remove "just"

episodes/00-sql-introduction.md

@@ -147,7 +147,7 @@ screen under Database Structure tab. Here you will see a list under "Tables." Ea
 we were exploring earlier. To see the contents of any table, right-click on it, and
 then click the "Browse Table" from the menu, or select the "Browse Data" tab next to the "Database Structure" tab and select the wanted table from the dropdown named "Table". This will
 give us a view that we're used to - a copy of the table. Hopefully this
-helps to show that a database is, in some sense, just a collection of tables,
+helps to show that a database is, in some sense, a collection of tables,
 where there's some value in the tables that allows them to be connected to each
 other (the "related" part of "relational database").