[英]Show data from same table in different column but in same row in MSSQL
Let I have tables as 让我有桌子
What I want to do is to select data like 我想要做的是选择数据
OUTPUT{ID,FirstName,LastName,SkillONE,SkillOneExp,SkillTwo,SkillTwoExp,SkillThree,SkillThreeExp}
here SkillOne will show most experienced skill (like java, C++), SkillOneExp is the year of exp of that skill and so on. 这里,SkillOne将显示最有经验的技能(例如Java,C ++),SkillOneExp是该技能的使用年份,依此类推。 Will show only 3 like this.
这样只会显示3个。 For each employee there will be only one row.
对于每位员工,只有一行。
I tried as 我尝试了
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
By using this I am not getting proper result. 通过使用此我不会得到适当的结果。 I am using MS SQL 2012.
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
by editing the query by @anon I solved my problem. 通过编辑@anon的查询,我解决了我的问题。 thanks a lot to him.
非常感谢他。
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
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