This query will run quite slow if tables are large, so - you may in addition
create a trigger-updated TIMESTAMP columns and search for changed data
through the recent created/updated elements only.
On 13 May 2007 02:21:30 -0700, [EMAIL PROTECTED] <[EMAIL PROTECTED]>
wrote:
On May 11, 11:06 pm, "L. Berger" <[EMAIL PROTECTED]> wrote:
> Hello
>
> I havetwotables-- A and B. The structure of both is thesame. Only,
> B has many indexes and is used for heavy duty SELECTs. On theother
> hand, A only accepts heavy duty INSERTs, so has onlyoneprimary key
> index.
>
> So my DB design is such that A is only an INSERT table. Periodically,
> say every 20 minutes or so, I would like to take all the new INSERTs
> from table A and put them into B.
>
> Is there any clever command to accomplish this? I'd rather not write a
> PHP script with SQL to take every single new record, and update every
> column of a new row in table B. For instance, can I do a replication
> of onlytables, not databases?
>
> Thanks for any pointers!!
>
> LB
Assuming ID is PK:
INSERT INTO b
SELECT *
FROM a
WHERE NOT EXISTS (
SELECT 1
FROM b
WHERE b.ID = a.ID
)
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
