),interval '1' year to month )
Search and analysis result
["2017-10-23 05:37:06.0","2018-10-23 05:37:06.0","2019-10-23 05:37:06.0","2020-10-23 05:37:06.0"]
Example 3. Return UNIX timestamps between 1628733298 and 1628734085 at an interval of 60 seconds.
Search and analysis statement
* | SELECT sequence(1628733298,1628734085,60)
Search and analysis result
[1628733298,1628733358,1628733418,1628733478,1628733538,1628733598,1628733658,1628733718,1628733778,1628733838,1628733898,1628733958,1628734018,1628734078]
shuffle
shuffle
The shuffle function is used to randomize the elements in an array.
Syntax
shuffle(x)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
Returned value type
Array
Sample
Randomize the elements in the [1,2,3,4,5] array.
Search and analysis statement
* | SELECT shuffle(array[1,2,3,4,5])
Search and analysis result
[5,2,4,1,3]
slice
The slice function is used to return a subset of an array.
Syntax
slice(x, start, length)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
start
Index start position.
If start is negative, start from the end.
If start is positive, start from the beginning.
length
Number of elements in a subset.
Returned value type
Array
Sample
Return a subset of the [1,2,4,5,6,7,7] array, starting from the third element and consisting of two elements.
Search and analysis statement
* | SELECT slice(array[1,2,4,5,6,7,7],3,2)
Search and analysis result
[4,5]
transform
The transform function is used to apply a Lambda expression to each element of an array.
Syntax
transform(x, lambda_expression)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
lambda_expression
Lambda expression. For more information, see Lambda Function.
Returned value type
Array
Sample
Increment each element in the [5,6] array by 1 and return.
Search and analysis statement
* | SELECT transform(array[5,6],x -> x + 1)
Search and analysis result
[6,7]
zip
The zip function is used to combine multiple arrays into a two-dimensional array, and elements with the same subscript in each original array form a new array.
Syntax
zip(x, y)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
y
The parameter value is of the array type.
Returned value type
Array
Sample
Combine the arrays [1,2] and [3,4] into a two-dimensional array.
Search and analysis statement
* | SELECT zip(array[1,2], array[3,4])
Search and analysis result
["{1, 3}","{2, 4}"]
zip_with
The zip_with function is used to merge two arrays into one as defined by a Lambda expression.
Syntax
zip_with(x, y, lambda_expression)
Parameter description
Parameter
Description
x
The parameter value is of the array type.
y
The parameter value is of the array type.
lambda_expression
Lambda expression. For more information, see Lambda Function.
Returned value type
Array
Sample
Use Lambda expression (x, y) -> x + y to add the elements in arrays [1,2] and [3,4], respectively, and return the sum results as an array.
Search and analysis statement
* | SELECT zip_with(array[1,2], array[3,4],(x,y) -> x + y)
Search and analysis result
[4,6]
﻿

문의하기

고객의 업무에 전용 서비스를 제공해드립니다.

기술 지원

더 많은 도움이 필요하시면, 티켓을 통해 연락 바랍니다. 티켓 서비스는 연중무휴 24시간 제공됩니다.

연중무휴 24시간 전화 지원

Function	Syntax	Description
Subscript operator: []	[x]	Returns an element from an array. Equivalent to the `element_at` function.
array_agg	array_agg(x)	Returns all values in `x` as an array.
array_distinct	array_distinct(x)	Deduplicates an array and returns unique values from the array.
array_except	array_except(x, y)	Returns the difference between the `x` and `y` arrays.
array_intersect	array_intersect(x, y)	Returns the intersection between the `x` and `y` arrays.
array_join	array_join(x, delimiter)	Concatenates the elements in an array using the specified delimiter. If the array contains a null element, the null element is ignored.Note: For the `array_join` function, the maximum return result supported is 1 KB, and data exceeding 1 KB will be truncated.
array_join		array_join(x, delimiter, null_replacement)	Concatenates the elements in an array using `delimiter` and uses `null_replacement` to replace null values.Note: For the `array_join` function, the maximum return result supported is 1 KB, and data exceeding 1 KB will be truncated.
array_max	array_max(x)	Returns the maximum value of an array.
array_min	array_max(x)	Returns the minimum value of an array.
array_position	array_position(x, element)	Returns the subscript (starting from 1) of a specified element. If the specified element does not exist, return `0`.
array_remove	array_remove(x, element)	Removes a specified element from an array.
array_sort	array_sort(x)	Sorts elements in an array in ascending order. If there are null elements, the null elements will be placed at the end of the returned array.
array_union	array_union(x, y)	Returns the union of two arrays.
cardinality	cardinality(x)	Calculates the number of elements in an array.
concat	concat(x, y...)	Concatenates multiple arrays into one.
contains	contains(x, element)	Determines whether an array contains a specified element and returns `true` if the array contains the element.
element_at	element_at(x, y)	Returns the yth element of an array.
filter	filter(x, lambda_expression)	Filters elements in an array and returns only the elements that comply with the Lambda expression.
flatten	flatten(x)	Converts a two-dimensional array to a one-dimensional array.
reduce	reduce(x, lambda_expression)	Adds the elements in the array as defined by the Lambda expression and returns the result.
reverse	reverse(x)	Reverses the elements in an array.
sequence	sequence(x, y)	Returns an array of consecutive and increasing values within the specified starting value range. The increment interval is the default value 1.
sequence		sequence(x, y, step)	Returns an array of consecutive and increasing values within the specified starting value range. The increment interval is `step`.
shuffle	shuffle(x)	Randomizes the elements in an array.
slice	slice(x, start, length)	Returns a subset of an array.
transform	transform(x, lambda_expression)	Applies a Lambda expression to each element of an array.
zip	zip(x, y)	Combines multiple arrays into a two-dimensional array (elements with the same subscript in each original array form a new array).
zip_with	zip_with(x, y, lambda_expression)	Merges two arrays into one as defined by a Lambda expression.

Parameter	Description
x	Array subscript, starting from 1. The parameter value is of the bigint type.

Parameter	Description
x	The parameter value can be of any data type.

Parameter	Description
x	The parameter value is of the array type.

Parameter	Description
x	The parameter value is of the bigint or timestamp type (UNIX timestamp or date and time expression).
y	The parameter value is of the bigint or timestamp type (UNIX timestamp or date and time expression).
step	Value interval.If the parameter value is a date and time expression, the format of `step` is as follows: interval 'n' year to month: the interval is `n` years. interval 'n' day to second: the interval is `n` days.

tencent cloud

가입하기

로그인

Recent Pages

Array Functions

Subscript Operator []

Syntax

Parameter description

Returned value type

Sample

array_agg

Syntax

Parameter description

Returned value type

Sample

array_distinct

Syntax

Parameter description

Returned value type

Sample

array_except

Syntax

Parameter description

Returned value type

Sample

array_intersect

Syntax

Parameter description

Returned value type

Sample

array_join

Syntax

Parameter description

Returned value type

Sample

array_max

Syntax

Parameter description

Returned value type

Sample

array_min

Syntax

Parameter description

Returned value type

Sample

array_position

Syntax

Parameter description

Returned value type

Sample

array_remove

Syntax

Parameter description

Returned value type

Sample

array_sort

Syntax

Parameter description

Returned value type

Sample

array_union

Syntax

Parameter description

Returned value type

Sample

cardinality

Syntax

Parameter description

Returned value type

Sample

concat

Syntax

Parameter description

Returned value type

Sample

contains

Syntax

Parameter description

Returned value type

Sample