array_slice

Description

Returns a slice of an array. This function intercepts length elements from input from the position specified by offset.

Syntax

array_slice(input, offset, length)

Parameters

• input: the array whose slice you want to intercept. This function supports the following types of array elements: BOOLEAN, TINYINT, SMALLINT, INT, BIGINT, LARGEINT, FLOAT, DOUBLE, VARCHAR, DECIMALV2, DATETIME, DATE, and JSON. JSON is supported from 2.5.

• offset: the position from which to intercept elements. Valid values start from 1. It must be a BIGINT value.

• length: the length of the slice that you want to intercept. It must be a BIGINT value.

Return value

Returns an array that have the same data type as the array specified by the input parameter.

Usage notes

• The offset starts from 1.
• If the specified length exceeds the actual number of elements that can be intercepted, all the matching elements are returned. See Example 4.

Examples

Example 1: Intercept 2 elements starting from the third element.

mysql> select array_slice([1,2,4,5,6], 3, 2) as res;
+-------+
| res   |
+-------+
| [4,5] |
+-------+

Example 2: Intercept 2 elements starting from the first element.

mysql> select array_slice(["sql","storage","query","execute"], 1, 2) as res;
+-------------------+
| res               |
+-------------------+
| ["sql","storage"] |
+-------------------+

Example 3: Null elements are treated as normal values.

mysql> select array_slice([57.73,97.32,128.55,null,324.2], 3, 3) as res;
+---------------------+
| res                 |
+---------------------+
| [128.55,null,324.2] |
+---------------------+

Example 4: Intercept 5 elements starting from the third element.

This function intends to intercept 5 elements but there are only 3 elements from the third element. As a result, all of these 3 elements are returned.

mysql> select array_slice([57.73,97.32,128.55,null,324.2], 3, 5) as res;
+---------------------+
| res                 |
+---------------------+
| [128.55,null,324.2] |
+---------------------+