sql-delete

问题 I'm using the following SQL to identify duplicates in the table 'transaction_list'. This works perfectly. Now I want to delete all duplicates from that table based on these criteria and leave only the latest entries. These can be identified by the column 'last_update'. I tried different DELETE statements but it didn't work. Any suggestions are highly appreciated. SELECT par_num ,tran_num ,COUNT(*) AS num_duplicates FROM transaction_list WHERE last_update >= to_date('01-mar-2020 00:00:00', 'dd

问题 I'm trying to delete from two tables which have a relationship using ORDER BY DESC and LIMIT. DELETE FROM my_rel_table AS t1 LEFT JOIN my_photo_table AS t2 ON t2.typeid = t1.typeid WHERE t1.relid = 1 AND t1.type = 1 ORDER BY t1.id DESC LIMIT 1 Obviously the above does not work since mysql does not accept the order by and limit using an inner join. Table structure is as follows: my_rel_table id relid relno typeid type int int int int tinyint my_photo_table typeid pos_x pos_y width height int

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question Entity Framework can be very slow on mass insert/update/delete operations. Even the often suggested tweaks to turn off AutoDetectChanges and/or ValidateOnSaveEnabled does not always help. I have come across the Z.EntityFramework.Extensions on NuGet, but it seems

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question Entity Framework can be very slow on mass insert/update/delete operations. Even the often suggested tweaks to turn off AutoDetectChanges and/or ValidateOnSaveEnabled does not always help. I have come across the Z.EntityFramework.Extensions on NuGet, but it seems

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Improve this question Entity Framework can be very slow on mass insert/update/delete operations. Even the often suggested tweaks to turn off AutoDetectChanges and/or ValidateOnSaveEnabled does not always help. I have come across the Z.EntityFramework.Extensions on NuGet, but it seems

问题 My innodb table has the following structure: 4 columns (CountryID, Year, %Change, Source) , with the 2 columns (CountryID, Year) as the primary key. How do I delete multiple rows other than using a for-loop to delete each row? I'm looking for something similar to DELETE FROM CPI WHERE CountryID AND Year IN (('AD', 2010), ('AF', 2009), ('AG', 1992)) 回答1: The answer in Oracle is: delete from cpi where (countryid, year) in (('AD', 2010), ('AF', 2009), ('AG', 1992)) It's fairly standard SQL

问题 My innodb table has the following structure: 4 columns (CountryID, Year, %Change, Source) , with the 2 columns (CountryID, Year) as the primary key. How do I delete multiple rows other than using a for-loop to delete each row? I'm looking for something similar to DELETE FROM CPI WHERE CountryID AND Year IN (('AD', 2010), ('AF', 2009), ('AG', 1992)) 回答1: The answer in Oracle is: delete from cpi where (countryid, year) in (('AD', 2010), ('AF', 2009), ('AG', 1992)) It's fairly standard SQL

来源： https://stackoverflow.com/questions/64242895/sqlite-wrong-id-when-i-create-a-new-item-after-an-elimination

来源： https://stackoverflow.com/questions/64242895/sqlite-wrong-id-when-i-create-a-new-item-after-an-elimination

来源： https://stackoverflow.com/questions/64499270/how-to-do-an-update-delete-and-select-using-stored-procedure