This scenario describes a Job that maps information from two input tables and an alias
table, serving as a virtual input table, to an output table. The
employees table contains employees’ IDs, their department numbers,
their names, and the IDs of their respective managers. The managers are also considered as
employees and hence included in the employees table. The
dept table contains the department information. The alias table
retrieves the names of the managers from the employees table.

• Drop two tELTMysqlInput components, a tELTMysqlMap component, and a tELTMysqlOutput component to the design workspace, and label them to
  best describe their functionality.

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

• Select Repository from the Schema list, and define the DB connection and schema by clicking the
  three dot button preceding Edit schema.

  The DB connection is
  Talend_MySQL and the schema for the first input
  component is employees.

• Set the second tELTMysqlInput component in the
  same way but select dept as its schema.

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

• Select an action from the Action on data list as
  needed, Insert in this use case.

• 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 result as the output schema, which is the name of
  the database table used to store the mapping result.

  The output schema contains all the columns of the input schemas plus a
  ManagerName column.

• Leave all the other parameters as they are.

• Connect the two tELTMysqlInput components to the
  tELTMysqlMap component using Link connections named strictly after the actual input
  table names, employees and dept in this
  use case.

• Connect the tELTMysqlMap component to the
  tELTMysqlOutput component using a Link connection. When prompted, click Yes to allow the ELT Mapper to retrieve the output table
  structure from the output schema.

• Click the tELTMysqlMap component and select the
  Component tab 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 DB connection details are automatically retrieved.

• Leave all the other parameters as they are.

• Click the three-dot button next to ELT Mysql Map
  Editor or double-click the tELTMysqlMap component on the design workspace to launch the ELT Map
  editor.

  With the tELTMysqlMap component connected to the
  output component, the output table is displayed in the output area.

• Add the input tables, employees and
  dept, in the input area by clicking the green plus button and
  selecting the relevant table names in the [Add a new
  alias] dialog box.

• Create an alias table based on the employees table by
  selecting employees from the Select the
  table to use list and typing in Managers in the
  Type in a valid alias field in the [Add a new alias] dialog box.

• Drop the DeptNo column from the
  employees table to the dept
  table.

• Select the Explicit join check box in front of
  the DeptNo column of the dept table to set
  up an inner join.

• Drop the ManagerID column from the
  employees table to the ID column of
  the Managers table.

• Select the Explicit join check box in front of
  the ID column of the Managers table and
  select LEFT OUTER JOIN from the Join list to allow the output rows to contain Null
  values.

• Drop all the columns from the employees table to the
  corresponding columns of the output table.

• Drop the DeptName and Location columns
  from the dept table to the corresponding columns of the output
  table.

• Drop the Name column from the Managers
  table to the ManagerName column of the output table.

• Click on the Generated SQL Select query tab to
  display the SQL query statement to be executed.

• Save your Job and press F6 to run it.

  The output database table result contains all the
  information about the employees, including the names of their respective
  managers.