The Definitive Guide to Data Quality
Which DB type are you using? Let's assuming you are using Mysql, select records from the two table and do inner join on tMap base on the primary key, the job looks like:
tMysqlInput_1(select records from table a)-----main---tMap---main---tLogRow
tMysqlInput_2(select records from table b)
Maybe there exists space in some value, go to check it and trim the value before doing the join on tMap.
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Part 2 of a series on Context Variables
Learn how to do cool things with Context Variables
Find out how to migrate from one database to another using the Dynamic schema