Update Understanding SQL Queries.md

Amogh Singhal · web-flow · commit 15b0facced10 · 2020-07-12T12:13:10.000+05:30
diff --git a/Understanding SQL Queries.md b/Understanding SQL Queries.md
@@ -172,6 +172,6 @@ GROUP BY 1,2
 | column_name       | data_type     |
 --- | --- | 
 | user_id       | int     |     
-| liked_page    | varchar| 
+| page_id    | int| 
 
 #### It should not recommend pages you already like.
