tag:blogger.com,1999:blog-426922399870577072.post9026934688258366105..comments2024-03-28T08:13:24.785-04:00Comments on The Database Programmer: Approaches to "UPSERT"KenDownshttp://www.blogger.com/profile/11117175783163937575noreply@blogger.comBlogger34125tag:blogger.com,1999:blog-426922399870577072.post-18929284980689882932023-12-26T13:25:22.383-05:002023-12-26T13:25:22.383-05:00Good information.Good information.python ai programminghttps://factored.ai/python-programming-language-ai/noreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-35095983391761234432022-02-10T22:18:09.055-05:002022-02-10T22:18:09.055-05:00바카라사이트
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It is still relevant today (a year and a half later!) since UPSERT is still on the PostgreSQL Todo list.<br /><br />For those using Python, check out the generic <a href="http://dound.com/2011/01/postgresql-upsert-in-python/" rel="nofollow">PostgreSQL UPSERT</a> method I wrote. I find it more convenient than writing a trigger like Ken's for every table.David Underhillhttp://www.dound.comnoreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-19307358473850838972010-11-06T10:52:06.830-04:002010-11-06T10:52:06.830-04:00Anonymous: Thanks for the compliment, this morning...Anonymous: Thanks for the compliment, this morning I'm doing my first post after about 18 months.KenDownshttps://www.blogger.com/profile/11117175783163937575noreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-77550504729410644612010-08-23T17:07:06.715-04:002010-08-23T17:07:06.715-04:00Wherefore art thou, Ken? We're dying for more ...Wherefore art thou, Ken? We're dying for more content!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-48701196174750391662010-03-05T05:59:47.325-05:002010-03-05T05:59:47.325-05:00Anonymous: your comment and approach illustrate a ...Anonymous: your comment and approach illustrate a basic reality of databases and programming: rules of thumb are great, but the particulars of the situation have final say.<br /><br />In the blog I try to provide examples and techniques, but that never means a particular technique is the *only* way, there are always other ways to do it.KenDownshttps://www.blogger.com/profile/11117175783163937575noreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-5773532762832517672010-02-18T16:27:34.144-05:002010-02-18T16:27:34.144-05:00I do an Update, Delete, Insert. This is necessary...I do an Update, Delete, Insert. This is necessary because we use staging tables of tens of thousands of rows. So you have to do something like this.<br /><br />-- Update existing rows<br />UPDATE Dest<br />SET Col1 = s.Col1,<br /> Col2 = s.Col2<br />FROM Dest d INNER JOIN Source s<br />ON d.id = s.d_id<br /><br />-- Delete existing rows from the<br />-- source table<br />DELETE FROM Source<br />FROM Source s INNER JOIN Dest d<br />ON d.id = s.d_id<br /><br />-- Insert the remaining.<br />INSERT INTO Dest (Col1, Col2)<br />SELECT Col1, Col2<br />FROM SourceAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-16978697923266911152009-09-19T17:44:55.383-04:002009-09-19T17:44:55.383-04:00@Michael The Postgres developers have agreed in pr...@Michael The Postgres developers have agreed in principal to support merge, there is even a mapped out syntax and many details of the implementation have been discussed; all that is need now is for some ambitious C coder to show up and start working on a patch. Know anyone? You can find the details on the Postgres TODO list, just scroll down to "Add SQL-standard MERGE/REPLACE/UPSERT command"Robert Treathttp://www.xzilla.net/noreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-61413376543710990322009-07-25T04:16:31.360-04:002009-07-25T04:16:31.360-04:00Oracle also supports the MERGE command already for...Oracle also supports the MERGE command already for a long time.<br /><br />PatrickPatrick Wolfhttps://www.blogger.com/profile/16652802762749621200noreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-59873707039683704742009-07-22T10:43:04.238-04:002009-07-22T10:43:04.238-04:00Not to bash MySQL, but its syntax is at least stra...Not to bash MySQL, but its syntax is at least strange since you have to repeat the values two times. The proof that it's prone to errors is the mistake in the first example in the article:<br /><br />insert into table (a,c,b) values (1,2,3)<br /> on duplicate key update<br /> b = 2,<br /> c = 3<br /><br />It will insert value 2 to <b>c</b> and 3 to b, but it will update <b>b</b> to 2 and c to 3....pgeonoreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-33336279370723999002009-07-10T10:05:07.010-04:002009-07-10T10:05:07.010-04:00@antimatroid- your example works if there is only ...@antimatroid- your example works if there is only a single row being inserted or if all the rows need to be either inserted or updated. If there are a mix of inserts and updates (which there might be if you are doing an INSERT INTO... SELECT... FROM), you will only update the existing and skip the inserts. There is still a way to avoid the cursor though using an inner and a left join:<br />UPDATE orderlines<br />SET qty = inserted.qty<br />FROM inserted<br />INNER JOIN orderlines ON orderlines.order_id = inserted.order_id<br />AND orderlines.sku = inserted.sku;<br /><br />INSERT INTO orderlines (order_id,sku,qty)<br />SELECT order_id, sku, qty<br />FROM inserted<br />LEFT JOIN orderlines ON orderlines.order_id = inserted.order_id<br />AND orderlines.sku = inserted.sku;<br />where orderlines.order_id IS NULL<br /> and orderlines.sku IS NULLChad Crawfordnoreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-44131653724329935032009-07-09T18:08:57.282-04:002009-07-09T18:08:57.282-04:00There is also the non-standard REPLACE in MySQL, t...There is also the non-standard REPLACE in MySQL, that works like an INSERT but deletes the conflicting row before inserting the new one.<br /><br />http://dev.mysql.com/doc/refman/5.0/es/replace.htmlEl Hombre Grishttps://www.blogger.com/profile/17724942188556553683noreply@blogger.comtag:blogger.com,1999:blog-426922399870577072.post-18259904962457867082009-06-30T14:09:00.924-04:002009-06-30T14:09:00.924-04:00SQLite has the equally useful 'insert or repla...SQLite has the equally useful 'insert or replace' statement (see http://www.sqlite.org/lang_insert.html for details)--DDhttps://www.blogger.com/profile/03097117701435249366noreply@blogger.com