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Add a SQL example for `not` [ci skip]

To share a certain logic across other examples, let's add a sample SQL
code generated by the given Ruby code
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1 parent 3f29a65 commit a8d1412a3227ac3d14a40f0e62c9cd83b515ff95 @robin850 robin850 committed Jul 26, 2013
Showing with 7 additions and 1 deletion.
  1. +7 −1 guides/source/active_record_querying.md
@@ -514,7 +514,13 @@ SELECT * FROM clients WHERE (clients.orders_count IN (1,3,5))
Post.where.not(author: author)
```
-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 code like this:
+
+```sql
+SELECT * FROM posts WHERE (author_id != 1)
+```
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