refactor CHPA hierarchy SQL

sql/chpa/01_dwd/01_dwd_ims_atc_hierarchy.sql

@@ -0,0 +1,86 @@
+-- Databricks notebook source
+-- =============================================================================
+-- Purpose    : Build the flattened IMS ATC level 1-4 hierarchy.
+-- Source     : dwd.dwd_ims_td_therapeutic_class
+-- Target     : dwd.dwd_ims_atc_hierarchy
+-- Grain      : One row per hierarchy path rooted at ATC1_CODE; lower levels may be null.
+-- Write mode : Full refresh (INSERT OVERWRITE).
+-- Downstream : dwd.dwd_ims_td_pack_property, dws.dws_ims_td_atc_cn
+-- Notes      : Parent-code matching is preserved from the legacy script.
+-- =============================================================================
+
+INSERT OVERWRITE TABLE dwd.dwd_ims_atc_hierarchy (
+    ATC1_ID,
+    ATC1_CODE,
+    ATC1_DES,
+    ATC2_ID,
+    ATC2_CODE,
+    ATC2_DES,
+    ATC3_ID,
+    ATC3_CODE,
+    ATC3_DES,
+    ATC4_ID,
+    ATC4_CODE,
+    ATC4_DES
+)
+WITH therapeutic_class AS (
+    SELECT
+        therapeutic_id,
+        therapeutic_code,
+        therapeutic_name,
+        therapeutic_level
+    FROM dwd.dwd_ims_td_therapeutic_class
+),
+atc_level_1 AS (
+    SELECT
+        therapeutic_id AS atc1_id,
+        therapeutic_code AS atc1_code,
+        therapeutic_name AS atc1_des
+    FROM therapeutic_class
+    WHERE therapeutic_level = '1'
+),
+atc_level_2 AS (
+    SELECT
+        therapeutic_id AS atc2_id,
+        therapeutic_code AS atc2_code,
+        therapeutic_name AS atc2_des
+    FROM therapeutic_class
+    WHERE therapeutic_level = '2'
+),
+atc_level_3 AS (
+    SELECT
+        therapeutic_id AS atc3_id,
+        therapeutic_code AS atc3_code,
+        therapeutic_name AS atc3_des
+    FROM therapeutic_class
+    WHERE therapeutic_level = '3'
+),
+atc_level_4 AS (
+    SELECT
+        therapeutic_id AS atc4_id,
+        therapeutic_code AS atc4_code,
+        therapeutic_name AS atc4_des
+    FROM therapeutic_class
+    WHERE therapeutic_level = '4'
+)
+SELECT
+    atc_level_1.atc1_id,
+    atc_level_1.atc1_code,
+    atc_level_1.atc1_des,
+    atc_level_2.atc2_id,
+    atc_level_2.atc2_code,
+    atc_level_2.atc2_des,
+    atc_level_3.atc3_id,
+    atc_level_3.atc3_code,
+    atc_level_3.atc3_des,
+    atc_level_4.atc4_id,
+    atc_level_4.atc4_code,
+    atc_level_4.atc4_des
+FROM atc_level_1
+LEFT JOIN atc_level_2
+    ON atc_level_1.atc1_code = LEFT(atc_level_2.atc2_code, 1)
+LEFT JOIN atc_level_3
+    ON atc_level_2.atc2_code = LEFT(atc_level_3.atc3_code, 3)
+LEFT JOIN atc_level_4
+    ON atc_level_3.atc3_code = LEFT(atc_level_4.atc4_code, 4)
+;

sql/chpa/01_dwd/02_dwd_ims_nfc_hierarchy.sql

@@ -0,0 +1,70 @@
+-- Databricks notebook source
+-- =============================================================================
+-- Purpose    : Build the flattened IMS NFC level 1-3 hierarchy.
+-- Source     : dwd.dwd_ims_td_new_form_class
+-- Target     : dwd.dwd_ims_nfc_hierarchy
+-- Grain      : One row per hierarchy path rooted at NFC1_CODE; lower levels may be null.
+-- Write mode : Full refresh (INSERT OVERWRITE).
+-- Downstream : dwd.dwd_ims_td_pack_property, dws.dws_ims_td_nfc_cn
+-- Notes      : Parent-code matching is preserved from the legacy script.
+-- =============================================================================
+
+INSERT OVERWRITE TABLE dwd.dwd_ims_nfc_hierarchy (
+    NFC1_ID,
+    NFC1_CODE,
+    NFC1_DES,
+    NFC2_ID,
+    NFC2_CODE,
+    NFC2_DES,
+    NFC3_ID,
+    NFC3_CODE,
+    NFC3_DES
+)
+WITH new_form_class AS (
+    SELECT
+        newformclass_id,
+        newformclass_code,
+        newformclass_name,
+        newformclass_level
+    FROM dwd.dwd_ims_td_new_form_class
+),
+nfc_level_1 AS (
+    SELECT
+        newformclass_id AS nfc1_id,
+        newformclass_code AS nfc1_code,
+        newformclass_name AS nfc1_des
+    FROM new_form_class
+    WHERE newformclass_level = '1'
+),
+nfc_level_2 AS (
+    SELECT
+        newformclass_id AS nfc2_id,
+        newformclass_code AS nfc2_code,
+        newformclass_name AS nfc2_des
+    FROM new_form_class
+    WHERE newformclass_level = '2'
+),
+nfc_level_3 AS (
+    SELECT
+        newformclass_id AS nfc3_id,
+        newformclass_code AS nfc3_code,
+        newformclass_name AS nfc3_des
+    FROM new_form_class
+    WHERE newformclass_level = '3'
+)
+SELECT
+    nfc_level_1.nfc1_id,
+    nfc_level_1.nfc1_code,
+    nfc_level_1.nfc1_des,
+    nfc_level_2.nfc2_id,
+    nfc_level_2.nfc2_code,
+    nfc_level_2.nfc2_des,
+    nfc_level_3.nfc3_id,
+    nfc_level_3.nfc3_code,
+    nfc_level_3.nfc3_des
+FROM nfc_level_1
+LEFT JOIN nfc_level_2
+    ON nfc_level_1.nfc1_code = LEFT(nfc_level_2.nfc2_code, 1)
+LEFT JOIN nfc_level_3
+    ON nfc_level_2.nfc2_code = LEFT(nfc_level_3.nfc3_code, 2)
+;