Mysql `AND` operator

Question

Good day! i've got some problem with that query:

SELECT `id`
FROM `test`
WHERE `name`
LIKE "somename" AND `id` = (SELECT max(`id`) FROM test)

It returned an empty result.

But

SELECT `id`
FROM `test`
WHERE `name` LIKE "somename"

works.

Moreover,

SELECT `id`
FROM `test`
WHERE `id` = (SELECT max(`id`) FROM test)

works too.

Why they doesn't work together?

Thanks you!

Answer 1

I think you are probably looking for something like this:

SELECT *
FROM
  test
WHERE
  id=(SELECT max(id) FROM test WHERE name LIKE "somename")

this will return the row from test that has the maximum ID where name is like "somename"

Answer 2

Because they would have to be both true at the same time.

Imagine the following

id    name
1     'somename'
2     'someothername'

In the above case

SELECT `id`
FROM `test`
WHERE `name` LIKE "somename"

Will return the first row but:

SELECT id FROM test WHERE id = (SELECT max(id) FROM test) 

Will return the second. Using AND will mean no results are returned. You may wish to use OR depending on what behaviour you want.

Answer 3

try that:

  SELECT `id`
  FROM `test`
  WHERE id in (SELECT max(id) FROM test WHERE name LIKE '%somename%')