MySQL与其他表的数据更新

Question

i been reading and trying alot of the answers to similiar problem. i need to update table test field brand with the content of field name from table brands. i do this select to check fields that need to be update:

SELECT brand.name,test.`1_name` 
FROM test  INNER JOIN brand 
ON test.`1_name` LIKE CONCAT('%',brand.name,'%')

the above give me a result of 32000 records. i try to use that select inside an update with

UPDATE `test` SET brand=(....)

but couldnt get it to work.

Answer 1

Try this :

UPDATE `test` SET brand=(SELECT brand.name FROM test  INNER JOIN brand ON test.`1_name` LIKE CONCAT('%',brand.name,'%'))

The query you posted returns a collections of data ( SELECT brand.name,test.1_name ... ), SET brand = ` needs a scalar value.

In other words, ensure that your query returns only one result.