[英]How to merge two rows into one row in sql?
I have a table as 我有一张桌子
EmployeeID IndividualPay FamilyPay IsActive
1 200 300 true
1 100 150 false
But I want the output as follows(I want to use this output to inner join with some other table) 但我希望输出如下(我想使用此输出与其他表的内连接)
EmployeeID IndPay_IsActive IndPay_IsNotActive FamilyPay_IsActive FamilyPay_IsNotActive
1 200 100 300 150
I have looked into PIVOT
, but not sure how to use it in my case. 我调查了PIVOT
,但不知道如何在我的情况下使用它。
This type of transformation is known as a pivot . 这种类型的转换称为枢轴 。 You did not specify what database you are using but you can use an aggregate function with a CASE
expression in any system: 您没有指定要使用的数据库,但可以在任何系统中使用带有CASE
表达式的聚合函数:
select employeeid,
max(case when IsActive = 'true' then IndividualPay end) IndPay_IsActive,
max(case when IsActive = 'false' then IndividualPay end) IndPay_IsNotActive,
max(case when IsActive = 'true' then FamilyPay end) FamilyPay_IsActive,
max(case when IsActive = 'false' then FamilyPay end) FamilyPay_IsNotActive
from yourtable
group by employeeid
See SQL Fiddle with Demo 请参阅SQL Fiddle with Demo
Depending on your database, if you have access to both the PIVOT
and UNPIVOT
functions, then they can be used to get the result. 根据您的数据库,如果您有权访问PIVOT
和UNPIVOT
函数,则可以使用它们来获取结果。 The UNPIVOT
function converts the IndividualPay
and FamilyPay
columns into rows. UNPIVOT
函数将IndividualPay
和FamilyPay
列转换为行。 Once that is done, then you can create the four new columns with the PIVOT
function: 完成后,您可以使用PIVOT
函数创建四个新列:
select *
from
(
select employeeid,
case when isactive = 'true'
then col+'_IsActive'
else col+'_IsNotActive' end col,
value
from yourtable
unpivot
(
value
for col in (IndividualPay, FamilyPay)
) unpiv
) src
pivot
(
max(value)
for col in (IndividualPay_IsActive, IndividualPay_IsNotActive,
FamilyPay_IsActive, FamilyPay_IsNotActive)
) piv
See SQL Fiddle with Demo . 请参阅SQL Fiddle with Demo 。
Both give the same result: 两者都给出相同的结果:
| EMPLOYEEID | INDIVIDUALPAY_ISACTIVE | INDIVIDUALPAY_ISNOTACTIVE | FAMILYPAY_ISACTIVE | FAMILYPAY_ISNOTACTIVE |
----------------------------------------------------------------------------------------------------------------
| 1 | 200 | 100 | 300 | 150 |
Select
EmployeeID,
Active.IndividualPay As IndPay_IsActive,
Active.FamilyPay As FamilyPay_IsActive,
Inactive.IndividualPay As IndPay_IsNotActive,
Inactive.FamilyPay As FamilyPay_IsNotActive
From
PayTable Active
Join PayTable Inactive On Active.EmployeeID = Inactive.EmployeeId
And Inactive.IsActive = 'false'
Where
Active.IsActive = 'true'
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