Add note to documentation

Author: sclubricants

user_guide_src/source/database/query_builder.rst

@@ -882,6 +882,8 @@ You can also insert from a query:
 
 .. literalinclude:: query_builder/117.php
 
+.. note:: It is required to alias the columns of the select query to match those of the target table. 
+
 .. _upsert-data:
 
 **************
@@ -946,6 +948,8 @@ You can also upsert from a query:
 
 .. literalinclude:: query_builder/115.php
 
+.. note:: It is required to alias the columns of the select query to match those of the target table.
+
 $builder->onConstraint()
 ------------------------
 
@@ -1086,6 +1090,8 @@ You can also update from a query:
 
 .. literalinclude:: query_builder/116.php
 
+.. note:: It is required to alias the columns of the select query to match those of the target table.
+
 $builder->getCompiledUpdate()
 -----------------------------