SQL Server: Merge two values with regexp - sql

Question

I am using an SQL Server database and have these following tables
Table "Data"
--------------------------------------------------------------------------------------------------|
| Id |col_1_type | col_1_name | col_2_type | col_2_name | col_3_type | col_3_name |
--------------------------------------------------------------------------------------------------|
| 1 |KI | Inflation Rate | KI | Currency Rate | MI | Government Spending |
--------------------------------------------------------------------------------------------------|
And i just want to make my result to be like this:
+----+------------------------+
| Id | results |
+----+------------------------+
| 1 | KI-Inflation Rate |
| 2 | KI-Currency Rate |
| 3 | MI-Government Spending |
+----+------------------------+
The column name is mandatory though, thats what made it complicated i guess?
i know you can merge 2 values or concatenate it, but i'm stuck on the column name such as col_1_name and col_2_type. Do i need to use regexp maybe?

Answer 1

Please try this-
select ROW_NUMBER() OVER (ORDER BY (select null)) id , results
from
(
SELECT CONCAT(col_1_type,'-',col_1_name) results
FROM [Data]
UNION ALL
SELECT CONCAT(col_2_type,'-',col_2_name)
FROM Data
UNION ALL
SELECT CONCAT(col_3_type,'-',col_3_name)
FROM Data
)o
Or this also
SELECT Id,results
FROM Data
CROSS apply
(VALUES (CONCAT(col_1_type,'-',col_1_name),1),(CONCAT(col_2_type,'-',col_2_name),2)
,(CONCAT(col_3_type,'-',col_3_name) ,3) ) cs (results,Id)

Answer 2

I would use of cross apply with the help of CTE and stuff()
;with cte as
(
select a.* from table t
cross apply (
values
(t.col_1_type, 'col_1'),
(t.col_1_name, 'col_1'),
(t.col_2_type, 'col_2'),
(t.col_2_name, 'col_2'),
(t.col_3_type, 'col_3'),
(t.col_3_name, 'col_3')
) a(name, id)
)
select distinct stuff(
(select '-'+name from cte where id= c.id for xml path('')),
1,1, ''
) [Results],
from cte c
EDIT :
Not sure about Id column but my guess that could be resolved by using ranking function
select row_number() over (order by (select 1)) Id,
cc.Results from
(
select distinct stuff(
(select '-'+id from cte where name = c.name for xml path('')),
1,1, ''
) [Results]
from cte c
) cc
Result :
Id Results
1 KI-Currency Rate
2 KI-Inflation Rate
3 MI-Government Spending

Answer 3

Sample data
IF OBJECT_ID('tempdb..#t') iS NOT NULL
DROP TABLE #t
IF OBJECT_ID('dbo.temp','U') iS NOT NULL
DROP TABLE temp
;With CTe(
Id ,col_1_type , col_1_name, col_2_type , col_2_name, col_3_type , col_3_name )
AS
(
SELECT 1,'KI','Inflation Rate','KI','Currency Rate','MI','Government Spending'
)
SELECT * INTO temp FROM CTe
Using Dynamic sql
DECLARE #Sqlstring nvarchar(max)
,#SQlQuery nvarchar(max)
;WITH cte
AS
(
SELECT COLUMN_NAME ,
((ROW_NUMBER()OVER(ORDER BY (SELECT NULL))-1)/2 )+1 AS BatchSeq
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='temp' AND COLUMN_NAME<>'Id'
)
SELECT #Sqlstring=STUFF((SELECT ', '+COLUMN_NAME FROM
(
SELECT DISTINCT '('+STUFF((SELECT ', '+COLUMN_NAME
FROM cte i
WHERE i.BatchSeq=o.BatchSeq FOR XML PATH ('')),1,1,'') +')' AS COLUMN_NAME
FROM cte o
)dt
FOR XML PATH ('')),1,1,'')
SET #SQlQuery='
SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 1)) AS ID,
CONCAT(col_type,''-'',Col_names) AS Result
FROM Temp
CROSS APPLY ( VALUES '+#Sqlstring+') dt(col_type,Col_names)'
PRINT #SQlQuery
EXEC(#SQlQuery)
Result
ID Result
-----------------------
1 KI-Inflation Rate
2 KI-Currency Rate
3 MI-Government Spending

Answer 4

Try like this
select (column1 || ' '|| column2) from table;
or
SELECT tablename.col_1_type + ' ' + tablename.col_1_name AS results;