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MySQL | RPAD method

Database
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MySQL
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Functions
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String
schedule Mar 10, 2022
Last updated
local_offer MySQL
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tocTable of Contents
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MySQL's RPAD(~) method returns the string argument, right-padded with the pad string up to a certain length.

Parameters

1. str | string

The string that is to be right-padded.

2. len | number

The length of the return string.

If the original str is longer than the provided len, the original str will be truncated.

3. padstr | string

The string to perform padding with.

Return value

Case

Return value

Right-padded string of length len

str shorter than len

Original string

str same length as len

str longer than len

str truncated to length len

Examples

Consider the following table about some students:

student_id

fname

lname

day_enrolled

age

username

1

Sky

Towner

2015-12-03

17

stowner1

2

Ben

Davis

2016-04-20

19

bdavis2

3

Travis

Apple

2018-08-14

18

tapple3

4

Arthur

David

2016-04-01

16

adavid4

5

Benjamin

Town

2014-01-01

17

btown5

The above sample table can be created using the code here.

Basic usage

To right-pad student first names to length 6 characters with '*' as the padding string:

SELECT fname, RPAD(fname, 6, '*')
FROM students;
+----------+---------------------+
| fname | RPAD(fname, 6, '*') |
+----------+---------------------+
| Sky | Sky*** |
| Ben | Ben*** |
| Travis | Travis |
| Arthur | Arthur |
| Benjamin | Benjam |
+----------+---------------------+

Note that:

  • 'Sky' and 'Ben' were right-padded to length 6 characters with '*'

  • 'Travis' and 'Arthur' were returned untouched as they were 6 characters exactly.

  • 'Benjamin' was truncated to 'Benjam' as it was longer than 6 characters.

Truncation will keep characters starting from the left:

SELECT RPAD('hello', 1, '??');
+------------------------+
| RPAD('hello', 1, '??') |
+------------------------+
| h |
+------------------------+

All characters to the right of the 1st character are truncated.

robocat
Published by Isshin Inada
Edited by 0 others
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