Did anyone know a way to import easy all the data from the pubchem compound database into an oracle database (11g)?
I didn't find any solution which solves my problem
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I've just been studying DBMS. There are a lot of programs for DB. (eg. Mysql, MariaDB etc..)
So I wonder in program, for example Postgresql, can I change data structure each table?
Most of programs are using B-tree, however I hope change data structure each table if I can.
Are you asking if you can change the table structure like adding or removing columns, altering the data type of a column, if yes, then it is possible.
Refer here for postgresql syntax
Refer here for SQL Server/MS SQL syntax
Refer here for MySQL syntax
I'm gathering information about the database by executing time-based SQL injection attacks (in lab environment). I discovered the current database user and the current database name. But now I don't know the way to get names of the first, the second, the third [,...] tables in that current database. Is there any way can help solve the problem?
I'm working with PostgreSQL, but if you know any way in another DBMS, please tell me, I'm so so grateful!
To list all tables in the current database, you can run the \dt command in psql.
After trying a few different packages and methods found online, I am yet to find a solution that works for inserting a dataframe from R into an existing table in SQL Server.
I've had great success doing this with MySQL, but SQL Server seems to be more difficult.
I have managed to write a new table using the DBI package, but I can't find a way to insert into using this method. Looking at the documentation, there doesn't seem to be a way of inserting.
As there are more than 1000 rows of data, using sqlQuery from the RODBC package also seems unfeasable.
Can anybody suggest a working method for inserting large amounts of data from a dataframe into an existing SQL table?
I've had similar needs using R and PostGreSQL using the r-postgres-specific drivers. I imagine similar issues may exist with SQLServer. The best solution I found was to write to a temporary table in the database using either dbWriteTable or one of the underlying functions to write from a stream to load very large tables (for Postgres, postgresqlCopyInDataframe, for example). The latter usually requires more work in terms of defining and aligning SQL data types and R class types to ensure writing, wheres dbWriteTable tends to be a bit easier. Once written to a temporary table, to then issue an SQL statement to insert into your table as you would within the database environment. Below is an example using high-level DBI library database calls:
dbExecute(conn,"start transaction;")
dbExecute(conn,"drop table if exists myTempTable")
dbWriteTable(conn,"myTempTable",df)
dbExecute(conn,"insert into myRealTable(a,b,c) select a,b,c from myTempTable")
dbExecute(conn,"drop table if exists myTempTable")
dbExecute(conn,"commit;")
I am wondering if someone knows how to export only the table SQL from a db2 database. I want a file that has the SQL to recreate the table without the data in another database environment.
I need this a query. I know db2look has the capability but, I need a query I can run in the database to do this.
Because you don't have privileges to run db2look? You're going to need SELECT privileges on the system catalog tables anyway. And depending on what you try to do, you might also need sysadm, sysctrl, sysmaint, or dbadm.
Metadata is in the SYSIBM schema. The answers here should point you in the right direction.
I would like to copy parts of an Oracle DB to a SQL Server DB. I need to move the data because the Oracle box is being decommissioned. I only need the data for reference purposes so don't need indexes or stored procedures or contstaints, etc. All I need is the data.
I have a link to the Oracle DB in SQL Server. I have tested the following query, which seemed to work just fine:
select
*
into
NewTableName
from
linkedserver.OracleTable
I was wondering if there are any potential issues with using this approach?
Using SSIS (sql integration services) may be a good alternative especially if your table names are the same on both servers. Use the import wizard via and it should create the destination tables for you and let you edit any mappings.
The only issue I see with that is you will need to execute that of course for each and every table you need. Glad you are decommissioning the oracle server :-). Otherwise if you are not concerned with indexes or any of the existing sprocs I don't see any issue in what you are doing.
The "select " approach could be very slow if tables are large. Consider writing pro*C in that case or use Fastreader http://www.wisdomforce.com/products-FastReader.html
A faster and easier approach might be to use the Data Transformation Services, depending on the number of objects you're trying to copy over.