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If length is omitted, the substring starting from start until the end of the string will be returned. Example #2 Using a negative length.
Метод substr начинает собирать строку с позиции start и заканчивает, когда соберет length или дойдет до конца строки. Если start больше или равен длине строки, то substr возвращает пустую строку.
Метод substr() возвращает указанное количество символов из строки, начиная с указанной позиции.
The SUBSTR function takes a character matrix as an argument (along with starting positions and lengths) and produces a character matrix with the same dimensions as the argument. Elements of the result matrix are substrings of the corresponding argument elements.
One of them, which is called substr, can be used to select a substring from the input. Here is its syntax: substr(s, a, b) : it returns b number of chars from string s, starting at position a. The parameter b is optional, in which case it means up to the end of
Если этот параметр не указан, функция SUBSTR вернет всю строку. Примечание. Если start_position равно 0, то функция SUBSTR примет
substr -- Возвращает подстроку. Описание. string substr ( string string, int start [, int length] ).
Say I have a table column that has results like: … I would like to be able to write a query that selects this column from said table, but only returns the substring up to the Underscore (_) character.