Lab

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Include : Expression , joiner , Include : Expression , joiner , lookup , filterlookup , filter

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•• Expression , joiner , lookup , filterExpression , joiner , lookup , filter

What we will learn today …..


Lab DetailsLab Details Aim : to load students marks data into target, and also to filteAim : to load students marks data into target, and also to filter failed r failed

students record and load them to a separate table.students record and load them to a separate table.

Source 1 : Source 1 : student_marksstudent_marksCols : Cols : roll_noroll_no , SUBJECT_ID , marks , SUBJECT_ID , marks

Source 2 : Source 2 : student_roll_nostudent_roll_noCols : Cols : roll_noroll_no , , student_namestudent_name

Source 3 : Source 3 : student_subjectstudent_subjectCols : SUBJECT_NAME , SUBJECT_ID Cols : SUBJECT_NAME , SUBJECT_ID

Target 1 : Target 1 : student_resultstudent_resultCols : Cols : student_namestudent_name , SUBJECT_NAME , marks , status , SUBJECT_NAME , marks , status

Target 2 : for failed Students : Target 2 : for failed Students : fail_student_resultfail_student_result((Cols : Cols : student_namestudent_name , SUBJECT_NAME , marks , status, SUBJECT_NAME , marks , status


LogicLogicWe will use joiner to join data of We will use joiner to join data of student_marksstudent_marks and and

student_roll_nostudent_roll_no table using key table using key ‘‘roll_noroll_no ’’..

Then we will use lookThen we will use look--up to table : up to table : student_subjectstudent_subject to get the to get the subject name based on SUBJECT_ID .subject name based on SUBJECT_ID .

After that we will calculate After that we will calculate status(Failstatus(Fail/Pass) based on student /Pass) based on student marks. marks.

Condition : marks >= 50 will be considered as pass,Condition : marks >= 50 will be considered as pass,Marks < 50 will be considered as fail.Marks < 50 will be considered as fail.All records will be loaded to All records will be loaded to student_resultstudent_result

In the end we will filter records on the basis of status to loadIn the end we will filter records on the basis of status to loadinto table : into table : fail_student_resultfail_student_result


MappingMapping


Step 1Step 1

Use joiner to join two tables: Use joiner to join two tables: mention joining condition also in mention joining condition also in condition tab.condition tab.



Step 2Step 2 Use look up to get subject name using subject id Use look up to get subject name using subject id

and pass subject name to next expression.and pass subject name to next expression.


Look up conditionLook up condition


Step 3 : Step 3 :

Calculate Calculate ‘‘statusstatus’’ based on marks in based on marks in expression transformationexpression transformation


Step 4Step 4

Connect expression to Target in Connect expression to Target in which all records will be loaded.which all records will be loaded.


Step 5Step 5

Use filter to load only failed students Use filter to load only failed students records to another table.records to another table.


Filter conditionFilter condition


Mapping complete !Mapping complete !


End Of LabEnd Of Lab

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