this might sound like a trivial question but i've looked everywhere. I have a table like this:
id var1
1
2 19353
there is no entry for var1 where id =1 and I want to copy the entry for var1 from the other row to that location so that i have
id var1
1 19353
2 19353
i've tried but was unsuccessful with:
update table set var1 = (select var1 from table where id=2) where id=1;
any advice? thanks!
MySQL seems to have its own ideas about the syntax for multi-table update (a/k/a UPDATE FROM
). Looks like the following is required. Except, I don't have MySQL to test on.
UPDATE t AS t1, t AS t2
SET t1.var1 = t2.var1
WHERE t1.id=1 AND t2.id=2;
EDIT: I have changed table name to t
; we don't want a reserved word there.
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