How to separate string based on condition? - sql

Question

COMMSTR1-NAC-NAM-P-C FCPANAM1-NAC-NAM-P-C CHAZEL1-NAT-CBM-P-C
I want to seperate the above string as (Required Output)
col1 col2 col3 col4 col5 col6
COMMSTR1 NAC-NAM-P-C FCPANAM1 NAC-NAM-P-C CHAZEL1 NAT-CBM-P-C
I've tried this.
SELECT Contact_assg_list_src,
Contact_Assg_List_Src =
(
case WHEN Contact_Assg_List_Src IS NOT NULL and Contact_Assg_List_Src <> ''
then left(Contact_Assg_List_Src,patindex('%[-]%',Contact_Assg_List_Src)-1)
ELSE Contact_Assg_List_Src
END),
(case WHEN Contact_Assg_List_Src IS NOT NULL and Contact_Assg_List_Src <> ''
then substring(Contact_Assg_List_Src,(Patindex('%[-]%',Contact_Assg_List_Src + ' ')-1),len(Contact_Assg_List_Src))
ELSE Contact_Assg_List_Src
END)
from dbo.FBMSRAW;
Which gives me output like
col1 col2
COMMSTR1 NAC-NAM-P-C FCPANAM1-NAC-NAM-P-C CHAZEL1-NAT-CBM-P-C
How can I check whether the string has space then separate the string based on that to
get required output?

Answer 1

If you want to do it efficiently in SQL server, I'd advise using a CLR function.
But if you have to do it in T-SQL, this function will achieve it (slowly, and in an increasingly inefficient way)
create function SplitString
(
#splitchar char(1),
#string varchar(500),
#index int
)
returns varchar(500)
as
begin
declare #split int, #start int, #loop bit, #i int, #ret varchar(500)
select #start = 0, #i = 0
select #split = charindex(#splitchar, #string, 0)
if #index>0
select #loop = 1
else
select #loop = 0
while #loop = 1
begin
select #start = #split+1
select #split = charindex(#splitchar, #string, #start+1)
if #split = 0
begin
select #split = len(#string)+1
end
select #i = #i + 1
if #i = #index
begin
select #loop = 0
end
end
if #split>#start
select #ret = substring(#string, #start, #split-#start)
else
select #ret = null
return #ret
end
select dbo.SplitString (' ', 'COMMSTR1-NAC-NAM-P-C FCPANAM1-NAC-NAM-P-C CHAZEL1-NAT-CBM-P-C', [0 based column number])

Answer 2

I have wrote the following script to suit your needs, but your self you need to add some more logic, understand the following script
Create a dummy table
CREATE TABLE TBL_TEMPSTRINGS(STRCOL VARCHAR(200),COL1 VARCHAR(50),
COL2 VARCHAR(50),COL3 VARCHAR(50))
Insert values from your table
INSERT INTO TBL_TEMPSTRINGS
SELECT Contact_assg_list_src From dbo.FBMSRAW
Create a stored procedure to update your dummy table columns, it takes your table name in a string(why you can replace your dummy table with temp table name if you have used)
CREATE PROC SP_SPLITWRODS(#TABLENAME VARCHAR(50),#COLCOUNT INT)
AS
BEGIN
DECLARE #QRY VARCHAR(500)
CREATE TABLE #TBL_TEMP(STRCOL VARCHAR(200))
DECLARE #STRCOL VARCHAR(200)
DECLARE #CURRINDEX INT
DECLARE #TEMP INT
DECLARE #COLINDEX INT
DECLARE #ROWID INT
DECLARE #STRLEN INT
DECLARE #TEMPVALUE VARCHAR(50)
DECLARE #LASTWORD BIT
--CURSOR FOR YOUR TEMP TABLE
DECLARE CUR_TEMP CURSOR LOCAL FOR SELECT STRCOL FROM #TBL_TEMP
--CONSTRUCT QRY FOR FILLING YOUR TABLE
SET #QRY='INSERT INTO #TBL_TEMP SELECT STRCOL FROM ' + #TABLENAME
--FILL TABLE
EXECUTE(#QRY)
OPEN CUR_TEMP
FETCH CUR_TEMP INTO #STRCOL
WHILE ##FETCH_STATUS = 0
BEGIN
SET #CURRINDEX=1
SET #COLINDEX=1
SET #LASTWORD=0
--GET ' ' INDEX
SET #TEMP=CHARINDEX(' ',#STRCOL,#CURRINDEX)
WHILE #TEMP > 0
BEGIN
--YOU WILL GET THE VALUE SEPERATED BY SPACE
SET #TEMPVALUE=SUBSTRING(#STRCOL,#CURRINDEX,#TEMP-#CURRINDEX)
--ADD MORE LOGIC TO UPDATE YOUR COLUMNS (YOUR EXTRA COLUMNS)
--CONTRUCT QRY TO UPDATE CORRESPONDING COL IN YOUR TABLE FOR THE ROW FETCHED
--THIS UPDATES ALL ROWS, YOU NEED TO ADD ONE WHERE CONDITION TO UPDATE THE ROW
SET #QRY='UPDATE ' + #TABLENAME + ' SET COL' + CAST(#COLINDEX AS VARCHAR) + '=''' + #TEMPVALUE + ''''
EXEC(#QRY)
--INCREMENT COL INDEX AFTER UPDATE OF LAST COLUMN
SET #COLINDEX=#COLINDEX+1
SET #CURRINDEX=#TEMP+1
SET #TEMP=CHARINDEX(' ',#STRCOL,#CURRINDEX)
IF #TEMP=0 AND #LASTWORD=0
BEGIN
SET #TEMP=LEN(#STRCOL)+1
SET #LASTWORD=1
END
END
FETCH CUR_TEMP INTO #STRCOL
END
CLOSE CUR_TEMP
DEALLOCATE CUR_TEMP
END
Execute your proc
EXEC SP_SPLITWRODS 'TBL_TEMPSTRINGS',1
See your updated dummy table
SELECT * FROM TBL_TEMPSTRINGS
Presently it is updates 3 columns split by the space, you need to add your own logic to update the columns based on the string you have received(seperated by space).
Hope it helps

Answer 3

First a function to split the text
create function [dbo].[f_split]
(
#param nvarchar(max),
#delimiter char(1)
)
returns #t table (val nvarchar(max), seq int)
as
begin
set #param += #delimiter
;with a as
(
select cast(1 as bigint) f, charindex(#delimiter, #param) t, 1 seq
union all
select t + 1, charindex(#delimiter, #param, t + 1), seq + 1
from a
where charindex(#delimiter, #param, t + 1) > 0
)
insert #t
select substring(#param, f, t - f), seq from a
option (maxrecursion 0)
return
end
go
Query to display the result, assuming there are max 6 'words'
declare #t table(txt nvarchar(500))
insert #t values ('COMMSTR1-NAC-NAM-P-C FCPANAM1-NAC-NAM-P-C CHAZEL1-NAT-CBM-P-C'),
('t1 t2 t3 t4 t5 t6')
select * from #t t
outer apply
(
select max(case when seq = 1 then val end) col1,
max(case when seq = 2 then val end) col2,
max(case when seq = 3 then val end) col3,
max(case when seq = 4 then val end) col4,
max(case when seq = 5 then val end) col5,
max(case when seq = 6 then val end) col6
from dbo.f_split(t.txt, ' ')
) b