Merge pull request #100258 from timsander1/master

case insensitive search note

Author: PRMerger13

articles/cosmos-db/sql-query-lower.md

@@ -10,7 +10,9 @@ ms.custom: query-reference
 ---
 # LOWER (Azure Cosmos DB)
  Returns a string expression after converting uppercase character data to lowercase.  
-  
+
+The LOWER system function does not utilize the index. If you plan to do frequent case insensitive comparisons, the LOWER system function may consume a significant amount of RU's. If this is the case, instead of using the LOWER system function to normalize data each time for comparisons, you can normalize the casing upon insertion. Then a query such as SELECT * FROM c WHERE LOWER(c.name) = 'bob' simply becomes SELECT * FROM c WHERE c.name = 'bob'.
+
 ## Syntax
 
 ```sql

articles/cosmos-db/sql-query-upper.md

@@ -10,7 +10,9 @@ ms.custom: query-reference
 ---
 # UPPER (Azure Cosmos DB)
  Returns a string expression after converting lowercase character data to uppercase.  
-  
+
+The UPPER system function does not utilize the index. If you plan to do frequent case insensitive comparisons, the UPPER system function may consume a significant amount of RU's. If this is the case, instead of using the UPPER system function to normalize data each time for comparisons, you can normalize the casing upon insertion. Then a query such as SELECT * FROM c WHERE UPPER(c.name) = 'BOB' simply becomes SELECT * FROM c WHERE c.name = 'BOB'.
+
 ## Syntax
 
 ```sql