The difference between substring and substr in MySQL

The difference between substring and substr

substring

1. Introduction

substring() is based on SQL Server and is used to intercept strings

2. Use

substring(start,stop)

The two parameters are the start and end positions, including "start", excluding "stop", which is [start, stop).That is, the second parameter [stop] is the final subscript of the intercepted string

substr

1. Introduction

substr() is Oracle based

2. Use

substr(start,length)

The first parameter is the starting position, and the second parameter is the length of the intercepted string

The similarities and differences between substring and substr

Similarities

1. Both are functions used to intercept strings.
2. If only one parameter is written, the functions of both are the same: that is to intercept the current subscript of the string until the last string of the stringFragment

var a=”abcdefghiklmnopqrstuvwxyz”;var b=a.substr(5);var c=a.substring(5);console.log(b);console.log(c);

The result of this output is the same, which are all
fghiklmnopqrstuvwxyz intercepted from the fifth subscript 4 to the end

Different

1. The second parameter of the two has completely different meanings;
substr(a,b)
The second parameter is the length of the intercepted string
substring(a,b)
The second parameter is the final subscript of the intercepted string

var a="abcdefghiklmnopqrstuvwxyz";var b=a.substr(3,5);var c=a.substring(3,5);The result of the printout is:defghde

2.substr() is based on Oracle, substring() is based on SQL Server, both substr() and substring() can be applied to MySQL

MySQL: SUBSTR( ), SUBSTRING( )Oracle: SUBSTR( )SQL Server: SUBSTRING( )