如何使用SQL将单行拆分为多行

Question

My T-SQL code selects information concerning college debt amounts from a table. The code itself works, but I need to break the single row up. There are 4 rows, one for each debt level. I'm probably missing something simple at this point.

USE [College Database]
GO


DECLARE @P10W FLOAT, @P25W FLOAT, @P75W FLOAT, @P90W FLOAT, @P10A FLOAT, @P25A FLOAT, @P75A FLOAT, @P90A FLOAT

SELECT  @P10W = CONVERT(DECIMAL(6,0),SUM(CUML_DEBT_P10*CUML_DEBT_N)/SUM(CUML_DEBT_N)),
@P25W = CONVERT(DECIMAL(6,0),SUM(CUML_DEBT_P25*CUML_DEBT_N)/SUM(CUML_DEBT_N)),
@P75W = CONVERT(DECIMAL(6,0),SUM(CUML_DEBT_P75*CUML_DEBT_N)/SUM(CUML_DEBT_N)),
@P90W = CONVERT(DECIMAL(6,0),SUM(CUML_DEBT_P90*CUML_DEBT_N)/SUM(CUML_DEBT_N))
FROM CollegeInfo

SELECT 
@P10A = CONVERT(DECIMAL(6,0),AVG(CUML_DEBT_P10)),
@P25A = CONVERT(DECIMAL(6,0),AVG(CUML_DEBT_P25)),
@P75A = CONVERT(DECIMAL(6,0),AVG(CUML_DEBT_P75)),
@P90A = CONVERT(DECIMAL(6,0),AVG(CUML_DEBT_P90))
From CollegeInfo

SELECT  '10%  Debt Level', 
CUML_DEBT_P10 AS 'Institution',
@P10A AS 'Average',
@P10W AS ' Weighted Average' ,
'25%  Debt Level', 
 CUML_DEBT_P25 AS 'Institution',
 @P25A AS 'Average',
 @P25W AS ' Weighted Average' ,  
 '75%  Debt Level', 
 CUML_DEBT_P75 AS 'Institution',
 @P75A AS 'Average',
 @P75W AS ' Weighted Average' ,
 '90%  Debt Level', 
 CUML_DEBT_P90 AS 'Institution',
 @P90A AS 'Average',
 @P90W AS ' Weighted Average' 
 FROM CollegeInfo
 WHERE INSTNM LIKE'%Alabama A & M%'

Right now it reads as

10%  Debt Level 4750    3530    2816    25%  Debt Level 9500    6243    5990    75%  Debt Level 37900   18543   27976   90%  Debt Level 50114   25147   39153

But it needs to read as

10%  Debt Level 4750    3530    2816    
25%  Debt Level 9500    6243    5990    
75%  Debt Level 37900   18543   27976   
90%  Debt Level 50114   25147   39153

Answer 1

Like this:

SELECT '10%  Debt Level'
     , CUML_DEBT_P10 AS 'Institution'
     , @P10A AS 'Average'
     , @P10W AS ' Weighted Average'
FROM CollegeInfo
WHERE INSTNM LIKE'%Alabama A & M%'

UNION ALL
SELECT'25%  Debt Level', 
     , CUML_DEBT_P25 AS 'Institution'
     , @P25A AS 'Average'
     , @P25W AS ' Weighted Average'
FROM CollegeInfo
WHERE INSTNM LIKE'%Alabama A & M%'

UNION ALL
SELECT '75%  Debt Level'
     , CUML_DEBT_P75 AS 'Institution'
     , @P75A AS 'Average'
     , @P75W AS ' Weighted Average' 
FROM CollegeInfo
WHERE INSTNM LIKE'%Alabama A & M%'

UNION ALL
SELECT '90%  Debt Level'
     , CUML_DEBT_P90 AS 'Institution'
     , @P90A AS 'Average'
     , @P90W AS ' Weighted Average' 
FROM CollegeInfo
WHERE INSTNM LIKE'%Alabama A & M%'

I suppose you could do this as well:

WITH CTE AS (
SELECT  '10%  Debt Level' debtLevel, 
CUML_DEBT_P10 AS 'InstitutionA',
@P10A AS 'AverageA',
@P10W AS [Weighted AverageA] ,
'25%  Debt Level', 
 CUML_DEBT_P25 AS 'InstitutionB',
 @P25A AS 'AverageB',
 @P25W AS [Weighted AverageB] ,  
 '75%  Debt Level', 
 CUML_DEBT_P75 AS 'InstitutionC',
 @P75A AS 'AverageC',
 @P75W AS [Weighted AverageC] ,
 '90%  Debt Level', 
 CUML_DEBT_P90 AS 'InstitutionD',
 @P90A AS 'AverageD',
 @P90W AS [Weighted AverageD] 
 FROM CollegeInfo
 WHERE INSTNM LIKE'%Alabama A & M%')

SELECT B.DL
     , max(CASE WHEN B.DL='10%  Debt Level' THEN CTE.InstitutionA
                WHEN B.DL='25%  Debt Level' THEN CTE.InstitutionB
                WHEN B.DL='75%  Debt Level' THEN CTE.InstitutionC
                WHEN B.DL='90%  Debt Level' THEN CTE.InstitutionD END) as Institution
     , max(CASE WHEN B.DL='10%  Debt Level' THEN CTE.AverageA
                WHEN B.DL='25%  Debt Level' THEN CTE.AverageB
                WHEN B.DL='75%  Debt Level' THEN CTE.AverageC
                WHEN B.DL='90%  Debt Level' THEN CTE.AverageD END) as Average
     , max(CASE WHEN B.DL='10%  Debt Level' THEN CTE.[Weighted AverageA]
                WHEN B.DL='25%  Debt Level' THEN CTE.[Weighted AverageB]
                WHEN B.DL='75%  Debt Level' THEN CTE.[Weighted AverageC]
                WHEN B.DL='90%  Debt Level' THEN CTE.[Weighted AverageD] END) as WeightedAverage 
FROM CTE
CROSS JOIN (SELECT '10%  Debt Level' DL UNION ALL 
            SELECT '25%  Debt Level' UNION ALL
            SELECT '75%  Debt Level' UNION ALL
            SELECT '90%  Debt Level') B
GROUP BY B.DL