Usage of MySQL ELT function

The ELT function in MySQL is one of the functions used for string processing. It is used to select a string from a given string list and determine which string to return based on the specified index position. The syntax of the ELT function is "ELT(index, string1, string2, string3, ...)", where index is the index position of the string to be selected, and string1, string2, string3, ... are the characters to be selected. string list.

The ELT function in MySQL is one of the functions used for string processing. It is used to select a string from a given string list and determine which one to return based on the specified index position. string.

The syntax of the ELT function is as follows:

ELT(index, string1, string2, string3, ...)

Among them, index is the index position of the string to be selected, string1, string2, string3, ... is the list of strings to be selected.

Here are some examples of using ELT functions:

Example 1:

SELECT ELT(1, 'Apple', 'Banana', 'Cherry', 'Date');

Output: Apple

In this example, the index position is 1, So the first string is returned, which is 'Apple'.

Example 2:

SELECT ELT(4, 'Apple', 'Banana', 'Cherry', 'Date');

Output: Date

In this example, the index position is 4, which exceeds the length of the string list, so a string list is returned The last string in , which is 'Date'.

Example 3:

SELECT ELT(3, 'Apple', 'Banana', 'Cherry', 'Date');

Output: Cherry

In this example, the index position is 3, and the third string in the string list is returned, that is 'Cherry'.

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