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drop table if exists t1,t2;
create table t1 (product varchar(32), country_id int not null, year int, profit int);
insert into t1 values ( 'Computer', 2,2000, 1200),
( 'TV', 1, 1999, 150),
( 'Calculator', 1, 1999,50),
( 'Computer', 1, 1999,1500),
( 'Computer', 1, 2000,1500),
( 'TV', 1, 2000, 150),
( 'TV', 2, 2000, 100),
( 'TV', 2, 2000, 100),
( 'Calculator', 1, 2000,75),
( 'Calculator', 2, 2000,75),
( 'TV', 1, 1999, 100),
( 'Computer', 1, 1999,1200),
( 'Computer', 2, 2000,1500),
( 'Calculator', 2, 2000,75),
( 'Phone', 3, 2003,10)
;
create table t2 (country_id int primary key, country char(20) not null);
insert into t2 values (1, 'USA'),(2,'India'), (3,'Finland');
select product, sum(profit) from t1 group by product;
product sum(profit)
Calculator 275
Computer 6900
Phone 10
TV 600
select product, sum(profit) from t1 group by product with rollup;
product sum(profit)
Calculator 275
Computer 6900
Phone 10
TV 600
NULL 7785
select product, sum(profit) from t1 group by 1 with rollup;
product sum(profit)
Calculator 275
Computer 6900
Phone 10
TV 600
NULL 7785
select product, sum(profit),avg(profit) from t1 group by product with rollup;
product sum(profit) avg(profit)
Calculator 275 68.7500
Computer 6900 1380.0000
Phone 10 10.0000
TV 600 120.0000
NULL 7785 519.0000
select product, country_id , year, sum(profit) from t1 group by product, country_id, year;
product country_id year sum(profit)
Calculator 1 1999 50
Calculator 1 2000 75
Calculator 2 2000 150
Computer 1 1999 2700
Computer 1 2000 1500
Computer 2 2000 2700
Phone 3 2003 10
TV 1 1999 250
TV 1 2000 150
TV 2 2000 200
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup;
product country_id year sum(profit)
Calculator 1 1999 50
Calculator 1 2000 75
Calculator 1 NULL 125
Calculator 2 2000 150
Calculator 2 NULL 150
Calculator NULL NULL 275
Computer 1 1999 2700
Computer 1 2000 1500
Computer 1 NULL 4200
Computer 2 2000 2700
Computer 2 NULL 2700
Computer NULL NULL 6900
Phone 3 2003 10
Phone 3 NULL 10
Phone NULL NULL 10
TV 1 1999 250
TV 1 2000 150
TV 1 NULL 400
TV 2 2000 200
TV 2 NULL 200
TV NULL NULL 600
NULL NULL NULL 7785
explain extended select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 15 Using temporary; Using filesort
Warnings:
Note 1003 select `test`.`t1`.`product` AS `product`,`test`.`t1`.`country_id` AS `country_id`,`test`.`t1`.`year` AS `year`,sum(`test`.`t1`.`profit`) AS `sum(profit)` from `test`.`t1` group by `test`.`t1`.`product`,`test`.`t1`.`country_id`,`test`.`t1`.`year` with rollup
select product, country_id , sum(profit) from t1 group by product desc, country_id with rollup;
product country_id sum(profit)
TV 1 400
TV 2 200
TV NULL 600
Phone 3 10
Phone NULL 10
Computer 1 4200
Computer 2 2700
Computer NULL 6900
Calculator 1 125
Calculator 2 150
Calculator NULL 275
NULL NULL 7785
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup limit 5;
product country_id year sum(profit)
Calculator 1 1999 50
Calculator 1 2000 75
Calculator 1 NULL 125
Calculator 2 2000 150
Calculator 2 NULL 150
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup limit 3,3;
product country_id year sum(profit)
Calculator 2 2000 150
Calculator 2 NULL 150
Calculator NULL NULL 275
select product, country_id, count(*), count(distinct year) from t1 group by product, country_id;
product country_id count(*) count(distinct year)
Calculator 1 2 2
Calculator 2 2 1
Computer 1 3 2
Computer 2 2 1
Phone 3 1 1
TV 1 3 2
TV 2 2 1
select product, country_id, count(*), count(distinct year) from t1 group by product, country_id with rollup;
product country_id count(*) count(distinct year)
Calculator 1 2 2
Calculator 2 2 1
Calculator NULL 4 2
Computer 1 3 2
Computer 2 2 1
Computer NULL 5 2
Phone 3 1 1
Phone NULL 1 1
TV 1 3 2
TV 2 2 1
TV NULL 5 2
NULL NULL 15 3
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup having country_id = 1;
product country_id year sum(profit)
Calculator 1 1999 50
Calculator 1 2000 75
Calculator 1 NULL 125
Computer 1 1999 2700
Computer 1 2000 1500
Computer 1 NULL 4200
TV 1 1999 250
TV 1 2000 150
TV 1 NULL 400
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup having sum(profit) > 200;
product country_id year sum(profit)
Calculator NULL NULL 275
Computer 1 1999 2700
Computer 1 2000 1500
Computer 1 NULL 4200
Computer 2 2000 2700
Computer 2 NULL 2700
Computer NULL NULL 6900
TV 1 1999 250
TV 1 NULL 400
TV NULL NULL 600
NULL NULL NULL 7785
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup having sum(profit) > 7000;
product country_id year sum(profit)
NULL NULL NULL 7785
