I tried this solution, but ran into following problem. The temp_table has columns (col1, col2, col3). The original_table has columns (col0, col1, col2, col3) Now the extra col0 on the original_table is the unique generated ID by the database. How can I make your suggestions work in that case .. ? On Wednesday 22 March 2006 11:09 am, Jim C. Nasby wrote: > Load the files into a temp table and go from there... > > COPY ... FROM file; > UPDATE existing_table SET ... WHERE ...; > INSERT INTO existing_table SELECT * FROM temp_table WHERE NOT EXISTS( > SELECT * FROM existing_table WHERE ...) > > On Wed, Mar 22, 2006 at 10:32:10AM -0500, ashah wrote: > > I have a database with foreign keys enabled on the schema. I receive > > different files, some of them are huge. And I need to load these files in > > the database every night. There are several scenerios that I want to > > design an optimal solution for - > > > > 1. One of the file has around 80K records and I have to delete everything > > from the table and load this file. The provider never provides a "delta > > file" so I dont have a way to identify which records are already present > > and which are new. If I dont delete everything and insert fresh, I have > > to make around 80K selects to decide if the records exist or not. Now > > there are lot of tables that have foreign keys linked with this table so > > unless I disable the foreign keys, I cannot really delete anything from > > this table. What would be a good practise here? > > > > 2. Another file that I receive has around 150K records that I need to > > load in the database. Now one of the fields is logically a "foreign key" > > to another table, and it is linked to the parent table via a database > > generated unique ID instead of the actual value. But the file comes with > > the actual value. So once again, I have to either drop the foreign key, > > or make 150K selects to determine the serial ID so that the foreign key > > is satisfied. What would be a good strategy in this scenerio ? > > > > Please pardon my inexperience with database ! > > > > Thanks, > > Amit > > > > ---------------------------(end of broadcast)--------------------------- > > TIP 4: Have you searched our list archives? > > > > http://archives.postgresql.org
