speed up join between two databases - mysql

Question

I have this query and takes 40 seconds, Is there a way to speed up? thank you
SELECT *, last.Date
FROM constant.derogation der
LEFT JOIN variable.last last
ON der.code = last.code
WHERE 1 = 1
AND status != 'removed'
ORDER BY status;
+------+-------------+-------+------+---------------+------+---------+------+--------+----------------------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+------+-------------+-------+------+---------------+------+---------+------+--------+----------------------------------------------+
| 1 | SIMPLE | der | ALL | NULL | NULL | NULL | NULL | 318 | Using where; Using temporary; Using filesort |
| 1 | SIMPLE | last | ALL | NULL | NULL | NULL | NULL | 250950 | Using where |
+------+-------------+-------+------+---------------+------+---------+------+--------+----------------------------------------------+
This is the structure of both tables, both databases are on the same server.
I will only get a value from Last Table
DLL
| derogation | CREATE TABLE `derogation` (
`xxx` char(10) NOT NULL,
`xxx` varchar(100) DEFAULT NULL,
`code` char(17) DEFAULT NULL,
`xxx` varchar(20) DEFAULT NULL,
`xxx` char(6) DEFAULT NULL,
`xxx` varchar(50) DEFAULT NULL,
`xxx` varchar(200) DEFAULT NULL,
`xxxx` varchar(200) DEFAULT NULL,
`xxxx` varchar(100) DEFAULT NULL,
`xxxx` datetime DEFAULT NULL,
`xxx` varchar(100) DEFAULT NULL,
`xxxx` varchar(20) DEFAULT NULL,
`xxx` varchar(50) DEFAULT NULL,
`xxx` varchar(10) DEFAULT NULL,
`xxx` datetime DEFAULT NULL,
`xxx` varchar(10) DEFAULT NULL,
`xxx` datetime DEFAULT NULL,
`xxx` datetime DEFAULT NULL,
`status` varchar(20) DEFAULT NULL,
`xxx` varchar(1000) DEFAULT NULL,
KEY `code_index_derogation` (`code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
| Last | CREATE TABLE `Last` (
`code` char(17) DEFAULT NULL,
`xxx` decimal(10,2) DEFAULT NULL,
`Date` datetime DEFAULT NULL,
`xxxx` datetime DEFAULT NULL,
`xxxx` datetime DEFAULT NULL,
`xxxx` text DEFAULT NULL,
`xxxxx` datetime DEFAULT NULL,
`xxxx` char(6) DEFAULT NULL,
KEY `idx_Last_Code` (`code`),
KEY `idx_Last_xxx` (`xxx`),
KEY `code_index` (`code`),
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
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Answer 1

you can use temporary tables, staging tables CTE or you can add indexes for the columns of the tables.
But using temporary tables, it's always an excelent choice to accelerate the excecution of the the SQL query.

Answer 2

(The problem is subtle, and often overlooked in this forum.)
Don't mix collations. You are joining on code, but the CHARACTER SET and COLLATION are different between the two tables. Suggest using `ALTER TABLE .. CONVERT TO .. to get them to be the same.
Other tips:
Use CHAR only for truly fixed-length columns. Use VARCHAR otherwise.
Have a PRIMARY KEY on every table.
Don't say LEFT JOIN if you really expect JOIN; it adds confusion to the reader.