tSQLTemplateAggregate Standard properties - 7.3

Database Type

Select the database type you want to connect to from the list.

Component List

Select the relevant DB connection component in the list if you use more than one connection in the current Job.

Database name

Name of the database.

Source table name

Name of the table holding the data you want to collect values from.

Target table name

Name of the table you want to write the collected and transformed data in.

Schema and Edit schema

A schema is a row description, that is to say, it defines the number of fields that will be processed and passed on to the next component. The schema is either built-in or remote in the Repository.

Click Edit schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

• View schema: choose this option to view the schema only.

• Change to built-in property: choose this option to change the schema to Built-in for local changes.

• Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion. If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.

Built-in: You create and store the schema locally for this component only. Related topic: see Talend Studio User Guide.

Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job flowcharts. Related topic: see Talend Studio User Guide.

Operations

Select the type of operation along with the value to use for the calculation and the output field.

Output Column: Select the destination field in the list.

Function: Select any of the following operations to perform on data: count, min, max, avg, sum, and count (distinct).

Input column position: Select the input column from which you want to collect the values to be aggregated.

Group by

Define the aggregation sets, the values of which will be used for calculations.

Output Column: Select the column label in the list offered according to the schema structure you defined. You can add as many output columns as you wish to make more precise aggregations.

Input Column position: Match the input column label with your output columns, in case the output label of the aggregation set needs to be different.

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at a Job level as well as at each component level.

Global Variables

NB_LINE: the number of rows read by an input component or transferred to an output component. This is an After variable and it returns an integer.

QUERY: the query statement being processed. This is a Flow variable and it returns a string.

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl + Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio User Guide.

Usage rule

This component is used as an intermediate component with other relevant DB components, especially the DB connection and commit components.

SQL Template

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