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Concatenates, i.e. combines, the text representations of all the input parameters without a separator, in the order they are provided.

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Syntax

CONCAT( <expression>[, <expression>[, ...n]] );
—OR— 
<expression> || <expression>

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Parameters

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CONCAT function

ParameterDescriptionSupported input types
<expression>[, ...n]The expressions to be concatenated.Any type
The parameters to the CONCAT function can be of any data type, and will be converted to their text representation before concatenation. NULL parameters to the CONCAT function are treated as empty strings and ignored. If all parameters are NULL, the result will be an empty string.

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|| operator

ParameterDescriptionSupported input types
<expression>The expressions to be concatenated.Any non-array type, but at least one TEXT
To enable string concatenation, one parameter to the || operator must be of type TEXT, while the other parameter may be of any non-array data type. If one parameter to the || operator is NULL, the result will also be the non-null parameter; if both parameters are NULL, the result will be NULL. The concatenation operator || can also be used for array concatenation.

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Return Type

TEXT

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Example

The following example concatenates users’ nicknames and emails from the players table: 
SELECT
	CONCAT(nickname, ': ', email) as user_info
FROM players
LIMIT 5;
Returns:
user_info
steven70: daniellegraham@example.net
burchdenise: keith84@example.org
stephanie86: zjenkins@example.org
sabrina21: brianna65@example.org
kennethpark: williamsdonna@example.com