有這樣一個(gè)表,主鍵為 10001 的員工有17條年薪數(shù)據(jù)?,F(xiàn)在我的需求是這樣的,就是用 SQL 語句輸出這樣的格式:
emp_no | from_date | to_date | salary | 差額 |
---|---|---|---|---|
10001 | 1986-06-26 | 1987-06-26 | 60117 | 上一年的年薪減去今年年薪的差額 |
10001 | 1987-06-26 | 1988-06-25 | 62102 | 上一年的年薪減去今年年薪的差額 |
10001 | 1988-06-25 | 1989-06-25 | 66074 | 上一年的年薪減去今年年薪的差額 |
......... | ......... | ......... | ......... | ......... |
........ | ......... | ......... | ......... | ......... |
......... | ......... | ......... | ......... | ......... |
更進(jìn)一步的需求,以 一行(記住是一行) 的格式顯示,輸出格式如下:
emp_no | from_date | to_date | salary | 差額 | from_date | to_date | salary | 差額 | from_date | to_date | salary | 差額 | ... | ... | ... | ... |
---|
這是數(shù)據(jù)庫的地址,有心幫忙的朋友可以直接在數(shù)據(jù)庫上進(jìn)行測試。
host:125.42.176.217:63306
user:ousikongjian
password: hawk@#
database: employees
table: salaries
類似于這樣的:
CREATE TABLE tt_test (id INT DEFAULT 0, CODE INT DEFAULT 0, from_tm DATETIME, to_tm DATETIME, salary INT);
SELECT tt.code,
'2005-03-07' AS from_tm, '2006-03-07' AS to_tm,
MAX(CASE WHEN tt.from_tm = '2005-03-07' THEN tt.salary END) AS salary,
MAX(CASE WHEN tt.from_tm = '2005-03-07' THEN tt.s END) AS '差額',
'2006-03-07' AS from_tm, '2007-03-07' AS to_tm,
MAX(CASE WHEN tt.from_tm = '2006-03-07' THEN tt.salary END) AS salary,
MAX(CASE WHEN tt.from_tm = '2006-03-07' THEN tt.s END) AS '差額',
'2007-03-07' AS from_tm, '2008-03-07' AS to_tm,
MAX(CASE WHEN tt.from_tm = '2007-03-07' THEN tt.salary END) AS salary,
MAX(CASE WHEN tt.from_tm = '2007-03-07' THEN tt.s END) AS '差額',
'2008-03-07' AS from_tm, '2009-03-07' AS to_tm,
MAX(CASE WHEN tt.from_tm = '2008-03-07' THEN tt.salary END) AS salary,
MAX(CASE WHEN tt.from_tm = '2008-03-07' THEN tt.s END) AS '差額',
'2009-03-07' AS from_tm, '2010-03-07' AS to_tm,
MAX(CASE WHEN tt.from_tm = '2009-03-07' THEN tt.salary END) AS salary,
MAX(CASE WHEN tt.from_tm = '2009-03-07' THEN tt.s END) AS '差額',
'2010-03-07' AS from_tm, '2011-03-07' AS to_tm,
MAX(CASE WHEN tt.from_tm = '2010-03-07' THEN tt.salary END) AS salary,
MAX(CASE WHEN tt.from_tm = '2010-03-07' THEN tt.s END) AS '差額'
FROM (
SELECT
t.code, DATE_FORMAT(t.from_tm, '%Y-%m-%d') AS from_tm, DATE_FORMAT(t.to_tm, '%Y-%m-%d') AS to_tm,
t.salary,
CASE
WHEN @s IS NULL OR @c != t.code
THEN t.salary
ELSE t.salary - @s
END AS s,
CASE
WHEN @c != t.code
THEN @s := 0
ELSE @s
END AS cx,
@s := t.salary,
@c := t.code
FROM
(SELECT
@s := 0) r,
(SELECT
@c := '') c,
tt_test t
ORDER BY t.code,
t.from_tm ) tt
GROUP BY tt.code ;
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('2','0','2018-03-07 10:14:08','2017-03-07 10:14:20','1000');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('3','0','2017-03-07 10:14:08','2016-03-07 10:14:20','1005');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('4','0','2016-03-07 10:14:08','2015-03-07 10:14:20','1100');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('5','0','2015-03-07 10:14:08','2014-03-07 10:14:20','905');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('6','0','2014-03-07 10:14:08','2013-03-07 10:14:20','987');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('7','0','2013-03-07 10:14:08','2012-03-07 10:14:20','950');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('8','0','2012-03-07 10:14:08','2011-03-07 10:14:20','997');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('9','0','2011-03-07 10:14:08','2010-03-07 10:14:20','900');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('10','0','2009-03-07 10:14:08','2008-03-07 10:14:20','890');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('11','0','2008-03-07 10:14:08','2007-03-07 10:14:20','800');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('12','0','2007-03-07 10:14:08','2006-03-07 10:14:20','850');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('13','0','2006-03-07 10:14:08','2005-03-07 10:14:20','843');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('14','1','2018-03-07 10:14:08','2017-03-07 10:14:20','1255');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('15','1','2017-03-07 10:14:08','2016-03-07 10:14:20','1224');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('16','1','2016-03-07 10:14:08','2015-03-07 10:14:20','1324');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('17','1','2015-03-07 10:14:08','2014-03-07 10:14:20','1122');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('18','1','2014-03-07 10:14:08','2013-03-07 10:14:20','1025');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('19','1','2013-03-07 10:14:08','2012-03-07 10:14:20','997');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('20','1','2012-03-07 10:14:08','2011-03-07 10:14:20','897');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('21','1','2011-03-07 10:14:08','2010-03-07 10:14:20','927');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('22','1','2010-03-07 10:14:08','2009-03-07 10:14:20','995');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('23','1','2009-03-07 10:14:08','2008-03-07 10:14:20','901');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('24','1','2008-03-07 10:14:08','2007-03-07 10:14:20','923');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('25','1','2007-03-07 10:14:08','2006-03-07 10:14:20','899');
INSERT INTO tt_test
(id
, code
, to_tm
, from_tm
, salary
) VALUES('26','1','2006-03-07 10:14:08','2005-03-07 10:14:20','887');
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