我被困在为以下情况创建SQL的情况下

Question

我试过使用Case-End但没有任何工作。

DIFF类型的电话号码是：

1. 首页
2. 细胞
3. 主要
4. OTPR
5. BUSN

Answer 1

select emplid, 
max(case when phone_type='home' then phone_number else -1 end) Home, 
max(case when phone_type='cell' then phone_number else -1 end) Cell, 
..... 
from phone_data 
group by emplid; 

您不能混用字符和NU meric在一个字段中，如果您在输出中需要n/a，则需要使电话号码列字符变为另一个步骤。

Answer 2

试试这个SQL查询！

DECLARE @cols AS NVARCHAR(MAX),@query AS NVARCHAR(MAX); 

SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.phone_type) 
      FROM youtablename c 
      FOR XML PATH(''), TYPE 
      ).value('.', 'NVARCHAR(MAX)') 
     ,1,1,'') 

set @query = 'SELECT empid, ' + @cols + ' from 
      (
       select empid 
        , phone_number 
        , phone_type 
       from youtablename 
      ) x 
      pivot 
      (
       max(phone_number) 
       for phone_type in (' + @cols + ') 
      ) p ' 

execute(@query) 

Answer 3

select t.empid as empid, cell.phone_number as cell, home.phone_number as Home 
from telephones t 
inner join telephones cell on t.empid = cell.empid 
inner join telephones home on t.empid = home.empid 
where cell.Phone_type = "cell" 
and home.Phone_type = "home" 
group by t.empid 

和一个SQL小提琴：http://sqlfiddle.com/#!2/6bb17/11