Add dynamic table example per discussion in #12 (#56)

Author: dandv

README.md

@@ -227,9 +227,9 @@ sql.notify('news', JSON.stringify({ no: 'this', is: 'news' }))
 
 This also means you cannot write dynamic queries or concat queries together by simple string manipulation. To enable dynamic queries in a safe way, the `sql` function doubles as a regular function which escapes any value properly. It also includes overloads for common cases of inserting, selecting, updating and querying.
 
-## Dynamic query helpers `sql() inside tagged template`
+## Dynamic query helpers - `sql()` inside tagged template
 
-Postgres.js has a safe, ergonomic way to aid you in writing queries. This makes it easier to write dynamic inserts, selects, updates and where queries.
+Postgres.js has a safe, ergonomic way to aid you in writing queries. This makes it easier to write dynamic `insert`, `select` and `update` queries, and pass `where` parameters.
 
 #### Insert
 
@@ -272,7 +272,6 @@ sql`
     sql(users, 'name', 'age')
   }
 `
-
 ```
 
 #### Update
@@ -312,6 +311,20 @@ sql`
 select name, age from users
 ```
 
+#### Dynamic table name
+
+```js
+
+const table = 'users'
+
+sql`
+  select id from ${sql(table)}
+`
+
+// Is translated into this query:
+select id from users
+```
+
 #### Arrays `sql.array(Array)`
 
 PostgreSQL has a native array type which is similar to js arrays, but only allows the same type and shape for nested items. This method automatically infers the item type and serializes js arrays into PostgreSQL arrays.