![]() MySQL SUBSTRING() function is used to extract a substring from an input string.A substring is part of another original string having continuous series of characters.ExamplesĮxtract a substring from a string where starting index position and length is passed as a parameter:Įxplanation: In the above query, the length parameter is greater than the string length, and thus the entire string will be extended from the starting index position. We will see various examples of the substring() function in the upcoming section. This function works similarly to the above syntax and returns a part of a string starting from an index with the length len. Select substring(String from index for len) This function returns a substring starting from a given index of a specific length len.Ĥ. This way of returning a part of the string is similar to the above way where a part of a string is extracted from a given index position till the whole length of the original string. This function of MySQL() returns a substring of a string from a given index position till the end of the string. Let's see different ways of using this MySQL Substring() Function: The Substring() function works by extracting a particular length of the string from a specified position. How does the MySQL Substring() Function Work? The return value of this MySQL Substring() function is a string data type that is part of an original string. Return Value of MySQL Substring() Function This length parameter is optional and if it is not passed as a parameter in the function, the entire string will be returned, starting at the specified index position and ending with the end of the string. Length variable: The length parameter represents the length of a substring in characters. Note that MySQL indexing starts at 1 (not 0). If positive, this SUBSTRING() function iterates from the beginning of the string, if negative, the function iterates and gets the substring from the end of the string. This variable can have positive or negative values. Starting Index position: The index represents the starting position where you can start retrieving the part of a string. Input String: This string represents an original input string to apply substring extraction. Note: that SUBSTR() is a synonym for SUBSTRING() in MySQL, so they can be used interchangeably.
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