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| Original file line number | Diff line number | Diff line change |
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| @@ -1,4 +1,4 @@ | ||
| -- Active: 1688066368502@@pg-db@5432@sfpolice | ||
| -- Active: 1688066368502@@pg-db@5432@hr | ||
| -- get the data from the below link | ||
| -- https://data.sfgov.org/Public-Safety/Police-Department-Incident-Reports-Historical-2003/tmnf-yvry/data | ||
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@@ -9,7 +9,7 @@ | |
| SELECT COUNT(DISTINCT pddistrict) FROM police_incident_reports; | ||
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| -- How many neighborhoods are there? | ||
| SELECT COUNT(DISTINCT "Neighborhoods 2") FROM police_incident_reports; | ||
| SELECT COUNT(DISTINCT 'Neighborhoods 2") FROM police_incident_reports; | ||
| -- How many incidents by neighborhood? | ||
| SELECT "Neighborhoods 2", COUNT(*) AS COUNT FROM police_incident_reports GROUP BY "Neighborhoods 2" order by COUNT(*); -- Try to visualize in pgadmin | ||
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@@ -92,4 +92,154 @@ select *, count(incidentnum) over() from police_incident_reports | |
| Select category, pddistrict, descript, count(incidentnum) over() from police_incident_reports | ||
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| -- change the scope of the window to the category alone | ||
| Select category, pddistrict, descript, count(incidentnum) over(partition by category) from police_incident_reports | ||
| Select category, pddistrict, descript, count(incidentnum) over(partition by category) from police_incident_reports | ||
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| -- if you would like to get the equivalent to Group By | ||
| Select category, count(incidentnum) over(partition by category) from police_incident_reports -- this will list all rows with the count without flattening the rows | ||
| -- You must add DISTINCT statement to the above to get the equivalent to Group By | ||
| Select DISTINCT category, count(incidentnum) over(partition by category) from police_incident_reports | ||
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| -- row_number() | ||
| -- return a unique number for each row | ||
| select *, row_number() over() from police_incident_reports | ||
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| -- you can create different windows by spcifying a partition | ||
| select category, pddistrict, date, row_number() over(partition by category) from police_incident_reports | ||
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| -- order the window to change the row number | ||
| select category, pddistrict, date, row_number() over(partition by category order by date) from police_incident_reports | ||
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| -- show the first 2 incidents by category and pddistrict | ||
| -- use subquery | ||
| select * from ( | ||
| select category, pddistrict, date, (row_number() over(partition by category order by date)) as rn from police_incident_reports | ||
| ) x | ||
| where x.rn < 3 | ||
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| -- rank() | ||
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| select category, pddistrict, rank() over(partition by "Incident Code" order by pddistrict) from police_incident_reports | ||
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| -- dense_rank() | ||
| select category, pddistrict, dense_rank() over(partition by "Incident Code" order by pddistrict) from police_incident_reports | ||
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| -- as another example create a new database and table | ||
| create database hr; | ||
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| -- create and populate employee table | ||
| CREATE TABLE employees ( | ||
| employee_id INT, | ||
| first_name VARCHAR (20) DEFAULT NULL, | ||
| last_name VARCHAR (25) NOT NULL, | ||
| email VARCHAR (100) NOT NULL, | ||
| phone_number VARCHAR (20) DEFAULT NULL, | ||
| hire_date DATE NOT NULL, | ||
| job_id INT NOT NULL, | ||
| salary DECIMAL (8, 2) NOT NULL, | ||
| manager_id INT DEFAULT NULL, | ||
| department_id VARCHAR (25) DEFAULT NULL | ||
| ); | ||
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| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (100,'Steven','King','[email protected]','515.123.4567','1987-06-17',4,24000.00,NULL,'Executive'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (101,'Neena','Kochhar','[email protected]','515.123.4568','1989-09-21',5,17000.00,100,'Executive'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (102,'Lex','De Haan','lex.de [email protected]','515.123.4569','1993-01-13',5,17000.00,100,'Executive'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (103,'Alexander','Hunold','[email protected]','590.423.4567','1990-01-03',9,9000.00,102,'IT'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (104,'Bruce','Ernst','[email protected]','590.423.4568','1991-05-21',9,6000.00,103,'IT'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (105,'David','Austin','[email protected]','590.423.4569','1997-06-25',9,4800.00,103,'IT'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (106,'Valli','Pataballa','[email protected]','590.423.4560','1998-02-05',9,4800.00,103,'IT'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (107,'Diana','Lorentz','[email protected]','590.423.5567','1999-02-07',9,4200.00,103,'IT'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (108,'Nancy','Greenberg','[email protected]','515.124.4569','1994-08-17',7,12000.00,101,'Finance'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (109,'Daniel','Faviet','[email protected]','515.124.4169','1994-08-16',6,9000.00,108,'Finance'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (110,'John','Chen','[email protected]','515.124.4269','1997-09-28',6,8200.00,108,'Finance'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (111,'Ismael','Sciarra','[email