At 12:20 PM 11/21/2007, you wrote:
mos wrote:
Jerry,
Does TRUNCATE work on a merge table?
Apparently not.
I tried:
"truncate table mymergetable" and got:
Error Code : 1
Can't create/write to file '.\dbname\mymergetable.MRG' (Errcode: 17)
I even tried a Flush Tables before the truncate and that didn't help.
So it looks like I'll have to truncate each individual table which is a
pain because the merge table definition may change.
Mike
Since inserts can only go into the first or last table listed in the UNION
option, this appears to be a misuse of merge tables.
Why would you want a bunch of empty and unwritable tables hanging around?
Why would you want them included in the merge table definition?
Gerald,
I have historical data that gets imported into 20 tables, 1
table per year, Table1987 to Table2007 for example. I have a program that
imports the data into each table explicitly, like Table2007. In other words
I don't add data to the merge table but instead I add it to its underlying
tables. For queries I need to select a particular product code for all
years and that's where the merge table comes in handy. I occasionally need
to empty the tables that make up the merge table when I need to re-import
all of the data from an external file. I want to make sure all the tables
are empty before the data is imported.
Mike
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