Creation of Schema in Oracle after checking

Question

All,
My sincere apologies to post this here, but I did not find the answer anywhere.
I have a task to convert some SQL Server Scripts to Oracle.
The below is the sql server script to create the schema called HRMS after checking whether it is existing or not.
IF NOT EXISTS (SELECT [schema_id] FROM [sys].[schemas] WHERE [name] = N'HRMS')
BEGIN
EXECUTE ('CREATE SCHEMA [HRMS] AUTHORIZATION [dbo];');
END
GO
Can we have any similar kind of solution / statement in oracle. Please help me.
When I read in the Oracle Docs, CREATE SCHEMA statement is just to bundle multiple sql statements to a single transaction.
http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_6014.htm
2)
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[HRMS].[TBL_PMapping]') AND type in (N'U'))
DROP TABLE [HRMS].[TBL_PMapping]
GO
This statement is to check whether the table called 'TBL_PMapping is exists or not and, if exists then drop it. Please suggest me a similar approach/ how to achieve the same with in Oracle.
First need to check whether the table exists or not, if exists then drop it other wise create it.
I would request for your kind help in this. Thank you very much in advance.
Thanks,

Answer 1

968217 wrote:
All,
My sincere apologies to post this here, but I did not find the answer anywhere.
I have a task to convert some SQL Server Scripts to Oracle.
The below is the sql server script to create the schema called HRMS after checking whether it is existing or not.
IF NOT EXISTS (SELECT [schema_id] FROM [sys].[schemas] WHERE [name] = N'HRMS')
BEGIN
EXECUTE ('CREATE SCHEMA [HRMS] AUTHORIZATION [dbo];');
END
GO
Can we have any similar kind of solution / statement in oracle. Please help me.
When I read in the Oracle Docs, CREATE SCHEMA statement is just to bundle multiple sql statements to a single transaction.
http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_6014.htm
2)
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[HRMS].[TBL_PMapping]') AND type in (N'U'))
DROP TABLE [HRMS].[TBL_PMapping]
GO
This statement is to check whether the table called 'TBL_PMapping is exists or not and, if exists then drop it. Please suggest me a similar approach/ how to achieve the same with in Oracle.
First need to check whether the table exists or not, if exists then drop it other wise create it.Oracle is NOT SQL Server, and doesn't work like SQL Server. It may be acceptable in SQL Server to drop and create tables on-the-fly, but in Oracle it's considered poor database design. There shouldn't be any need to drop and recreate tables at run time, and it would likely drop dependencies from other database objects or triggers, constraints, indexes, grants etc.
If you need a "temporary table" in Oracle, you create a Global Temporary Table just once and use it for your session. This is a special kind of table where the data in it is only visible to the session that inserts it (multiple sessions only see their own data), and that data is automatically removed upon commit or when the session ends, depending on how you configure the table at the time of creation.