Question

我的数据是这样的（我附上了一张图片来显示数据和我想要的东西）

LoanNb  FullNm  Rule1   Rule2   Rule3   Rule4   …   Rule40  
100 A   Fatal   null    null    Warning     null    
200 A   null    null    Fatal   null        null    
300 B   null    Warning null    null        null    
400 C   null    null    null    null        null

我想要这样

LoanNb  FullNm  Rule Name   Outcome                 
100 A   Rule1       Critical                    
100 A   Rule4       Warning                 
200 A   Rule3       Critical                    
300 B   Rule2       Warning

我在论坛中搜索过，我想我需要做一些事情，我正在尝试这个，但是没有工作。我是SQL的新手。

select * 
From Tablename

Unpivot
(RuleOutcome for Rulename in ('Rule1', 'Rule2', 'Rule3', 'Rule4')
) unpiv

Answer 1

declare @t table(LoanNb int, FullNm varchar(1),Rule1 varchar(10),Rule2 varchar(10), Rule3 varchar(10),Rule4 varchar(10),rule5 varchar(10))
insert into @t values
(100, 'A', 'Fatal', null, null, 'Warning', null),
(200, 'A', null, null, 'Fatal', null, null),
(300, 'B', null, 'Warning',null, null, null),
(400, 'C', null, null ,null, null, null)

SELECT loannb, fullnm, rules
FROM 
   (SELECT fullnm,loannb, rule1,rule2,rule3,rule4
   FROM @t) p
UNPIVOT
   (rules FOR setofrules  IN (rule1,rule2,rule3,rule4)
)AS unpvt;

结果 loannb fullnm规则

    100 A      Fatal
    100 A      Warning
    200 A      Fatal
    300 B      Warning

（受影响的4行）

TSQL将列引入行，

1 个答案: