This scenario describes a Job that gathers together several input DB table schemas and
implementing a clause to filter the output using an SQL statement.

• Drop the following components from the Palette
  onto the design workspace: three tELTMysqlInput
  components, a tELTMysqlMap, and a tELTMysqlOutput. Label these components to best describe
  their functionality.

• Double-click the first tELTMysqlInput component
  to display its Basic settings view.

• Select Repository from the Schema list, click the three dot button preceding Edit schema, and select your DB connection and the
  desired schema from the [Repository Content] dialog
  box.

  The selected schema name appears in the Default Table
  Name field automatically.

  In this use case, the DB connection is
  Talend_MySQL and the schema for the
  first input component is owners.

• Set the second and third tELTMysqlInput
  components in the same way but select cars and
  resellers respectively as their schema names.

• Connect the three tELTMysqlInput components to
  the tELTMysqlMap component using links named
  following strictly the actual DB table names: owners,
  cars and resellers.

• Connect the tELTMysqlMap component to the
  tELTMysqlOutput component and name the link
  agg_result, which is the name of the database table you
  will save the aggregation result to.

• Click the tELTMysqlMap component to display its
  Basic settings view.

• Select Repository from the Property Type list, and select the same DB connection that you use
  for the input components.

  All the database details are automatically retrieved.

• Leave all the other settings as they are.

• Double-click the tELTMysqlMap component to launch
  the ELT Map editor to set up joins between the input tables and define the output
  flow.

• Add the input tables by clicking the green plus button at the upper left corner of
  the ELT Map editor and selecting the relevant table names in the [Add a new alias] dialog box.

• Drop the ID_Owner column from the owners
  table to the corresponding column of the cars table.

• In the cars table, select the Explicit
  join check box in front of the ID_Owner column.

  As the default join type, INNER JOIN is
  displayed on the Join list.

• Drop the ID_Reseller column from the
  cars table to the corresponding column of the
  resellers table to set up the second join, and define the
  join as an inner join in the same way.

• Select the columns to be aggregated into the output table,
  agg_result.

• Drop the ID_Owner, Name, and
  ID_Insurance columns from the owners
  table to the output table.

• Drop the Registration, Make, and
  Color columns from the cars table to
  the output table.

• Drop the Name_Reseller and City columns
  from the resellers table to the output table.

• With the relevant columns selected, the mappings are displayed in yellow and the
  joins are displayed in dark violet.

• Set up a filter in the output table. Click the Add filter
  row button on top of the output table to display the Additional clauses expression field, drop the
  City column from the resellers table
  to the expression field, and complete a WHERE clause that reads resellers.City
='Augusta'.

• Click the Generated SQL Select query tab to
  display the corresponding SQL statement.

• Click OK to save the ELT Map settings.

• Double-click the tELTMysqlOutput component to
  display its Basic settings view.

• Select an action from the Action on data list as
  needed.

• Select Repository as the schema type, and define
  the output schema in the same way as you defined the input schemas. In this use
  case, select agg_result as the output schema, which is the name
  of the database table used to store the mapping result.

• Leave all the other settings as they are.

• Save your Job and press F6 to launch it.

  All selected data is inserted in the agg_result table as
  specified in the SQL statement.