SQL PASS BAC - 60 reporting tips in 60 minutes

Editor's Notes

• #18: update sales.customers set contacttitle = null where custid in ('59', '66', '78', '15') use tsql2012 select * from sales.customers select ContactName + ' - ' + ContactTitle + ', ' + City as GreetingLine from sales.customers select isnull(ContactName, '') + ' - ' + isnull(ContactTitle, '') + ', ' + isnull(City, '') as GreetingLine from sales.customers select concat(ContactName, ' ', ContactTitle, ' ', City) as GreetingLine from sales.customers
• #24: use tsql2012 select * from sales.orders select custid, freight from sales.orders select custid, freight, sum(freight) as totalFreight from sales.orders select custid, sum(freight) as totalFreight from sales.orders group by custid select custid, freight, sum(freight) as totalFreight from sales.orders group by custid select custid, freight, sum(freight) as totalFreight from sales.orders group by custid, freight --we're skipping subqueries, because they look ugly and --it insults me aesthetically ;with FreightTotal as ( select custid, sum(freight) as totalFreight from sales.orders group by custid ) select o.custid , o.freight , ft.totalFreight as totalFreight from sales.orders o join FreightTotal ft on o.custid = ft.custid --BIG IMPROVEMENT --query can be executed independantly --Can be reused, like this ;with FreightTotal as ( select custid, sum(freight) as totalFreight from sales.orders group by custid ) select o.custid , o.freight , ft.totalFreight as totalFreight , o.freight /ft.totalfreight * 100 as FreightPercentage from sales.orders o join FreightTotal ft on o.custid = ft.custid --but remember our original thought process select custid, freight, sum(freight) as totalFreight from sales.orders --here's a windowing function select custid , freight , sum(freight) over (partition by custid) as totalFreight from sales.orders --and reusing it is not that big of a deal select custid , freight , sum(freight) over (partition by custid) as totalFreight , freight / sum(freight) over (partition by custid) * 100 as FreightPercentage from sales.orders
• #26: SELECT * FROM (SELECT urgency, name, phone, location, department, cc, status, case_manager, ip, case_manager_ei d, id_problem, id_problem_type, eid_author, title, body, date_created, date_modified FROM problems AS main INNER JOIN (SELECT id_problem as t_urgency_id_problem, node_value AS urgency FROM problem_nodes WHERE node_name = "urgency")t_urgency ON t_urgency.t_urgency_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_name_id_problem, node_value AS name FROM problem_nodes WHERE node_name = "name")t_name ON t_name.t_name_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_phone_id_problem, node_value AS phone FROM problem_nodes WHERE node_name = "phone")t_phone ON t_phone.t_phone_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_location_id_problem, node_value AS location FROM problem_nodes WHERE node_name = "location")t_location ON t_location.t_location_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_department_id_problem, node_value AS department FROM problem_nodes WHERE node_name = "department")t_department ON t_department.t_department_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_cc_id_problem, node_value AS cc FROM problem_nodes WHERE node_name = "cc")t_cc ON t_cc.t_cc_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_status_id_problem, node_value AS status FROM problem_nodes WHERE node_name = "status")t_status ON t_status.t_status_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_case_manager_id_problem, node_value AS case_manager FROM problem_nodes WHERE node_name = "case_manager")t_case_manager ON t_case_manager.t_case_manager_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_ip_id_problem, node_value AS ip FROM problem_nodes WHERE node_name = "ip")t_ip ON t_ip.t_ip_id_problem = main.id_problem INNER JOIN (SELECT id_problem as t_case_manager_eid_id_problem, node_value AS case_manager_eid FROM problem_nodes WHERE node_name = "case_manager_eid") t_case_manager_eid ON t_case_manager_eid.t_case_manager_eid_id_problem = main.id_problem)t
• #29: ;with FirstMondays as ( Select DateAdd(day, (9-DatePart(weekday, DateAdd(Month, 1+DateDiff(Month, 0, '12/1/2009'), 0)))%7, DateAdd(Month, 1+DateDiff(Month, 0, '12/1/2009'), 0)) as FirstMonday union all select DateAdd(day, (9-DatePart(weekday, DateAdd(Month, 1+DateDiff(Month, 0, FirstMonday), 0)))%7, DateAdd(Month, 1+DateDiff(Month, 0, FirstMonday), 0)) from FirstMondays where firstMonday <= '12/1/2010' ) select * from FirstMondays use adventureworksdw2012 select EnglishMonthName, min(datekey) from dimdate where englishdaynameofweek = 'monday' and calendaryear = '2010' group by EnglishMonthName, MonthNumberOfYear order by MonthNumberOfYear
• #31: create table t1 (col1 varchar(100)) insert into t1 (col1) values ('1') ,('2') ,('3') ,('ike') ,('1') ,('2') ,('3') ,('ike') , ('1') ,('2') ,('3') ,('ike') select cast(col1 as int) from t1 select try_cast(col1 as int) from t1
• #32: SELECT SQL#.Date_Format('2009-12-03 12:45:56.345', 'D', '') -- Thursday, December 03, 2009 SELECT SQL#.Date_Format('2009-12-03 12:45:56.345', 'D', 'de') SELECT SQL#.Date_Format('2009-12-03 12:45:56.345', 'D', 'fr-fr') -- jeudi 3 décembre 2009 SELECT SQL#.Date_Format('2009-12-03 12:45:56.345', 'dd', '') -- 03 SELECT SQL#.Date_Format('2009-12-03 12:45:56.345', 'dd-MMM', '') SELECT SQL#.Date_Format('2009-12-03 12:45:56.345', 'tt', 'ja-jp') -- 午後 SELECT SQL#.Math_IsPrime(12318237133333)
• #64: SELECT * FROM sales.Customers WHERE custid = <custid, int, 0> SELECT * FROM sales.customers c JOIN sales.orders o ON c.custid = o.custid WHERE c.custid = <custid, int, 0> AND o.orderdate > <orderdate, datetime, '1/1/2015'>