Postgresql Return pre UPDATE column values using SQL only Stack
77 I posted a related ion but this is another part of my puzzle I would like to get the OLD value of a column from a row that was UPDATEd WITHOUT using triggers nor stored procedures nor any other extra non SQL query entities I have a query like this
Postgres update a row on conflict insert and return old values, Postgres update a row on conflict insert and return old values Asked 4 years 9 months ago Modified 4 years 9 months ago Viewed 5k times 4 I need a query to update a row in table but if the id doesn t exist it inserts default values Also it has to avoid threads race conditions
PostgreSQL Documentation 16 UPDATE
The optional RETURNING clause causes UPDATE to compute and return value s based on each row actually updated Any expression using the table s columns and or columns of other tables mentioned in FROM can be computed The new post update values of the table s columns are used
How to return the old value of a column in a postgres INSERT ON , 2 Answers Sorted by 6 Another possible answer if you are willing to update the schema would be to store the previous value in another column
Sql Is it possible how to return old value from after update
Sql Is it possible how to return old value from after update , 4 This ion already has answers here Return pre UPDATE column values using SQL only 4 answers Closed 8 years ago UPDATE Users SET displayName new name WHERE id 1 RETURNING displayName Query above returns NEW value I want to know OLD value of displayName after update I know that it possible to UPDATE FROM SELECT
Postgresql Postgres Generated Columns Returning 0 For Each Record
Postgresql RETURNING value from SELECT table in INSERT SELECT
Postgresql RETURNING value from SELECT table in INSERT SELECT Tour Start here for a quick overview of the site Help Center Detailed answers to any ions you might have Meta Discuss the workings and policies of this site
SQL Cannot SELECT From UPDATE RETURNING Clause In Postgres YouTube
1 Answer Sorted by 1 You can use the window function inside a CTE for example WITH new values AS FROM myid lagged FROM SELECT LAG myval OVER ORDER BY myid lagged FROM mytable foo WHERE myval 0 UPDATE mytable l SET myval lagged FROM new values n WHERE l myid n myid RETURNING Share Improve this answer Follow Postgresql UPDATE column with previous value Database . In the mentioned example the SELECT has to retrieve the whole row just inserted so an INSERT RETURNING is more appropriate In general it s not possible in a WITH construct to read up to date values for the rows that another part of the query writes into This is documented in WITH Queries Common Table Expressions The sub statements in WITH are executed concurrently with each other CREATE OR REPLACE FUNCTION update totals RETURNS void AS UPDATE orders SET total fees SELECT SUM fees FROM order items WHERE order id OLD order id total profit CASE WHEN total cost IS NOT NULL THEN total total tax total cost SELECT SUM fees FROM order items WHERE order id OLD order id ELSE NULL END WHERE id O
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