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MySQL | CONCAT_WS method

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MySQL
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String
schedule Mar 10, 2022
Last updated
local_offer MySQL
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MySQL's CONCAT_WS(~) method concatenates input strings using the specified separator.

Parameters

1. separator | string

The separator to be added between the strings to be concatenated.

2. str1 | string

A string to concatenate with other string inputs.

3. str2 | string

A string to concatenate with other string inputs. Any number of string inputs may be provided.

Return value

A concatenated string with the separator added between the string inputs.

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 concatenate fname and lname with a '*' in between:

SELECT CONCAT_WS('*', fname, lname)
FROM students;
+------------------------------+
| CONCAT_WS('*', fname, lname) |
+------------------------------+
| Sky*Towner |
| Ben*Davis |
| Travis*Apple |
| Arthur*David |
| Benjamin*Town |
+------------------------------+

To provide an alias for the resulting column using AS:

SELECT CONCAT_WS(' ', fname, lname) AS "Full Name"
FROM students;
+---------------+
| Full Name |
+---------------+
| Sky Towner |
| Ben Davis |
| Travis Apple |
| Arthur David |
| Benjamin Town |
+---------------+

Numeric arguments

Numeric arguments are automatically converted to strings:

SELECT CONCAT_WS(' ', fname, 'is', age, 'years old.') AS "Sentence"
FROM students;
+---------------------------+
| Sentence |
+---------------------------+
| Sky is 17 years old. |
| Ben is 19 years old. |
| Travis is 18 years old. |
| Arthur is 16 years old. |
| Benjamin is 17 years old. |
+---------------------------+

NULL arguments

NULL input strings are skipped:

SELECT CONCAT_WS('-', 'Welcome', NULL, 'to', 'SkyTowner!');
+-----------------------------------------------------+
| CONCAT_WS('-', 'Welcome', NULL, 'to', 'SkyTowner!') |
+-----------------------------------------------------+
| Welcome-to-SkyTowner! |
+-----------------------------------------------------+

NULL separator returns NULL:

SELECT CONCAT_WS(NULL, 'Welcome', 'to', 'SkyTowner!');
+------------------------------------------------+
| CONCAT_WS(NULL, 'Welcome', 'to', 'SkyTowner!') |
+------------------------------------------------+
| NULL |
+------------------------------------------------+
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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