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+# Useful Queries
+
+## Overview
+
+This document contains some queries which can be used as good starting points for analysis of the workforce data.
+
+## Queries
+
+### Get count of records with Withdrawal Indicator 'W' that reverts in future extracts
+
+A check for the reliability of the Withdrawal Indicator by establishments to indicate a person has left employment
+
+```
+WITH withdrawal_indicator_revert_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE
+		withdrawl_indicator = 'W'
+		AND EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.extract_date > x1.extract_date
+				   		AND x2.withdrawl_indicator IS NULL)
+)
+SELECT
+	COUNT(1)
+FROM
+	withdrawal_indicator_revert_keys
+```
+
+### Get examples of records with Withdrawal Indicator 'W' that reverts in future extracts
+
+A check for the reliability of the Withdrawal Indicator by establishments to indicate a person has left employment
+
+```
+WITH withdrawal_indicator_revert_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE
+		withdrawl_indicator = 'W'
+		AND EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.extract_date > x1.extract_date
+				   		AND x2.withdrawl_indicator IS NULL)
+)
+SELECT
+	trn,
+	local_authority_code,
+	establishment_number,	
+	employment_start_date,
+	employment_end_date,
+	CASE
+		WHEN employment_type = 0 THEN 'FT'
+		WHEN employment_type = 1 THEN 'PTR'
+		WHEN employment_type = 2 THEN 'PTI'
+		WHEN employment_type = 3 THEN 'PT'
+	END employment_type,
+	withdrawl_indicator,
+	extract_date
+FROM
+	tps_csv_extract_items x
+WHERE
+	EXISTS (SELECT
+		   		1
+		    FROM
+		   		withdrawal_indicator_revert_keys w
+		    WHERE
+		   		w.key = x.key)
+ORDER BY
+	x.key desc,
+	x.extract_date
+LIMIT 1000
+```
+
+### Get count of records with Withdrawal Indicator 'W' that change end date in future extracts
+
+A check for the reliability of the Withdrawal Indicator by establishments to indicate a person has left employment
+
+```
+WITH withdrawal_end_date_change_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE
+		withdrawl_indicator = 'W'
+		AND EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.extract_date > x1.extract_date
+						AND x2.withdrawl_indicator = 'W'
+				   		AND x2.employment_end_date <> x1.employment_end_date)
+)
+SELECT
+	COUNT(1)
+FROM
+	withdrawal_end_date_change_keys
+```
+
+### Get examples of records with Withdrawal Indicator 'W' that change end date in future extracts
+
+A check for the reliability of the Withdrawal Indicator by establishments to indicate a person has left employment
+
+```
+WITH withdrawal_end_date_change_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE
+		withdrawl_indicator = 'W'
+		AND EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.extract_date > x1.extract_date
+						AND x2.withdrawl_indicator = 'W'
+				   		AND x2.employment_end_date <> x1.employment_end_date)
+)
+SELECT
+	trn,
+	local_authority_code,
+	establishment_number,	
+	employment_start_date,
+	employment_end_date,
+	CASE
+		WHEN employment_type = 0 THEN 'FT'
+		WHEN employment_type = 1 THEN 'PTR'
+		WHEN employment_type = 2 THEN 'PTI'
+		WHEN employment_type = 3 THEN 'PT'
+	END employment_type,
+	withdrawl_indicator,
+	extract_date
+FROM
+	tps_csv_extract_items x
+WHERE
+	EXISTS (SELECT
+		   		1
+		    FROM
+		   		withdrawal_end_date_change_keys w
+		    WHERE
+		   		w.key = x.key)
+ORDER BY
+	x.key desc,
+	x.extract_date
+LIMIT 1000
+```
+
