MySQL SUBSTRING() Funksie

Onttrek 'n substring uit 'n string (begin by posisie 5, onttrek 3 karakters):

SELECT SUBSTRING("SQL Tutorial", 5, 3) AS ExtractString;

Definisie en gebruik

Die SUBSTRING()-funksie onttrek 'n substring uit 'n string (begin by enige posisie).

Let wel: Die SUBSTR()- en MID()- funksies is gelyk aan die SUBSTRING()-funksie.

SUBSTRING(string, start, length)

OF:

SUBSTRING(string FROM start FOR length)

Parameter	Description
string	Required. The string to extract from
start	Required. The start position. Can be both a positive or negative number. If it is a positive number, this function extracts from the beginning of the string. If it is a negative number, this function extracts from the end of the string
length	Optional. The number of characters to extract. If omitted, the whole string will be returned (from the start position)

Werk in:	Van MySQL 4.0

Onttrek 'n substring uit die teks in 'n kolom (begin by posisie 2, onttrek 5 karakters):

SELECT SUBSTRING(CustomerName, 2, 5) AS ExtractString
FROM Customers;

Onttrek 'n substring uit 'n string (begin van die einde, by posisie -5, onttrek 5 karakters):

SELECT SUBSTRING("SQL Tutorial", -5, 5) AS ExtractString;