Converting comma delimited string to multiple columns in sql server

Question

I want to extract specific strings separated by a comma and parse across the specific columns in SQL server 2008. The table structure in SQL server is as follows:

Answer 1

DECLARE @SAMP TABLE
(
  COMMASEPA VARCHAR(255),
  X VARCHAR(10),
  Y VARCHAR(10),
  Z VARCHAR(10),
  A VARCHAR(10),
  B VARCHAR(10),
  C VARCHAR(10),
  D VARCHAR(10)
)
INSERT INTO @SAMP VALUES
('X=1,Y=2,Z=3',null,null,null,null,null,null,null),
('X=3,Y=4,Z=5,A=6',null,null,null,null,null,null,null),
('X=1,Y=2,Z=3,A=5,B=6,C=7,D=8',null,null,null,null,null,null,null)

update S set
  X = case when P.X > 3 then substring(T.COMMASEPA, P.X, charindex(',', T.COMMASEPA, P.X) - P.X) end,
  Y = case when P.Y > 3 then substring(T.COMMASEPA, P.Y, charindex(',', T.COMMASEPA, P.Y) - P.Y) end,
  Z = case when P.C > 3 then substring(T.COMMASEPA, P.Z, charindex(',', T.COMMASEPA, P.Z) - P.Z) end,
  A = case when P.A > 3 then substring(T.COMMASEPA, P.A, charindex(',', T.COMMASEPA, P.A) - P.A) end,
  B = case when P.B > 3 then substring(T.COMMASEPA, P.B, charindex(',', T.COMMASEPA, P.B) - P.B) end,
  C = case when P.C > 3 then substring(T.COMMASEPA, P.C, charindex(',', T.COMMASEPA, P.C) - P.C) end,
  D = case when P.D > 3 then substring(T.COMMASEPA, P.D, charindex(',', T.COMMASEPA, P.D) - P.D) end
from @SAMP as S
  cross apply (select ','+S.COMMASEPA+',') as T(COMMASEPA)
  cross apply (select charindex(',X=', T.COMMASEPA)+3 as X,
                      charindex(',Y=', T.COMMASEPA)+3 as Y,
                      charindex(',Z=', T.COMMASEPA)+3 as Z,
                      charindex(',A=', T.COMMASEPA)+3 as A,
                      charindex(',B=', T.COMMASEPA)+3 as B,
                      charindex(',C=', T.COMMASEPA)+3 as C,
                      charindex(',D=', T.COMMASEPA)+3 as D) as P