I've been working on deleting all the rows in Azure table in java. Can I do it without querying it?
Thanks in advance
If I retrieve all the data, can I perform delete query on that?
If you just want to delete data, you just need to retrieve PKs and RKs. After retrieved all the data of PKs and RKs, you could perform the delete query for the entities one by one.
For complex delete query, for example, below query is not supported currently.
delete from tablename where PK = ''
I suggest you submit your idea on Azure feedback site which is used for features request.
https://feedback.azure.com/forums/217298-storage
If you don't want to query the table, what you can do is to delete the table and recreate it.
Related
For a project i need to to delete all data from all tables in a database,
I tried
DELETE FROM table1,table2,table3,...;
But it doesnt work. Any advice ? Thank
I would like to refer You to this related post
How do I use cascade delete with SQL Server?
as You will find there several possible solutions.
When using SQL it means that Your data is relations, which means most of the records are somehow related in the different tables and this relation is expressed with foreign keys. However when attempting to delete data which is id is related with data in another table a cascade deletion should be implemented, the other way around it is add additional boolean column named isDeleted(as example ofcourse) and just alter specific rows to true in this specific column and then filter by preferences. Hopefully I have managed somehow to provide with alternative and/or possible solution to Your problem.
Leaving also this link which gives some examples on cascade deletion and guide on how to implement it. ->
https://www.sqlshack.com/delete-cascade-and-update-cascade-in-sql-server-foreign-key/
P.S. also if You want just to DELETE all the data You can either use TRUNCATE TABLE or DROP DATABASE query. With the latest option You will have to recreate the database once more.
Because you want to delete all databases from all tables, you are essentially deleting the database.
The sqlite way of doing this is to just delete the database file.
In contrast to postgres or mongodb or most databases, sqlite doesn't have a server so no need to call DROP DATABASE.
As soon as the file is gone and you open the database from your application you will be in a blank state again.
I would like to delete on record from impala table. Below I have used to delete the record from the table.
This is My Query :
DELETE FROM sample.employee_details WHERE sno=5 AND name='XYZ'AND age=26;
suggest the best way to remove a record from the table.
This is fine assuming your where conditions uniquely identify the row. See the documentation:
https://www.cloudera.com/documentation/enterprise/5-10-x/topics/impala_delete.html
Impala delete command works only for Kudu storage type. Any storage formats other than kudu are not designed for online transactions and does not offer any real-time queries and row level updates and deletes.
I am using Room Database over SQlite and Live Data in my android application. I need to delete whole table data not database so I am going to delete table in separate Query like:
DELETE From Table_name
But I want to delete multiple tables data not drop in single Query not all tables. So please give me an appropriate solution.
I am creating this SSIS import package for about 10 tables , I am still new to this so I really appreciate any help I can get.
I need to compare my Excel source to this ~10 tables to see if any record exists ,if it exists then update it or else insert it. I am struggling on how to check on various tables where they all have auto-incremented PK. If one record doesn't exist how can I insert it and make sure the other tables have the foreign keys(auto-incremented primary key of tables) updated as well.Meaning the relationship of each record that have been divided into so many tables are tact.
My plan for the package:
Excel source
Look up transformer
Data conversion transformer
derived column transformer
multicast
OLE DB destination
Please advise on how I should go about, and the order I should follow for my transformers.
hmm ok firstly get the excel source into an sql staging table first (truncate before loading) then you could consider using the sql merge statement via an execute sql task to merge the data into the end tables. This will allow you to insert if the record dosent exist. You may need to lookup the foreign keys before running the merge. Are you able to post details of the 10 tables and import csv?
I have an Access front end for a SQL database. I can add, update and delete records directly in the tables from Access. I can also update and delete rows from queries based on those tables. However, I am unable to add records to any queries. They can be simple queries based on one table with no criteria, it doesn't matter. I am unable to add rows.
I am the db owner, by the way, so permissions should not be a problem. Also, like I said, I can add directly to the tables, just not through queries.
Have any of you experienced this behavior?
Thank you for any help you can provide!