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EnterpriseDB: Create Table As (CTAS) Wizard
Oracle Tips by Burleson
 

The create table as, also known as CTAS, wizard (Figure 5.25) allows you to create tables from existing tables via a query.  The tables created maintain any column level constraints but do not inherit any table level constraints.  This is because you can combine multiple tables in a single statement. 

Figure 5.25: Create Table As Query Wizard

The table name and query are both required parameters.  You may load the query with a SQL statement from a file by clicking the Import From File button.  You may also save the query to file by using the Export To File button.

You may use any valid SQL statement, including joins, in the SQL query.

You may also include an optional list of column names.  I find it easiest to allow the query to define the column names.

Create View Wizard

A view is a stored query.  The create view wizard (Figure 5.26) looks much like the CTAS wizard.  Instead of instantiating a table with data, the query is stored and is instantiated at run time.

Figure 5.26: Create View Wizard

The view name and query are both required parameters.  You may load the query with a SQL statement from a file by clicking the Import From File button.  You may also save the query to file by using the Export To File button.

You may use any valid SQL statement, including joins, in the SQL query.

Create Packages/Procedures/Functions/Triggers

The wizard to create stored code is actually the SQL Interactive window with a code template pre-loaded.  I will cover coding below in the section on SQL & SPL development.

Create Sequence Wizard

A sequence is an incremental number generator.  The create sequence wizard (Figure 5.27) creates a sequence.

Figure 5.27: Create Sequence Wizard

The only mandatory parameter when creating a sequence is the sequence name, which must follow object naming standards.

The optional (defaulted) parameters are:

* You can choose whether the number will be incremented (+) or decremented (-).

* Increment – The increment is the number that will be added to or subtracted from during each call to nextval. 

* MinValue – The MinValue is the lowest a decrement sequence will go before giving an error or cycling (if cycle is selected)

* MaxValue – The MaxValue is the highest an increment sequence will go before giving an error or cycling (if cycle is selected)

* Start – The number to start with on the next call to nextval

* Cache – The number to cache in memory for each session.  Useful for improving performance

* Cycle – Should this sequence start over upon hitting the MinValue or MaxValue (depending in increment or decrement)?

        
     

This is an excerpt from the book "EnterpriseDB: The Definitive Reference" by Rampant TechPress.

  
 

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