MySQL 一列上的 SQL 连接 LIKE 另一列

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时间:2020-08-31 16:24:47  来源:igfitidea点击:

SQL Join on a column LIKE another column

mysqlsqljoinsql-like

提问by Don P

Possible Duplicate:
mysql join query using like?

可能的重复:
mysql join 查询使用 like?

I want to do a join where one column contains a string from another table's column:

我想做一个连接,其中一列包含另一个表列中的字符串:

SELECT
a.first_name,
b.age
FROM names a
JOIN ages b
ON b.full_name LIKE '%a.first_name%'

Is this possible? I'm using MySQL. Of course the above query will not work since the LIKE '%a.first_name%' will just look for the string a.first_name, and not the column's actual value.

这可能吗?我正在使用 MySQL。当然,上面的查询将不起作用,因为 LIKE '%a.first_name%' 将只查找字符串 a.first_name,而不是列的实际值。

回答by colin-higgins

You only need to concatenate the strings, you could also do a search and replace.

您只需要连接字符串,您也可以进行搜索和替换。

SELECT
    a.first_name,
    b.age
FROM names a
JOIN ages b
ON b.full_name LIKE '%' + a.first_name + '%'

回答by fthiella

You can use CONCAT:

您可以使用 CONCAT:

SELECT
  a.first_name,
  b.age
FROM
  names a JOIN ages b
    ON b.full_name LIKE CONCAT('%', a.first_name, '%')

or also LOCATE, that returns the position of the first occurrence of a.first_namein b.full_name:

或者还有LOCATE,它返回第一次出现a.first_namein的位置b.full_name

SELECT
  a.first_name,
  b.age
FROM
  names a JOIN ages b
  ON LOCATE(a.first_name, b.full_name)

if there's a match, the join will succeed.

如果有匹配项,则连接将成功。