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Primary Key Generation Using Oracle's Sequence
- Apr 27, 2006 Re: Creating a Primary Key using VBA Hi Norie I have only got as far as creating the new table, which has no primary key, by running a Public Function called by each of the sub Functions creating the Master tables which mainly consists of a couple of SQL statements.
- How do I set a Primary Key in Excel How do I set a primary key in Microsoft Excel because what I have to do is to import whatever data in Excel into Micr. I'll cover the following topics in the code samples below: Microsoft SQL Server Management StudioSQL Server, Microsoft Excel, Worksheet, VBA, and CreateField.
- Hello Excellers and welcome back to another #formulafriday #exceltip in my 2019 Excel tip series. Today I want to share with you a question I was asked by a subscriber. They need to generate unique ID numbers or references, from their data.
- Nov 27, 2013 I need expert help to create and insert a primary table key called 'ID' after I have deleted all existing records from an access table called 'inspectiondata', and then copied all the records from an excel file and pasted them into the same table.
Nov 21, 2017 Firstly, you can define a primary key concatenate their name and surname and secondly, you need two create a table between them with the unique values of each employee. In that way, you will have a many (sales table) to one (employee table) relationship and a one (employee table) to many (wages table) relationship and PowerBI will work perfectly.
Oracle provides the
sequence
utility to automatically generate unique primary keys. To use this utility to auto-generate primary keys for a CMP entity bean, you must create a sequence table and use the @AutomaticKeyGeneration annotation to point to this table.In your Oracle database, you must create a sequence table that will create the primary keys, as shown in the following example:
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This creates a sequences of primary key values, starting with 1, followed by 2, 3, and so forth. The sequence table in the example uses the default increment 1, but you can change this by specifying the increment keyword, such as increment by 3. When you do the latter, you must specify the exact same value in the cacheSize attribute of the @AutomaticKeyGeneration annotation:
If you have specified automatic table creation in the CMP bean's project settings, the sequence table will be created automatically when the entity bean is deployed. For more information, see @JarSettings Annotation. For more information on the definition of a CMP entity bean, see below.
Primary Key Generation Using SQL Server's IDENTITY
In SQL Server you can use the
IDENTITY
keyword to indicate that a primary-key needs to be auto-generated. The following example shows a common scenario where the first primary key value is 1, and the increment is 1:In the CMP entity bean definition you need to specify SQLServer(2000) as the type of automatic key generator you are using. You can also provide a cache size:
If you have specified automatic table creation in the CMP bean's project settings, the sequence table will be created automatically when the entity bean is deployed. For more information, see @JarSettings Annotation. For more information on the definition of a CMP entity bean, see below.
Primary Key Generation Using a Named Sequence Table
A named sequence table is similar to the Oracle sequence functionality in that a dedicated table is used to generate primary keys. However, the named sequence table approach is vendor-neutral. To auto-generate primary keys this way, create a named sequence table using the two SQL statements shown in the example:
In the CMP entity bean definition you need to specify the named sequence table as the type of automatic key generator you are using. You can also provide a cache size:
If you have specified automatic table creation in the CMP bean's project settings, the sequence table will be created automatically when the entity bean is deployed. For more information, see @JarSettings Annotation. For more information on the definition of a CMP entity bean, see the next section.
Note. When you specify a cacheSize Linux generate ssh public key authentication. value for a named sequence table, a series of unique values are reserved for entity bean creation. When a new cache is necessary, a second series of unique values is reserved, under the assumption that the first series of unique values was entirely used. This guarantees that primary key values are always unique, although it leaves open the possibility that primary key values are not necessarily sequential. For instance, when the first series of values is 10..20, the second series of values is 21-30, even if not all values in the first series were actually used to create entity beans.
Defining the CMP Entity Bean
When defining a CMP entity bean that uses one of the primary key generators, you use the the @AutomaticKeyGeneration annotation to point to the name of the primary key generator table to obtain primary keys. Also, you must define a primary key field of type Integer or Long to set and get the auto-generated primary key. However, the ejbCreate method does not take a primary key value as an argument. Instead the EJB container adds the correct primary key to the entity bean record.
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The following example shows what the entity bean might look like. Notice that the bean uses the named sequence option described above, and thatejbCreate method does not take a primary key:
Generate Primary Key In Excel File
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