feat: add employee dataa view

migrations/schemas/20230419095554-add_employee_data_view.sql

@@ -0,0 +1,54 @@
+-- +migrate Up
+CREATE OR REPLACE VIEW vw_employee_count_by_chapter AS
+    WITH chapter_data as (
+        SELECT c.id,
+        CASE
+            WHEN c.code IN ('backend', 'web', 'mobile', 'blockchain', 'devops', 'data') THEN 'Developer'
+            WHEN c.code = 'qa' THEN 'QA'
+            WHEN c.code = 'design' THEN 'Designer'
+            WHEN c.code IN ('operations', 'pm') THEN 'Operation'
+            WHEN c.code = 'sales' THEN 'Sales'
+            ELSE c.code
+        END AS chapter_group_name,
+        c.name,
+        c.code,
+        c.lead_id
+        FROM chapters c
+    )
+    SELECT
+        chapter_data.chapter_group_name,
+        COUNT(DISTINCT (ec.employee_id)) AS employee_count
+    FROM chapter_data
+         LEFT JOIN employee_chapters ec ON ec.chapter_id = chapter_data.id
+         LEFT JOIN employees e ON ec.employee_id = e.id
+    WHERE e.working_status IN ('probation', 'full-time', 'contractor')
+    GROUP BY chapter_data.chapter_group_name
+    ORDER BY employee_count DESC
+;
+
+CREATE OR REPLACE VIEW vw_employees_recently_joined AS
+    SELECT *
+    FROM employees
+    WHERE joined_date BETWEEN CURRENT_DATE - INTERVAL '7 days' AND CURRENT_DATE
+;
+
+CREATE OR REPLACE VIEW vw_employees_project_charge_rates AS
+    WITH time as (SELECT NOW() as now)
+    SELECT e.id as employee_id, e.full_name, pm.project_id, pm.rate, ba.currency_id
+    FROM time,
+         project_members pm
+             JOIN projects p ON pm.project_id = p.id
+             JOIN employees e ON pm.employee_id = e.id
+             JOIN bank_accounts ba on p.bank_account_id = ba.id
+    WHERE e.working_status IN ('probation', 'full-time', 'contractor')
+      AND p.type = 'time-material'
+      AND p.status = 'active'
+      AND (pm.start_date <= time.now::DATE AND (pm.end_date IS NULL OR pm.end_date <= time.now::DATE))
+      AND pm.rate > 0
+      AND pm.deployment_type = 'official'
+;
+
+-- +migrate Down
+DROP VIEW vw_employee_count_by_chapter;
+DROP VIEW vw_employees_recently_joined;
+DROP VIEW vw_employees_project_charge_rates;