如何从另一个表更新MYSQL中的一个表？ 具有额外的价值

Question

I have two tables that are similar.

Table word
column names: id, name, describe
1 bob Is a cat
2 Sam Not a giraffe
3 Gub Like a cat

Table temp
column names: id, name, describe
1 bob Is a cat
2 Sam Not a giraffe
3 Gub Like a cat
4 Col The other one

I am currently using this to update table word from table temp, but the 4th value isn't being added. How would I do that?

UPDATE temp p, word pp
SET pp.name= p.name, pp.describe = p.describe
WHERE pp.id = p.id;

Answer 1

Try this :: INSERT ON DUPLICATE KEY UPDATE

INSERT INTO word(id, name, describe) SELECT id, name, describe FROM temp 
ON DUPLICATE KEY UPDATE SET word.name = temp.name, word.describe = temp.describe;

Answer 2

If I understand correctly, you want to copy values from one table to another, keeping the same id . In this case, you can't put condition WHERE pp.id = p.id. This way, it would only copy rows with id that already exist in 'word' table, skipping any unique rows. You can use "INSERT INTO...ON DUPLICATE KEY UPDATE" to get arround it. http://dev.mysql.com/doc/refman/5.1/en/insert-on-duplicate.html

Answer 3

the last one would need an insert statement because it does not exist yet

INSERT INTO word pp SELECT * FROM temp left join word on on temp.id = word.id where temp.id IS NULL