getSubstrFunction

string public
\Bitrix\Main\DB\MssqlSqlHelper::getSubstrFunction(
 string $str,
 integer $from,
 integer $length = null
);

This non-static method returns SQL function to get part of string.

If length is null or omitted, the substring starting from start until the end of the string will be returned.

Parameters $str and $from parameters are SQL unsafe.

Parameter	Description	Version
$str	Database field or expression.
$from	Start position.
$length	Maximum length.