Tagged Questions
2
votes
0answers
45 views
update statement with self join
I needed to copy information from one row of a table to another.
I noticed I could do the following:
update address
set col1 = a2.col1,
col2 = a2.col2,
.....etc
from address a1, address a2
where ...
3
votes
1answer
86 views
Oracle: Non key-preserved table should be
I'm getting "ORA-01779: cannot modify a column which maps to a non key-preserved table" when I try to update a join. I've searched around the site and found a lot of advice on what key-preserved ...
0
votes
0answers
111 views
Which update is faster using join or sequential?
My this question is in sequence of my previous question I asked.
I could write two solutions using Stored Procedure instead of trigger or nested-query .
Both use a helper function ...
2
votes
1answer
116 views
Update ranking on table
I have two tables:
mysql> desc rank ;
+----------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
...
