If you generate a Target model
. To see the Target model, you can use one of the following methods:
Model > Target Model
.
Target Model
appears.Don't delete the shortcut to the target model, you'll lose the lineage.
An attribute must have a value, whatever that value may be. It must not be NULL.
A data type of an
An
For example, we check for string, length of string, integer, date, etc. In the following figure you can see the supported data types by PowerDesigner.
Image is omitted: Supported data types
Constraints can be violated and there are some actions that can be performed when a violation occurs. The possible actions are: EMPTY COLUMN, NO ACTION and SKIP ROW.
An attribute value constraint is an expression that is evaluated. The person who writes the expression is responsible for the correctness of it. The expression should be formulated in a positive way and lead to a Boolean answer. If the expression validates to True, than the value is correct.
Examples
X > 10
email address LIKE '%_@_%.__%'
A
Every
The main purposes of the
A
Every
An
The main purpose of the
The
The main purpose of the Technical Staging Layer (TSL) is to create a common starting point for further data processing. It receives data delivered from external data sources and temporally stores them in a database. The input data should be in a tabular format (rows and columns).
Bi-temporal
Every
A
The
A
Closed Open means that the timeline is valid from (vanaf in Dutch) the supplied valid start date until - but not including - (tot in Dutch) the supplied valid end date. In practice, this means that the start date of a valid time record is equal to the end date of the previous valid time record.
You need to create
You need to create
The Management Model contains the PowerDesigner objects for the Unified Anchor Modelling (UAM). When a UAM object is created, a so-called PowerDesigner replica of the corresponding Management Model object is created. This means that certain properties such as metadata columns and column stereotypes are configured in the Management Model and cannot be changed. The replication settings specify which elements of an object can be changed after creating a replica from the template object. It is possible to override the replication settings of an UAM object and change a specific property.
The
The main purposes of the
The central facts persistence implementation model is the representation of facts in an anchorized data model with the ability to integrate multiple logical models.
In the
. It is a good practice to capture
An attribute is mandatory when its value can not be empty (NULL).
A Physical Data Model (PDM) represents how data will be implemented in a specific database.
The i-refactory uses four PDMs: technical staging model,central facts model and generic access model. Each one of these models is implemented as an additional database, which is used to store data from external and internal data sources. logical validation model ,
Architecture layer
The core of the i-refactory architecture has four layers: TSTGIN, LVL, CFL and GDAL. There are also two auxiliary layers: UCLVL and EXT.
If an
. The valid start date
If an
. The valid start date
A
A
An
An
A
A
A
A
A
The
The
Computed columns are columns whose content is computed from values in other columns in the table.
The
The
When a certain fact can change over time and you need to capture when that fact is valid in the real world, you can add a valid start date and a valid end date to the entity.
A valid time tells us in which period a record is valid. While a functional date represents just one point in time, the valid time has a begin and an end date, for example:
A
There are two kinds of candidate keys:
A
Normalization is the process of decomposing tables in a database in order to reduce data redundancy and improve data integrity.
A strongly typed model is a model in which each all attributes have a predefined data type, for example: integers, doubles, date.
A
A
A
Every
The
The
An
{example} An order can have different statuses, such as shipped,packing,created anddone. Other statuses are not allowed.
A
A
The
It is good practice to choose a primary key that also meet the following characteristic:
An
Each layer may have one or more
A
A
A
A
oasi_bk is an abbreviation for One
A Customer
can have a Company
and a Person
. They share the common Person
. The Customer
is called a supertype
.
A subtype:
An
A
A
Each
Each
A
A
. A
Each database represents tables internally as <schema_name>.<table_name>
, for example tpc_h.customer
. A tpc_h.customer
and complaints.customer
.
A
An
An
The acronym CRUD stands for create, read, update, and delete. These are the four basic functions of persistent storage.
A
A