+### Get count of records with Withdrawal Indicator 'W' that don't change end date or revert in future extracts
+
+A check for the reliability of the Withdrawal Indicator by establishments to indicate a person has left employment
+
+```
+WITH withdrawal_no_change_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE
+		withdrawl_indicator = 'W'
+		AND EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.extract_date > x1.extract_date)
+		AND NOT EXISTS (SELECT
+							1
+						FROM
+							tps_csv_extract_items x2
+						WHERE
+							x2.key = x1.key
+							AND x2.extract_date > x1.extract_date
+							AND (x2.withdrawl_indicator IS NULL OR x2.employment_end_date <> x1.employment_end_date))
+)
+SELECT
+	COUNT(1)
+FROM
+	withdrawal_no_change_keys
+```
+
+### Get counts of records where the end date hasn't changed for over 5 months and there is no further alternative employment
+
+This gives an idea of people who have potentially left the teaching profession
+
+```
+WITH latest_extracts AS (
+	SELECT
+		*
+	FROM
+		(SELECT
+			trn,
+		 	local_authority_code,
+		 	establishment_number,
+		 	employment_start_date,
+		 	employment_end_date,
+		 	employment_type,
+		 	withdrawl_indicator,
+		 	extract_date,
+		 	key,
+		 	ROW_NUMBER() OVER (PARTITION BY key ORDER BY extract_date desc) as row_number
+		 FROM
+			tps_csv_extract_items) x
+	WHERE
+		x.row_number = 1		 	
+)
+SELECT
+	SUM(CASE WHEN withdrawl_indicator = 'W' THEN 1 ELSE 0 END) as count_with_withdrawal_indicator,
+	SUM(CASE WHEN withdrawl_indicator IS NULL THEN 1 ELSE 0 END) as count_without_withdrawal_indicator
+FROM
+	latest_extracts x1
+WHERE
+	AGE(x1.extract_date, x1.employment_end_date) > INTERVAL '5 months'
+	AND NOT EXISTS (SELECT
+					   		1
+					    FROM
+					   		latest_extracts x2
+					    WHERE
+					   		x2.trn = x1.trn
+							AND x2.key <> x1.key
+							AND AGE(x2.extract_date, x2.employment_end_date) <= INTERVAL '5 months')
+```
+
+### Get counts of records which are in the first extract and missing from multiple extracts before re-appearing in the most recent extract
+
+This is to check that it is indeed possible that records can skip multiple extracts and later re-appear
+
+```
+WITH keys AS (
+	SELECT
+		*,
+	    CASE 
+			WHEN extract_date = to_date('20240325','YYYYMMDD') THEN 1 
+			WHEN extract_date = to_date('20240425','YYYYMMDD') THEN 2
+			WHEN extract_date = to_date('20240525','YYYYMMDD') THEN 3 
+			WHEN extract_date = to_date('20240626','YYYYMMDD') THEN 4 
+		END as extract_number
+	FROM
+		tps_csv_extract_items
+	WHERE
+		extract_date <> to_date('20240307','YYYYMMDD')
+)
+SELECT
+	COUNT(1)
+FROM
+	keys k1
+WHERE
+	k1.extract_number = 1
+	AND NOT EXISTS (SELECT
+			   			1
+			    	FROM
+			   		    keys k2
+				    WHERE
+						k2.key = k1.key
+						AND k2.extract_number in (2, 3))
+	AND EXISTS (SELECT
+			   			1
+			    	FROM
+			   		    keys k4
+				    WHERE
+						k4.key = k1.key
+						AND k4.extract_number = 4)
+```
+
+### Get counts of employment types with Withdrawal Indicator 'W' 
+
+Check that the Withrawal Indicator can also be applied to part-time employment
+
+```
+SELECT
+	extract_date,
+	SUM(CASE WHEN employment_type = 0 THEN 1 ELSE 0 END) full_time_count,
+	SUM(CASE WHEN employment_type = 1 THEN 1 ELSE 0 END) part_time_regular_count,
+	SUM(CASE WHEN employment_type = 2 THEN 1 ELSE 0 END) part_time_irregular_count,
+	SUM(CASE WHEN employment_type = 3 THEN 1 ELSE 0 END) part_time_count
+FROM
+	tps_csv_extract_items
+WHERE
+	withdrawl_indicator = 'W'
