AreaCom: Make YearFrom nullable

Elwig/Resources/Sql/29-30.sql

@@ -0,0 +1,18 @@
+-- schema version 29 to 30
+
+PRAGMA writable_schema = ON;
+
+DROP VIEW v_bki_member;
+CREATE VIEW v_bki_member AS
+SELECT s.year, m.mgnr, m.lfbis_nr, m.name,
+       (COALESCE(m.prefix || ' ', '') || m.given_name || COALESCE(' ' || m.middle_names, '') || COALESCE(' ' || m.suffix, '')) AS other_names,
+       a.name AS billing_name, COALESCE(a.address, m.address) AS address,
+       COALESCE(a.country, m.country) AS country, COALESCE(a.postal_dest, m.postal_dest) AS postal_dest,
+       SUM(COALESCE(IIF((c.year_from IS NULL OR c.year_from <= s.year) AND (c.year_to IS NULL OR c.year_to >= s.year), c.area, NULL), 0)) AS area
+FROM season s, member m
+    LEFT JOIN member_billing_address a ON a.mgnr = m.mgnr
+    LEFT JOIN area_commitment c ON c.mgnr = m.mgnr
+GROUP BY s.year, m.mgnr;
+
+PRAGMA schema_version = 2901;
+PRAGMA writable_schema = OFF;