mysql CONCATENATE

在MySQL中，可以使用Concat()函数来拼接（concatenate）两个或多个字符串或列的值。该函数将值联结在一起，形成一个单独的值。使用Concat()函数可以在SELECT语句中将不同列或字符串连接起来，如在vendors表中将vend_name和vend_country列的值拼接在一起。例如，下面的查询将vend_name和vend_country列的值拼接在一起，并在结果中加上括号：

SELECT Concat(vend_name, ' (', vend_country, ')')
FROM vendorsORDER BY vend_name;

这将返回一个结果集，其中的每一行都包含了拼接后的值，类似于以下结果：

ACME (USA)
Anvils R Us (USA)
Furball Inc. (USA)
Jet Set (England)
Jouets Et Ours (France)
LT Supplies (USA)

通过使用Concat()函数，我们可以方便地在SELECT查询中将不同的列或字符串值拼接在一起，以满足特定的需求。

相关问题

mysql concat

The CONCAT function in MySQL is used to concatenate two or more strings into a single string. It takes two or more string arguments and returns a single string that is the result of concatenating the input strings.

Syntax:

CONCAT(string1, string2, ...)

Example:

SELECT CONCAT('Hello', 'World');

Output:

HelloWorld

In addition to the CONCAT function, MySQL also provides the CONCAT_WS function which allows you to specify a separator between the input strings.

Syntax:

CONCAT_WS(separator, string1, string2, ...)

Example:

SELECT CONCAT_WS('-', 'John', 'Doe', 'Smith');

Output:

John-Doe-Smith

mysql workbench concant

To concatenate strings in MySQL Workbench, you can use the CONCAT() function. Here is an example:

SELECT CONCAT(first_name, ' ', last_name) AS full_name FROM employees;

This will combine the first_name and last_name columns with a space in between to create a full_name column. You can also concatenate multiple strings together by separating them with commas inside the CONCAT() function.