是否可以在一个查询中将字符串附加到多个匹配行

Question

例如，我有以下 table：

Id	Name	Color
1	FirstCar	White
2	SecondCar	Yellow
3	ThirdCar	Red
4	FourthCar	White
5	FifthCar	Green
6	SixthCar	Blue

我需要实现的目标：将字符串“_123”附加到字段“Name”，用于“Name”为“SecondCar”、“FourthCar”或“SixthCar”的所有行，结果如下：

Id	Name	Color
1	FirstCar	White
2	SecondCar_123	Yellow
3	ThirdCar	Red
4	FourthCar_123	White
5	FifthCar	Green
6	SixthCar_123	Blue

我该怎么做？

Answer 1

您可以使用 CONCAT，它将在我们匹配的 where name in ('SecondCar','FourthCar','SixthCar') 条件下应用 _123。

UPDATE test set name = CONCAT(name,'_123') 
WHERE name IN ('SecondCar','FourthCar','SixthCar');

https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=fd790f9f30fecdb2f3dc22cb2d8ca0a5

注。这将更新现有数据

Answer 2

使用 CASE WHEN statement together with a CONCAT 函数非常简单：

SELECT
  id,
  CASE
    WHEN name IN ("SecondCar", "FourthCar", "SixthCar")
      THEN CONCAT(name, "_123")
    ELSE name
  END AS name,
  color
FROM your_table;

是否可以在一个查询中将字符串附加到多个匹配行

Is it possible to append string to many matching rows in one query

mysql

sql