Query to check not valid constraints (#34)

* Query to check not valid constraints

* request approve

Author: BLoHny

sql/check_not_valid_constraints.sql

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2019-2024. Ivan Vakhrushev and others.
+ * https://github.com/mfvanek/pg-index-health-sql
+ *
+ * Licensed under the Apache License 2.0
+ */
+
+select
+    t.relname as table_name, -- Name of the table
+    c.conname as constraint_name, -- Name of the constraint
+    c.contype as constraint_type  -- Type of the constraint
+from
+    pg_catalog.pg_constraint c
+    join pg_catalog.pg_class t on t.oid = c.conrelid
+    join pg_catalog.pg_namespace n on n.oid = t.relnamespace
+where
+    not c.convalidated -- Constraints that have not yet been validated
+    and c.contype in ('c', 'f') -- Focus on check and foreign key constraints
+    and n.nspname = :schema_name_param::text; -- Make the query schema-aware