Merge pull request #5931 from nikbas/fix-broken-link

docs/guide/db-query-builder.md

@@ -3,7 +3,7 @@ Query Builder and Query
 
 > Note: This section is under development.
 
-Yii provides a basic database access layer as described in the [Database basics](database-basics.md) section.
+Yii provides a basic database access layer as described in the [Database basics](db-dao.md) section.
 The database access layer provides a low-level way to interact with the database. While useful in some situations,
 it can be tedious and error-prone to write raw SQLs. An alternative approach is to use the Query Builder.
 The Query Builder provides an object-oriented vehicle for generating queries to be executed.