re-write

Author: stayseesong

src/unify/data-graph/index.md

@@ -354,17 +354,25 @@ For many:many relationships, define the join on between the two entity tables wi
 
 **Junction table spec**
 
-> info ""
-> When used in junctions tables, `left join` is the column on the junction table to link with the parent (left) entity, and `right join` is the column on the junction table to join with the child (right) entity. These values don’t manipulate the type of join - they are always `INNER JOINS`.
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 | Parameters      |Definition  |
 | --------------- | --------------------------------- |
 | `table_ref`     | Defines the fully qualified table reference to the join table: `[database name].[schema name].[table name]`. Segment flexibly supports tables, views and materialized views                                                                                             |
 | `primary_key`   | The unique identifier for the given table. Must be a column with unique values per row                                                                                                                                                                                 |
 | `left_join_on`  | Define the relationship between the left entity table and the junction table: `[left entity slug].[column name] = [junction table column name]`. Note that schema and table are implied within the junction table column name, so you do not need to define it again   |
 | `right_join_on` | Define the relationship between the junction table and the right entity table: `[junction table column name] = [right entity slug].[column name]`. Note that schema and table are implied within the junction table column name, so you do not need to define it again |
 
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+When you define a many-to-many relationship using a junction table, `left_join_on` and `right_join_on` tell Data Graph how to connect each entity to the junction table:
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+* Use `left_join_on` to specify which column in the junction table links to the parent (left) entity.
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+* Use `right_join_on` to specify which column links to the child (right) entity.
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+These fields define the join conditions, but they don’t control how the join is executed. Data Graph always performs inner joins, even if you specify a `left_join_on`.
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+If you need behavior similar to a left join (like including unmatched rows), create a view in your warehouse with the logic you’re targeting and reference that view as an entity in your graph.
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+
 **Example:**
 
 ```python