diff --git a/pyproject.toml b/pyproject.toml
index ebd7e38..a0d77dc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,9 @@ extended_capitalisation_policy = 'lower'
 [tool.sqlfluff.rules.capitalisation.keywords]
 capitalisation_policy = 'upper'
 
+[tool.sqlfluff.rules.capitalisation.literals]
+capitalisation_policy = 'upper'
+
 [tool.sqlfluff.rules.convention.terminator]
 multiline_newline = true
 require_final_semicolon = true
diff --git a/sqlite_export_for_ynab/ddl/create-relations.sql b/sqlite_export_for_ynab/ddl/create-relations.sql
index 26a14fe..3a47f47 100644
--- a/sqlite_export_for_ynab/ddl/create-relations.sql
+++ b/sqlite_export_for_ynab/ddl/create-relations.sql
@@ -163,12 +163,12 @@ SELECT
     , COALESCE(st.amount, t.amount) / -1000.0 AS amount_major
     , CASE
         WHEN
-            COALESCE(st.transfer_account_id, t.transfer_account_id) IS null
+            COALESCE(st.transfer_account_id, t.transfer_account_id) IS NULL
             THEN COALESCE(st.category_id, t.category_id)
     END AS category_id
     , CASE
         WHEN
-            COALESCE(st.transfer_account_id, t.transfer_account_id) IS null
+            COALESCE(st.transfer_account_id, t.transfer_account_id) IS NULL
             THEN COALESCE(st.category_name, t.category_name)
     END AS category_name
     , COALESCE(st.deleted, t.deleted) AS deleted
@@ -253,12 +253,12 @@ SELECT
     , COALESCE(st.amount, t.amount) / -1000.0 AS amount_major
     , CASE
         WHEN
-            COALESCE(st.transfer_account_id, t.transfer_account_id) IS null
+            COALESCE(st.transfer_account_id, t.transfer_account_id) IS NULL
             THEN COALESCE(st.category_id, t.category_id)
     END AS category_id
     , CASE
         WHEN
-            COALESCE(st.transfer_account_id, t.transfer_account_id) IS null
+            COALESCE(st.transfer_account_id, t.transfer_account_id) IS NULL
             THEN COALESCE(st.category_name, t.category_name)
     END AS category_name
     , COALESCE(st.deleted, t.deleted) AS deleted