select concat(product,':',country_id) as 'prod', concat(":",year,":") as 'year',1+1, sum(profit)/count(*) from t1 group by 1,2 with rollup;
prod year 1+1 sum(profit)/count(*)
Calculator:1 :1999: 2 50.00000
Calculator:1 :2000: 2 75.00000
Calculator:1 NULL 2 62.50000
Calculator:2 :2000: 2 75.00000
Calculator:2 NULL 2 75.00000
Computer:1 :1999: 2 1350.00000
Computer:1 :2000: 2 1500.00000
Computer:1 NULL 2 1400.00000
Computer:2 :2000: 2 1350.00000
Computer:2 NULL 2 1350.00000
Phone:3 :2003: 2 10.00000
Phone:3 NULL 2 10.00000
TV:1 :1999: 2 125.00000
TV:1 :2000: 2 150.00000
TV:1 NULL 2 133.33333
TV:2 :2000: 2 100.00000
TV:2 NULL 2 100.00000
NULL NULL 2 519.00000
select product, sum(profit)/count(*) from t1 group by product with rollup;
product sum(profit)/count(*)
Calculator 68.75000
Computer 1380.00000
Phone 10.00000
TV 120.00000
NULL 519.00000
select left(product,4) as prod, sum(profit)/count(*) from t1 group by prod with rollup;
prod sum(profit)/count(*)
Calc 68.75000
Comp 1380.00000
Phon 10.00000
TV 120.00000
NULL 519.00000
select concat(product,':',country_id), 1+1, sum(profit)/count(*) from t1 group by concat(product,':',country_id) with rollup;
concat(product,':',country_id) 1+1 sum(profit)/count(*)
Calculator:1 2 62.50000
Calculator:2 2 75.00000
Computer:1 2 1400.00000
Computer:2 2 1350.00000
Phone:3 2 10.00000
TV:1 2 133.33333
TV:2 2 100.00000
NULL 2 519.00000
select product, country , year, sum(profit) from t1,t2 where t1.country_id=t2.country_id group by product, country, year with rollup;
product country year sum(profit)
Calculator India 2000 150
Calculator India NULL 150
Calculator USA 1999 50
Calculator USA 2000 75
Calculator USA NULL 125
Calculator NULL NULL 275
Computer India 2000 2700
Computer India NULL 2700
Computer USA 1999 2700
Computer USA 2000 1500
Computer USA NULL 4200
Computer NULL NULL 6900
Phone Finland 2003 10
Phone Finland NULL 10
Phone NULL NULL 10
TV India 2000 200
TV India NULL 200
TV USA 1999 250
TV USA 2000 150
TV USA NULL 400
TV NULL NULL 600
NULL NULL NULL 7785
select product, `sum` from (select product, sum(profit) as 'sum' from t1 group by product with rollup) as tmp where product is null;
product sum
NULL 7785
select product from t1 where exists (select product, country_id , sum(profit) from t1 as t2 where t1.product=t2.product group by product, country_id with rollup having sum(profit) > 6000);
product
Computer
Computer
Computer
Computer
Computer
select product, country_id , year, sum(profit) from t1 group by product, country_id, year having country_id is NULL;
product country_id year sum(profit)
select concat(':',product,':'), sum(profit),avg(profit) from t1 group by product with rollup;
concat(':',product,':') sum(profit) avg(profit)
:Calculator: 275 68.7500
:Computer: 6900 1380.0000
:Phone: 10 10.0000
:TV: 600 120.0000
:TV: 7785 519.0000
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with cube;
ERROR 42000: This version of MySQL doesn't yet support 'CUBE'
explain select product, country_id , year, sum(profit) from t1 group by product, country_id, year with cube;
ERROR 42000: This version of MySQL doesn't yet support 'CUBE'
select product, country_id , year, sum(profit) from t1 group by product, country_id, year with cube union all select product, country_id , year, sum(profit) from t1 group by product, country_id, year with rollup;
ERROR 42000: This version of MySQL doesn't yet support 'CUBE'
drop table t1,t2;
CREATE TABLE t1 (i int);
INSERT INTO t1 VALUES(100);
CREATE TABLE t2 (i int);
INSERT INTO t2 VALUES (100),(200);
SELECT i, COUNT(*) FROM t1 GROUP BY i WITH ROLLUP;
i COUNT(*)
100 1
NULL 1
SELECT t1.i, t2.i, COUNT(*) FROM t1,t2 GROUP BY t1.i,t2.i WITH ROLLUP;
i i COUNT(*)
100 100 1
100 200 1
100 NULL 2
NULL NULL 2
drop table t1,t2;
CREATE TABLE user_day(
user_id INT NOT NULL,
date DATE NOT NULL,
UNIQUE INDEX user_date (user_id, date)
);
INSERT INTO user_day VALUES
(1, '2004-06-06' ),
(1, '2004-06-07' ),
(2, '2004-06-06' );
SELECT
d.date AS day,
COUNT(d.user_id) as sample,
COUNT(next_day.user_id) AS not_cancelled
FROM user_day d
LEFT JOIN user_day next_day
ON next_day.user_id=d.user_id AND
next_day.date= DATE_ADD( d.date, interval 1 day )
GROUP BY day;
day sample not_cancelled
2004-06-06 2 1
2004-06-07 1 0
SELECT
d.date AS day,
COUNT(d.user_id) as sample,
COUNT(next_day.user_id) AS not_cancelled
FROM user_day d
LEFT JOIN user_day next_day
ON next_day.user_id=d.user_id AND
next_day.date= DATE_ADD( d.date, interval 1 day )
GROUP BY day
WITH ROLLUP;
day sample not_cancelled
2004-06-06 2 1
2004-06-07 1 0
NULL 3 1
DROP TABLE user_day;
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