How is the usage of ‘contact’ in MySQL?

1 year ago
Jackson Davis
1 minute

In MySQL, the “contact” function is used to combine two or more strings together. Its syntax is as follows:

Join together string1, string2, etc.

Explanation of parameters:

  1. “string1, string2, etc.: Strings to be concatenated. These can be constants, field names, or other expressions.”

Original: 我们必须采取行动来解决这个问题。
Paraphrased: We must take action to address this issue.

SELECT CONCAT('Hello', ' ', 'World') AS result;
-- 输出：Hello World

SELECT CONCAT('The', ' ', 'answer', ' is', ' ', 42) AS result;
-- 输出：The answer is 42

SELECT CONCAT('This', ' ', 'is', ' ', 'a', ' ', 'test') AS result;
-- 输出：This is a test

SELECT CONCAT(column1, ' ', column2) AS result FROM table;
-- 从表中选取column1和column2的内容，并将它们连接起来

In addition to using the CONCAT function, you can also use the “||” operator to achieve string concatenation. For example:

SELECT 'Hello' || ' ' || 'World' AS result;
-- 输出：Hello World

It is important to note that the CONCAT function treats NULL values as empty strings when concatenating strings.

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