+GROUP BY
+	extract_date
+```
+
+### Check if we are getting data with end dates within the expected date range (i.e. 6 months of the extract date) 
+
+This is a sanity check on the data
+
+```
+SELECT
+	extract_date,
+	MIN(employment_end_date) min_employment_end_date,
+	(date_trunc('month', extract_date) - interval '6 month')::date expected_minimum_end_date
+FROM
+	tps_csv_extract_items
+GROUP BY
+	extract_date
+```
+
+###  Get the count end dates which are beyond the end of the month of the extract date
+
+We appear to get records where the end date is in the future
+
+```
+WITH latest_extracts AS (
+	SELECT
+		*,
+		(date_trunc('month', extract_date) + interval '1 month' - interval '1 day')::date report_end_date
+	FROM
+		(SELECT
+			trn,
+		 	local_authority_code,
+		 	establishment_number,
+		 	employment_start_date,
+		 	employment_end_date,
+		 	employment_type,
+		 	withdrawl_indicator,
+		 	extract_date,
+		 	key,
+		 	ROW_NUMBER() OVER (PARTITION BY key ORDER BY extract_date desc) as row_number
+		 FROM
+			tps_csv_extract_items) x
+	WHERE
+		x.row_number = 1		 	
+)
+SELECT
+	COUNT(1)
+FROM
+	latest_extracts
+WHERE
+	employment_end_date > report_end_date
+```
+
+### Get count of people who are in multiple full time employments at the same time
+
+```
+WITH overlapping_full_time AS (
+	SELECT
+		distinct pe1.person_id
+	FROM
+		person_employments pe1
+	WHERE
+		pe1.start_date <= pe1.last_known_employed_date
+		AND pe1.employment_type = 0
+		AND EXISTS (SELECT
+			     		1
+			        FROM
+			   		    person_employments pe2
+			        WHERE
+						pe1.person_id = pe2.person_id
+						AND pe1.person_employment_id <> pe2.person_employment_id
+				   		AND pe2.employment_type = 0
+						AND pe2.start_date <= pe2.last_known_employed_date
+				   		AND daterange(pe1.start_date, pe1.last_known_employed_date,'[]') && daterange(pe2.start_date, pe2.last_known_employed_date,'[]'))
+)
+SELECT
+	COUNT(1)
+FROM
+	overlapping_full_time
+```
+
+### Examples of people who are in multiple full time employments at the same time
+
+```
+WITH overlapping_full_time AS (
+	SELECT
+		distinct pe1.person_id
+	FROM
+		person_employments pe1
+	WHERE
+		pe1.start_date <= pe1.last_known_employed_date
+		AND pe1.employment_type = 0
+		AND EXISTS (SELECT
+			     		1
+			        FROM
+			   		    person_employments pe2
+			        WHERE
+						pe1.person_id = pe2.person_id
+						AND pe1.person_employment_id <> pe2.person_employment_id
+				   		AND pe2.employment_type = 0
+						AND pe2.start_date <= pe2.last_known_employed_date
+				   		AND daterange(pe1.start_date, pe1.last_known_employed_date,'[]') && daterange(pe2.start_date, pe2.last_known_employed_date,'[]'))
+)
+SELECT
+	p.trn,
+    e.la_code,
+    e.establishment_number,
+	substr(e.establishment_name, 1, 30),
+	pe.start_date,
+	pe.last_known_employed_date	
+FROM
+		person_employments pe
+	JOIN
+		persons p ON p.person_id = pe.person_id
+	JOIN
+		establishments e ON e.establishment_id = pe.establishment_id
+WHERE
+	pe.employment_type = 0
+	AND EXISTS (SELECT
+		   		1
+		    FROM
+		   		overlapping_full_time o
+		    WHERE
+		   		o.person_id = pe.person_id)
+ORDER BY
+	p.trn,
+	start_date
+```
+
+### Get most frequent end dates for extract
+
+Check which are the most frequent end dates for a given extract
+
+```
+SELECT
+	employment_end_date,
+	COUNT(1)
+FROM
+	tps_csv_extract_items
+WHERE
+	extract_date = to_date('20240626','YYYYMMDD')
+GROUP BY
+	employment_end_date
+ORDER BY 
+	COUNT(1) DESC
