Add SQL examples for equality and NOT [ci skip]

guides/source/active_record_querying.md

@@ -472,6 +472,12 @@ NOTE: Only equality, range and subset checking are possible with Hash conditions
 Client.where(locked: true)
 ```
 
+This will generate SQL like this:
+
+```sql
+SELECT * FROM clients WHERE (clients.locked = 1)
+```
+
 The field name can also be a string:
 
 ```ruby
@@ -517,13 +523,17 @@ SELECT * FROM clients WHERE (clients.orders_count IN (1,3,5))
 
 ### NOT Conditions
 
-`NOT` SQL queries can be built by `where.not`.
+`NOT` SQL queries can be built by `where.not`:
 
 ```ruby
-Article.where.not(author: author)
+Client.where.not(locked: true)
 ```
 
-In other words, this query can be generated by calling `where` with no argument, then immediately chain with `not` passing `where` conditions.
+In other words, this query can be generated by calling `where` with no argument, then immediately chain with `not` passing `where` conditions.  This will generate SQL like this:
+
+```sql
+SELECT * FROM clients WHERE (clients.locked != 1)
+```
 
 Ordering
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