I am able to create table using psycopg2 library however I am unable to update and delete records in Redshift database. Please suggest some methods to do this.
You can find a lot of good information in their documentation: here
Here's a small snippet for your reference.
with conn.cursor() as sql_cursor:
sql_cursor.execute('delete from table_1 where col1=123')
Also, make sure the db user you are using to update or delete has permission to do so.
Related
could you please tell me if this command could create problems with overwriting all tables in the DB:
df.write.option(“path”, “path_to_the_db/hive/”).mode(overwrite).saveAsTable("result_data")
table_name is a new table in the DB, it hasn't existed.
After these commands, all tables disappeared.
I was using Spark3 and tried to solve an error:
Can not create the managed table('result_data').
The associated location('dbfs:/user/hive/warehouse/result_data') already exists.
I expected that a new table will be created without any issues if it doesn’t exist.
If path_to_the_db/hive contains other tables, then you overwrite into that folder, it seems possible that the whole directory would be emptied first, yes. Perhaps you should instead use path_to_the_db/hive/result_data
According to the error, though, your table does already exist.
You can use Spark to register a temporary table in SQL code, then run INSERT OVERWRITE query for existing tables.
I am learning pl/sql. I want to ask a question for importing excel files.
I create a table after that import data from excel nearly 100 rows.
I wonder how can i see this query basic like;
insert into table_name (column1,colum2,...,columnn )
values (value1, value2, ... , value n); and other 100 rows..
Sincerely
I'm not sure whether there is a feature within Oracle engine itself, but I can think of two ways to get those queries:
1. Use Oracle SQL Developer (Or another GUI with the same features) :
Oracle SQL Developer (Download link here) is a free tool developed by Oracle to interact with the database. Add the connection for your database and connect to it, then follow these guidelines carefully to generate your insert script.
2. Use v$sql (Experimental) :
Right now I have no access to an Oracle database to check this, but theoretically, if the database is a development/training one, there should not be a lot of activities and queries inside, so you can query the v$sql table to find the last 100 (or whatsoever) queries:
SELECT SQL_FULLTEXT FROM V$SQL WHERE ROWNUM < 1000 ORDER BY FIRST_LOAD_TIME desc;
Check for the ones starting with INSERT INTO {THE_TABLE_WHICH_HAS_IMPORTED_DATA} to find your insert lines.
As I mentioned, this method is quite experimental and might confuse you, so I strongly suggest using Oracle SQL Developer.
I am working on a project where i need to perform nested query over Dynamodb tables. Please let know if it is possible if yes then please provide a sample for id not in(select id from table) in node js
Not supported. Select your id`s first and only then use it...
MobileServiceClient's sync tables are doing great. However, I need to maintain a client-located, non-syncing table in the mobile/client app.
My google skills are failing me cos i keep getting the offline-sync table tutorial.
Anyone knows how to maintain a non-syncing table using MobileServiceClient?
Thanks
Same as a Sync table. The differences are:
Your table class does not include the Sync specifier
You don't need to PullAsync() any more since the query is executed against the backend.
Reference here: https://azure.microsoft.com/en-us/documentation/articles/app-service-mobile-dotnet-how-to-use-client-library/#instantiating
I'm using ADO object to connect oracle database. When I execute an INSERT statemnet from VBA it is getting inserted properly. If I check the same record with the current connection, I am able to retrieve the inserted data. But when I check the same directly in Oracle it is not reflecting that inserted Data.
For cross verification, I have created one more button to check whether the Data inserted into the ORACLE table. But there I'm getting only zero recrods.
(I have tried with connection method .BeginTrans and cn.CommitTrans before execute statement)
Can any one of you please let me know the reason.
Regards,
Ram
This sounds like you are missing a COMMIT after your INSERT statement.
This article does a
objADO.CommitTrans
after executing the insert.