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MySQL | CONCAT method

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String
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's CONCAT(~) method returns a concatenated string from the string inputs.

Parameters

1. str1 | string

A string to concatenate.

2. str2 | string | optional

Any number of strings may be provided as input.

Return value

A concatenated string.

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 space in between:

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

To provide an alias for the resulting column using AS:

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

Numeric argument

Numeric arguments are automatically converted to strings:

SELECT CONCAT(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 argument

NULL is returned if any argument is NULL:

SELECT CONCAT('Hello', NULL);
+-----------------------+
| CONCAT('Hello', NULL) |
+-----------------------+
| NULL |
+-----------------------+
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Published by Arthur Yanagisawa
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