protected]','515.124.4369','1997-09-30',6,7700.00,108,'Finance'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (112,'Jose Manuel','Urman','jose [email protected]','515.124.4469','1998-03-07',6,7800.00,108,'Finance'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (113,'Luis','Popp','[email protected]','515.124.4567','1999-12-07',6,6900.00,108,'Finance'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (114,'Den','Raphaely','[email protected]','515.127.4561','1994-12-07',14,11000.00,100,'Administration Assistant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (115,'Alexander','Khoo','[email protected]','515.127.4562','1995-05-18',13,3100.00,114, 'Administration Assistant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (116,'Shelli','Baida','[email protected]','515.127.4563','1997-12-24',13,2900.00,114,'Administration Assistant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (117,'Sigal','Tobias','[email protected]','515.127.4564','1997-07-24',13,2800.00,114,'Administration Assistant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (118,'Guy','Himuro','[email protected]','515.127.4565','1998-11-15',13,2600.00,114,'Administration Assistant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (119,'Karen','Colmenares','[email protected]','515.127.4566','1999-08-10',13,2500.00,114,'Administration Assistant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (120,'Matthew','Weiss','[email protected]','650.123.1234','1996-07-18',19,8000.00,100,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (121,'Adam','Fripp','[email protected]','650.123.2234','1997-04-10',19,8200.00,100,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (122,'Payam','Kaufling','[email protected]','650.123.3234','1995-05-01',19,7900.00,100,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (123,'Shanta','Vollman','[email protected]','650.123.4234','1997-10-10',19,6500.00,100,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (126,'Irene','Mikkilineni','[email protected]','650.124.1224','1998-09-28',18,2700.00,120,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (145,'John','Russell','[email protected]',NULL,'1996-10-01',15,14000.00,100,'Sales'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (146,'Karen','Partners','[email protected]',NULL,'1997-01-05',15,13500.00,100,'Sales'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (176,'Jonathon','Taylor','[email protected]',NULL,'1998-03-24',16,8600.00,100,'Sales'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (177,'Jack','Livingston','[email protected]',NULL,'1998-04-23',16,8400.00,100,'Sales'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (178,'Kimberely','Grant','[email protected]',NULL,'1999-05-24',16,7000.00,100,'Sales'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (179,'Charles','Johnson','[email protected]',NULL,'2000-01-04',16,6200.00,100,'Sales'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (192,'Sarah','Bell','[email protected]','650.501.1876','1996-02-04',17,4000.00,123,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (193,'Britney','Everett','[email protected]','650.501.2876','1997-03-03',17,3900.00,123,'Shipping'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (200,'Jennifer','Whalen','[email protected]','515.123.4444','1987-09-17',3,4400.00,101,'Public Accountant'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (201,'Michael','Hartstein','[email protected]','515.123.5555','1996-02-17',10,13000.00,100,'Accounting Manager'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (202,'Pat','Fay','[email protected]','603.123.6666','1997-08-17',11,6000.00,201,'Accounting Manager'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (203,'Susan','Mavris','[email protected]','515.123.7777','1994-06-07',8,6500.00,101,'President'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (204,'Hermann','Baer','[email protected]','515.123.8888','1994-06-07',12,10000.00,101,'Public Relations'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (205,'Shelley','Higgins','[email protected]','515.123.8080','1994-06-07',2,12000.00,101,'Accounting'); | ||
| INSERT INTO employees(employee_id,first_name,last_name,email,phone_number,hire_date,job_id,salary,manager_id,department_id) VALUES (206,'William','Gietz','[email protected]','515.123.8181','1994-06-07',1,8300.00,205,'Accounting'); | ||
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| ------- | ||
| -- rank() and dense_rank() | ||
| ------- | ||
| SELECT | ||
| first_name, | ||
| last_name, | ||
| department_id, | ||
| salary, | ||
| RANK() OVER(partition by department_id ORDER BY salary DESC) rank | ||
| FROM | ||
| employees; | ||
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| SELECT | ||
| first_name, | ||
| last_name, | ||
| department_id, | ||
| salary, | ||
| RANK() OVER(partition by department_id ORDER BY salary DESC) rank, | ||
| DENSE_RANK() OVER(partition by department_id ORDER BY salary DESC) dense_rank | ||
| FROM | ||
| employees; | ||
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| -- lead() and lag() | ||
| SELECT | ||
| first_name, | ||
| last_name, | ||
| department_id, | ||
| salary, | ||
| LAG(salary, 1) OVER(partition by department_id ORDER BY salary DESC) lag, | ||
| salary - LAG(salary, 1) OVER(partition by department_id ORDER BY salary DESC) diff | ||
| FROM | ||
| employees; | ||
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| SELECT | ||
| first_name, | ||
| last_name, | ||
| department_id, | ||
| salary, | ||
| LEAD(salary, 1) OVER(partition by department_id ORDER BY salary DESC) lead, | ||
| salary - LEAD(salary, 1) OVER(partition by department_id ORDER BY salary DESC) diff | ||
| FROM | ||
| employees; | ||
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| -- ntile() | ||
| SELECT | ||
| first_name, | ||
| last_name, | ||
| department_id, | ||
| salary, | ||
| NTILE(4) OVER(partition by department_id ORDER BY salary) quartile | ||
| FROM | ||
| employees | ||
| ORDER BY | ||
| department_id, | ||
| quartile; | ||