Last Modified Date: 30 Jan 2019
Option 1Add matching values to the linking fields in both tables in the data source.
Option 2Rearrange tables in the join.
The table that contains all possible values in the linking field should be the leftmost table in the join, when the join type is Left Outer Join. (If neither table contains all possible values, this option will not work.)
Option 3Use a Full Outer join.
A Full Outer Join will include all records from both tables even when there is no matching values in the linking fields. Please note, data for which there were no matching values in the linking fields will not be related. Also note, the Full Outer join type is not available for all data sources.
For more information, see Connecting to Multiple Tables in Tableau Help.
CauseAn Inner join was used to join the tables. When using an Inner join, only values that appear in both tables are included. When using a Left join, all values from the table on the left side of the join are included.
Additional InformationSQL Joins by w3schools
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