DELETE RETURNING clause in PostgreSQL LearnSQL
The standard DELETE statement in SQL returns the number of deleted rows DELETE FROM external data DELETE 10 In PostgreSQL you can make DELETE statement return something else You can return all rows that have been deleted You can return the columns of your choice
Postgresql How to select number of affected rows to variable in , Hmm as far as I know rows may change between select count and update because rows are not locked in this transaction So even if count will return 10 there is no guarantee that exactly 10 rows will be updated It would require to select for update but then I would have to make 3 queries because for update does not work with aggregate function afaik
Postgresql get row count of last select query Database
Is there a PostgreSQL function to get the number of rows the last query had If that would be the case I could cut down DB load quite a load and shorten the export time I have looked into ROW COUNT but it only seems to be valid for UPDATE INSERT and not SELECT I d also like to avoid using functions for simpli reasons
Postgresql What is the most efficient way to count the number of rows , Select count from image The primary key on this table is non incrementing it s a unique serial number for the images stored in the table Our app often attempts to ingest images that have already been recorded in the database so the primary key serial number ensures they are only recorded once
PostgreSQL Documentation 16 DELETE
PostgreSQL Documentation 16 DELETE, DELETE deletes rows that satisfy the WHERE clause from the specified table If the WHERE clause is absent the effect is to delete all rows in the table The result is a valid but empty table Tip TRUNCATE provides a faster mechanism to remove all rows from a table
Learn Coding Commands Top PostgreSQL Commands You Must Know
Get the count of affected rows with ease The power of the RETURNING
Get the count of affected rows with ease The power of the RETURNING Postgres s RETURNING clause makes it possible to retrieve both the data of the impacted rows and the total number of rows that were modified or deleted The RETURNING clause is used to get certain columns from a database It is appended at the end of a query
PostgreSQL Vs MySQL Differences In Syntax A Developer Guide
The following statement illustrates various ways of using the COUNT function COUNT The COUNT function returns the number of rows returned by a SELECT statement including NULL and duplicates SELECT COUNT FROM table name WHERE condition Code language SQL Structured Query Language sql PostgreSQL COUNT Function PostgreSQL Tutorial. 67 8k 13 164 150 Add a comment 3 Answers Sorted by 14 For a very robust solution that is part of PostgreSQL SQL and not just plpgsql you could also do the following with a as DELETE FROM feeds item WHERE shareurl re1 returning 1 select count from a You can actually get lots more information such as In a DELETE the data available to RETURNING is the content of the deleted row For example DELETE FROM products WHERE obsoletion date today RETURNING If there are triggers Chapter 39 on the target table the data available to RETURNING is the row as modified by the triggers
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