+LIMIT 10
+```
+
+### Get count of records which change employment type between extracts
+
+```
+WITH updated_employment_type_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE		
+		EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.employment_type <> x1.employment_type
+						AND x2.extract_date > x1.extract_date)
+)
+SELECT
+	COUNT(key)
+FROM
+	updated_employment_type_keys
+```
+
+### Get example records which change employment type between extracts
+
+```
+WITH updated_employment_type_keys AS (
+	SELECT
+		distinct key
+	FROM
+		tps_csv_extract_items x1
+	WHERE
+		EXISTS (SELECT
+			   			1
+			    	FROM
+			   			tps_csv_extract_items x2
+				    WHERE
+				   		x2.key = x1.key
+						AND x2.employment_type <> x1.employment_type
+						AND x2.extract_date > x1.extract_date)
+)
+SELECT
+	trn,
+	local_authority_code,
+	establishment_number,	
+	employment_start_date,
+	employment_end_date,
+	CASE
+		WHEN employment_type = 0 THEN 'FT'
+		WHEN employment_type = 1 THEN 'PTR'
+		WHEN employment_type = 2 THEN 'PTI'
+		WHEN employment_type = 3 THEN 'PT'
+	END employment_type,
+	withdrawl_indicator,
+	extract_date
+FROM
+	tps_csv_extract_items x
+WHERE
+	EXISTS (SELECT
+		   		1
+		    FROM
+		   		updated_employment_type_keys e
+		    WHERE
+		   		e.key = x.key)
+ORDER BY
+	x.key desc,
+	x.extract_date
+LIMIT 1000
+```
+
+### Get all TPS establishments not in the Establishment Codes PDF ranges
+
+```
+WITH unique_gias_establishments AS (
+    SELECT
+        establishment_id,
+        la_code,
+        la_name,
+        establishment_number,
+        establishment_name,
+        establishment_type_code,
+        postcode
+    FROM
+        (SELECT
+            establishment_id,
+            la_code,
+            la_name,
+            establishment_number,
+            establishment_name,
+            establishment_type_code,
+            postcode,
+            ROW_NUMBER() OVER (PARTITION BY la_code, establishment_number, CASE WHEN establishment_number IS NULL THEN postcode ELSE NULL END ORDER BY translate(establishment_status_code::text, '1234', '1324'), urn desc) as row_number
+        FROM
+            establishments
+        WHERE
+            establishment_source_id = 1) e
+    WHERE
+        e.row_number = 1
+),
+unique_tps_establishments AS (
+    SELECT
+        tps_establishment_id,
+        la_code,
+        establishment_code,
+        employers_name,
+        school_gias_name,
+        school_closed_date
+    FROM
+        (SELECT
+            tps_establishment_id,
+            la_code,
+            establishment_code,
+            employers_name,
+            school_gias_name,
+            school_closed_date,
+            ROW_NUMBER() OVER (PARTITION BY la_code, establishment_code ORDER BY CASE WHEN school_closed_date IS NULL THEN 1 ELSE 2 END) as row_number
+         FROM
+            tps_establishments) e
+    WHERE
+        e.row_number = 1
+)
+SELECT
+	*
+FROM
+	unique_tps_establishments e
+WHERE
+	NOT EXISTS (SELECT
+					1
+				FROM
+					unique_gias_establishments g
+				WHERE
+					g.la_code = e.la_code
+					AND g.establishment_number = e.establishment_code)
+	AND NOT EXISTS (SELECT
+				   		1
+				    FROM
+				   		tps_establishment_types t
+					WHERE
+						e.establishment_code::int >= t.establishment_range_from::int
+                        AND e.establishment_code::int <= t.establishment_range_to::int)
+ORDER BY
+	la_code,
+	establishment_code
+```
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