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I need to update multiple columns (~250) from one table to another based on
a two-column key. In Postgres I would write this using the FROM clause, but
since MonetDB doesn't support the FROM clause, I've successfully updated
one column with:
UPDATE census.acs2010_5yr
SET b07401001 = (
SELECT CAST(b07401001 AS int)
FROM acs2010_5yr.tmp_seq0001
WHERE acs2010_5yr.stusab = tmp_seq0001.stusab AND acs2010_5yr.logrecno =
tmp_seq0001.logrecno
);
My question is whether there is any benefit to writing …
[View More]a multiple column
update into a single UPDATE statement:
UPDATE target_table
SET column1 = (SELECT column1 FROM source_table WHERE target_table.key =
source_table.key),
column2 = (SELECT column2 FROM source_table WHERE target_table.key =
source_table.key),
...,
columnN = (SELECT columnN FROM source_table WHERE target_table.key =
source_table.key);
On Postgres I believe the multi-column update using a table join would only
have to do the sequential scan of each table once, but with the necessity
of sub-selects in MonetDB, what is the backend doing? Is it already doing
an index scan once for each row in the single column case, then doing it
once for each row * column in the multi-column case?
Best,
--Lee
--
Lee Hachadoorian
Asst Professor of Geography, Dartmouth College
http://freecity.commons.gc.cuny.edu/
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Hello all,
I was wondering if there is any documentation about the API
for XQuery (i.e., how to write xqueries from a Java
program).
Also, I am interested in using some features of XLink and
XUpdate on top of my XML database. Is support for any of
these in progress?
Thanks in advance,
Alexandra
______________________________________________________
Click here to donate to the Hurricane Katrina relief effort.
http://store.yahoo.com/redcross-donate3/
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