[英]Show data from same table in different column but in same row in MSSQL
讓我有桌子
我想要做的是選擇數據
OUTPUT{ID,FirstName,LastName,SkillONE,SkillOneExp,SkillTwo,SkillTwoExp,SkillThree,SkillThreeExp}
這里,SkillOne將顯示最有經驗的技能(例如Java,C ++),SkillOneExp是該技能的使用年份,依此類推。 這樣只會顯示3個。 對於每位員工,只有一行。
我嘗試了
select
e.ID
,e.FirstName
,e.LastName
,es.experience
,CAST
(
CASE
WHEN tf.rownumber = 1
THEN tf.skill_description
END
AS varchar(50)
)as SKILLONE
,CAST
(
CASE
WHEN tf.rownumber = 1
THEN tf.experience
END
AS varchar(50)
)as SKILLONE_EXP
,CAST
(
CASE
WHEN tf.rownumber = 2
THEN tf.skill_description
END
AS varchar(50)
)as SKILTWO
,CAST
(
CASE
WHEN tf.rownumber = 2
THEN tf.experience
END
AS varchar(50)
)as SKILLTWO_EXP
from
Employee e
JOIN
EmployeeSkill es
on es.ID=e.ID
JOIN
skills s
on s.skill_ID=es.skill_ID
JOIN
(
select * from
(
(select
ROW_NUMBER() OVER (ORDER BY es2.experience ASC) AS rownumber,
es2.ID
,es2.skill_ID
,es2.experience
,s2.skill_description
from
EmployeeSkill es2
JOIN
skills s2
on
s2.skill_ID=es2.skill_ID
)
) as tf2
)as tf
on tf.id= e.id
通過使用此我不會得到適當的結果。 我正在使用MS SQL 2012。
SELECT
emp.ID,
emp.FirstName,
emp.LastName,
MIN(CASE i WHEN 1 THEN ski.skill_description END) AS SkillOne ,
MIN(CASE i WHEN 1 THEN ski.experience END) AS SkillOneExp ,
MIN(CASE i WHEN 2 THEN ski.skill_description END) AS SkillTwo ,
MIN(CASE i WHEN 2 THEN ski.experience END) AS SkillTwoExp ,
MIN(CASE i WHEN 3 THEN ski.skill_description END) AS SkillThree ,
MIN(CASE i WHEN 3 THEN ski.experience END) AS SkillThreeExp
FROM
Employee AS emp
CROSS APPLY (
SELECT TOP 3
ROW_NUMBER() OVER(ORDER BY experience DESC) i,
CAST(skill_description AS varchar(50),
CAST(experience AS varchar(50)
FROM EmployeeSkill t1
INNER JOIN skills t2
ON (t1.skill_ID = t2.skill_ID)
ORDER BY experience DESC
) AS ski
GROUP BY
emp.ID,
emp.FirstName,
emp.LastName
通過編輯@anon的查詢,我解決了我的問題。 非常感謝他。
SELECT
emp.ID,
emp.FirstName,
emp.LastName,
MIN(CASE i WHEN 1 THEN ski.skill_description END) AS SkillOne ,
MIN(CASE i WHEN 1 THEN ski.experience END) AS SkillOneExp ,
MIN(CASE i WHEN 2 THEN ski.skill_description END) AS SkillTwo ,
MIN(CASE i WHEN 2 THEN ski.experience END) AS SkillTwoExp ,
MIN(CASE i WHEN 3 THEN ski.skill_description END) AS SkillThree ,
MIN(CASE i WHEN 3 THEN ski.experience END) AS SkillThreeExp
FROM
Employee AS emp
CROSS APPLY (
SELECT TOP 3
ROW_NUMBER() OVER(ORDER BY experience DESC) i,
CAST(skill_description AS varchar(50) ) AS skill_description,
CAST(experience AS varchar(50) ) AS experience
FROM EmployeeSkill t1
INNER JOIN skills t2
ON (t1.skill_ID = t2.skill_ID) AND t1.ID=emp.ID
ORDER BY experience DESC
) AS ski
GROUP BY
emp.ID,
emp.FirstName,
emp.LastName
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.