1. Surrogate Key Generates Non-numeric Values In Excel
2. Sql Replace Non Numeric Values
3. Surrogate Key Generates Non-numeric Values Definition
4. Surrogate Key Generates Non-numeric Values List

Apr 20, 2006  The first problem is inherently caused by inserting meaningless data, and is always a problem, even with the built-in surrogate keys where the RDBMS provides a mechanism to retrieve the value. Sequences: a better surrogate key. Surrogate keys are often considered very bad practice, for a variety of good reasons I won’t discuss here. The added key column is known as a surrogate key. The surrogate key in the target replaces the primary key that is loaded into the target from the source. The surrogate key is required because the target contains multiple instances of the primary key in the source. A surrogate key is a unique primary key that is not derived from the data that it represents, therefore changes to the data will not change the primary key. In a star schema database, surrogate keys are used to join a fact table to a dimension table. The Surrogate Key Generator stage can have a single input link. The values of generated surrogate keys have no relationship to the real-world meaning of the data held in a row. When inspecting a row holding a foreign key reference to another table using a surrogate key, the meaning of the surrogate key's row cannot be discerned from the key itself. Every foreign key must be joined to see the related data item.

Primary Key. A primary key is used to uniquely identify a record/row in a database table. It does not accept NULL values. It is clustered index by default which means data is organized in the clustered index sequence.

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Use the surrogate key transformation to add an incrementing key value to each row of data. This is useful when designing dimension tables in a star schema analytical data model. In a star schema, each member in your dimension tables requires a unique key that is a non-business key.

Configuration

Key column: The name of the generated surrogate key column.

Start value: The lowest key value that will be generated.

Increment keys from existing sources

To start your sequence from a value that exists in a source, use a derived column transformation following your surrogate key transformation to add the two values together:

Increment from existing maximum value

Surrogate Key Generates Non-numeric Values In Excel

To seed the key value with the previous max, there are two techniques that you can use based on where your source data is.

Database sources

Use a SQL query option to select MAX() from your source. For example, Select MAX(<surrogateKeyName>) as maxval from <sourceTable>/

File sources

If your previous max value is in a file, use the max() function in the aggregate transformation to get the previous max value:

In both cases, you must join your incoming new data together with your source that contains the previous max value.

Data flow script

Syntax

Example

Sql Replace Non Numeric Values

The data flow script for the above surrogate key configuration is in the code snippet below.

Surrogate Key Generates Non-numeric Values Definition

Next steps

Surrogate Key Generates Non-numeric Values List

These examples use the Join and Derived Column transformations.